Fuel Gauge Troubleshooting 101

[@stevew9586]

Probably the best self help video I have ever seen on fuel gauge not working. Awesome.

[@danielschiel7001]

I agree

[@smid2550]

Informative and well presented. It's nice to see a video made by someone on KZbin who actually knows what they're doing -

[@pavoteanomalies7261]

This is the best video of the 4 I've seen on this topic. Fast easy trouble shooting. THANKS!

[@E5Bobby]

Very well done. I've got an issue with a 1948 Chevrolet truck and this video reminded me of how the circuitry is laid out. Very well explained! Thank You!

[@glg3045]

Thanks Ron. Like many below have said, you helped me diagnose a bad fuel guage. New guage is on order ... looking forward to having an operational fuel guage on my boat.

[@jparson3309]

Great video my friend I like the trick of clocking the old sending unit.

[@fishin11]

You found the problem right away. And I will say good video. BUT, retired marine tech here, I would have started at the gauge to make sure gauge is getting keyed power and ground to it. If Good then continue and ground out the gauge right then on the back, if good continue. Now ground out at sender, if gauge doesn’t move wires are bad, if gauge pegs its the sender. Doing it this way you are checking the complete system. What would you have done if the gauge didn’t move when you grounded it at sender, you would have had to do what I just described anyway. Think simple & thorough first.

[@Ketchupbelongsonsteak]

I have tested everything. Gauge with jumper, jumper at sending unit, resistance in sender(new one also) everything checks out. My gauge is full and only moves barely to "more full". I pulled sender slide float and gauge barely moves from full to "more full". What the heck am I missing?

[@johnbravo2315]

The float arm contains metal and may be pulled out of the fuel tank by using a magnet affixed to a clean length of plumbers snake. Never ever leave any object inside the fuel tank which doesn't belong there. Exceptional good video presentation!

[@terrymaret694]

Excellent troubleshooting video...thanks for sharing...saved me a big repair bill.

[@rontanis1024]

Your welcome, just took a break from more filming, we have a rain storm rolling through & it's messing up the audio it's so loud.

[@tacoking657]

Great video. How about video on replacing drive shaft packing for water leaking into ski boat

[@danielschiel7001]

That was a perfect, and easy to understand explanation of the fuel gauge system. Thankyou

[@miguelgonzalez-mz3br]

Thank you for the awesome video I helped diagnose a bad fuel sending unit. God bless you.

[@Smalltechguy]

I sincerely appreciate this video that you had posted. I wish that I had seen this video when I was redoing my sender. I'm helping my friend out now with his Triton boat. He has issues on both ends. I will let him know about your senders. I may even pull mine back out and get the new senders from you. When I short the sender out at the tank, I get no response from the guage. When I'm under the helm, I do get power using my test light. I had to watch your video again to remember how to short out the guage itself..

[@fern9234]

You're a great teacher sir. Very much appreciated. Keep it up!

[@theoracle3747]

Good Job! Very informative and nicely organized. My boat, a 2000 Mastercraft Sportstar, suffers from an intermittent fuel gauge issue - works fine at home, but on the water, it works for a while then goes on and off intermittently. Pretty hard to troubleshoot on the water... Oh, well....

[@rodmir500]

Thank you, this made a lot of since to me. My sending unit is VERY hard to get to and with your advise I marked it before I removed it and I must say that was a life saver!!! The thing has a 5 screw pattern that seems like they would all be the same but mine was not!! I could not believe that that gasket would only fit one pattern, this would have been very difficult to figure out if I had not marked it.

[@ShannonCraig-p5w]

Thanks that video helped and explained lots does needle paint come in different colors

[@eddiesoler4077]

Great video will follow your instructions tomorrow morning.

[@ptrim1902]

Excellent video explanation on the topic. Thank you.

[@luxorbill269]

Very good video, thanks for spending time to show how it works. Bill

[@tonydioso4663]

Thank you for sharing this. It helped me diagnose my fuel gauge problem.

[@rontanis1024]

Your welcome

[@mmllgg2471]

Thanks for the video! It fixed my fuel gauge sending issue! You saved me lots of money.

[@curtissmith4347]

Pp

[@russellhugo6504]

Fantastic video. Presented very well

[@ArchitectureSriLanka]

Very good explanation and excellent work. good video.

[@rontanis1024]

Thanks

[@copokitapo]

Thank you, made troubleshooting my faulty fuel gauge a breeze.

[@DollarTreeFlyer]

Wow you made it very easy to understand, thank you for a great presentation!

[@rontanis1024]

Your welcome, we appreciate the comments...keeps us going!

[@Muzeekworld]

Thanks for a such an imformative post. question... I have a 40 foot 1978 viking style fishing boat and under the boat /Stern there are 4 aluminum gas tanks and wanted to know are the senders always on the very top?

[@watercop5115]

Very very good demo. Bravo.

[@lrepko2]

thanx for a great video very helpful

[@pcb4041]

Awesome content. Great details!!

[@carvalhosilva4018]

Congratulations! Very good explanation. And if problem lies inside the gauge indicator? Can you help with another video?

[@mdinfriscotx]

Great video. Just what I needed. Thank you.

[@Bleemus]

Thank you!

[@joserubi3576]

you did a great job in explaining, wow.

[@CalQwax]

If the sending units are bad/rusted/toast like the one here. How did you know the ohms range needed in the new sending unit? OHMS ranges needed for gauges, from what I am finding, are different and even reversed. Without a good sending unit how did you know which new sending unit you needed? Some read FULL at 10 ohms and some read EMPTY at 10 ohms. I ordered a Resistance Substitution Box tool to feed different resistances to the gauges. Do you have a video on finding out the ohms range of a fuel gauge? "How to buy the right sending unit".

[@rontanis1024]

The required resistance values needed are dictated by the gauge they are used with. A few gauges have the ohm range printed on the backside, most you will have to look up in the respective data sheet for the gauge. Our instructions and applications are for the US manufactured recreation boating community, and the standard ohm range for our fuel gauges is 240-33.

[@tccogsdelljr8230]

Thanks for this video, perfectly explained

[@richestro6642]

Thank you for sharing this. It helped me diagnose my problem.

[@teedee9596]

Excellent video, nicely presented and super informative. Well done and thanks!

[@rontanis1024]

Thanks, your welcome

[@jimw6991]

Forget to mention, really nice job on this video - perfect for a do it yourselfer!

[@Ocalaman]

Thanks Ron for a great video! I subscribed, and plan to buy some needed boat parts from you.

[@rontanis1024]

Thanks for the comments...RonT

[@joseantoniodorosario729]

Thank you Sir.

[@RC-Heli835]

That new fuel send unit was very nice. The fuel pump I just put in my van had the swinging arm and looked very cheap compared to what came out of it. The old one had a swinging arm too but the wiper and wiper pad were built way better on the old one. Can electronic oil pressure gauges be tested the same way?

[@rontanis1024]

If it's a single wire sender, YES, if it's a 2 or 3 wire sender NO

[@jeremykoehler8048]

Thank you Ron, this has been very informative. I have been using it to troubleshoot my "always full" gauge on a boat I just got. Tested sender for Ohm range=good. I remove sender pink wire from post on sending unit abd needle drops, touch mounting flange and all the way past full. Ground wire is hooked to mounting screw. I've tested voltage at sender and gave and get same reading. Idea's?

[@privateer4203]

Nicely done. Thank you.

[@jimgreer5947]

Excellent video!! Well done.

[@adriangartland2533]

Great video. Do you have a similar video for Mastercraft 3 wire sender?

[@henryramirez5582]

Omg thank you sir you are the best

[@sparky7146]

Well done video. Thanks.

[@fern9234]

I have a black wire and a pink wire at the sender instead of what your sender looks like. Do I jump them to do the first part of the check to see if the wires and gauge are working?

[@frametech9]

explained very well, sorted my problem many thanks

[@joelpenajr908]

Ron, I hv an 11in tank on a 2006 Yamaha Vmaxx 150hp. Are Moeller sending units universal by tank depth or do I specifically need to order by brand, hp, year?

[@islandmarchingarts988]

My gauge always shows full or almost full. I pulled the sending unit out and tested it. Seemed to be working fine on ohm meter (between 30ish ohms with the slider all the way up and and 290ish ohms with the slider all the way down). When hooked up to the gauge I can see the needle moving as I move the slider up and down, it's just not moving very far. Is this more than likely a bad gauge or a problem with wiring?

[@rontanis1024]

More than likely the gauge, but I would ground the back of the gauge "S" terminal (pink wire) to the ground and the needle should swing to Max, disconnect the pink wire from the gauge & it should go to E

[@neon1929]

Is the new style sending unit more accurate. Mine works, but the reading is wonky b/c the gas sloshes around so much. Any suggestions for getting an accurate reading at the fuel gauge?

[@danielgrenier2417]

Great tutoring on how to troubleshoot these issues. However, how would you proceed with an incorrect reading from a gauge? Meaning, my fuel gauge shows about 3\4 when the tank is full and shows about 1\8 when boat is off. Accuracy is way off. Gauge? Sender? Both?

[@niratocco4709]

My gauge is in a very tight space and my sending unit is INCREDIBLY hard to get at, so I ask this - my gauge is always pinned on full. Does this mean that my gauge is good and the problem is definitely in the sender? TIA. PS: great vid, thanks.

[@rontanis3732]

Unless you disconnect the sender wire from the sender you won't know, if disconnected & the gauge goes to E or below it will be the sender or the sender wire is grounded somewhere, but usually it would be the sender then.

[@joelpenajr908]

Ron, when u do the needle swing test at the gauge using a jumper between the ground and the S terminal, is the ignition switch on?

[@rontanis1024]

YES

[@joelpenajr908]

@@rontanis1024 Thanx!

[@derrickaustin8273]

Thx, found out it was my faulty ground wire. thx

[@jimw6991]

Hi Ron, I have a 1996 Malibu Sunsetter and want to change the sender unit to the "reed style". I am guessing they are standard size, do you have a part number or set if them for various dimension tanks? Also need to replace light bulb in my gages, they are original equipment in boat and are teleflex (black background with white lettering). Do you know part number for them, I would like to order. Last question, fuel hose running from tank to fuel water separator ... is it special or will automotive fuel hose work? Engine is 5.7 L Mercruiser.

[@rontanis1024]

They are not standard size, you will need to measure the depth of your tank to determine which sender you need. If your bulbs are removable try the local auto parts store for bulbs, fuel hose for marine applications is specific, must have the USCG numbers with E-15 on it for ethanol fuels: skiboatpartsonline.com/Inboard-Ski-Boat-Parts/hose/hose-fuel-3-8.html

[@jeffadams4487]

Great video. What if when you turn on your ignition your fuel gauge pegs out to full and never moves?

[@rontanis1024]

disconnect the pink wire at the fuel tank sender & try it again, if the gauge stays at E now with the switch on you have a bad sender.

[@jeffadams4487]

@@rontanis1024 awesome, thanks for your reply. I'll give it a try and let you know.

[@jeffadams4487]

The electrical connections on top of my fuel tank are sealed. Any ideas on how to deal with that?

[@rontanis1024]

@@jeffadams4487 If it's a 3 wire sender like MasterCraft uses this video will not apply to that type. If there are 2 wires coming from the sender there must be a wire plug or wire splice near the sender, you would need to break that connection to test the sender.

[@jeffadams4487]

@@rontanis1024 I wish I could send a photo of my connection but I guess it is not supported. It is a 2 wire connection on a Bennington. My plan is to replace the sensor.

[@JDWard-Jeepster]

If your sending unit is bad how do you know if you need a 230 - 33 OHM or a 0 - 190 OHM sender? Most people don't want to buy one of each to make sure they get the right one.

[@rontanis1024]

All of the US Marine senders I see are 230-33 ohm, (230 empoty-33 full) Europeans use some 33-230 ohm (backwards, and automotive use 0-190 and other scales, Mastercraft uses some variable voltage senders, not variable resistance (they use a 3 wire sender)

[@barrybebenek8691]

Thank you so much! This is the most clearly explained way of checking the system top to bottom. 👍🏼🇨🇦 Question: what if my gauge on my 2011 stingray 185, can read half-full in one moment, then drop to empty the next, and all points in between? Is the sender more likely?

[@rontanis1024]

Senders react & report instantly, a tank that sloshes fuel a lot will cause a sender to do this, many fuel gauges however have electronic circuits that "dampen" the signals to make a more stabil reading. To determine the gauge/sender, remove the sender & while it is wired up move the float up & down & watch the gauge they should work in harmony.

[@barrybebenek8691]

Ron Tanis Thank you, once again. 👍🏼🇨🇦

[@SparrowJacksonAirsoft]

So what happens when I replaced my fuel sender, and the gauge works, but it constantly reads "full" when I know it's not? The swing arm is set for the tank depth and it's not blocked, swings freely.

[@marksaint-louis3246]

I am having the same problem. It reads a just over 1/2 a tank when I bought the boat and after I replaced the sending unit with a universal one. Still the same problem.

[@hasch2422]

When ignition is on my Guage reads full, though I had the sender replaced by a mechanic (19 year old boat). I did the testing mentioned under Dave Nathe i.e., “Disconnect the pink wire from the back of the gauge & turn the key on”, mine stays on "E". I then reconnected the pink to the guage & disconnected the pink at the sender, re-tested , and the gauge stayed on "E". Does this mean the guage is bad?

[@rontanis1024]

Yes

[@hasch2422]

@@rontanis1024 Thank you big time!! I replaced the gas Gauge yesterday and all is working! It's a major headache not to know your gas supply!

[@tonyribeiro3856]

I have a 1994 base Mustang that has no LOW FUEL LIGHT. Is there something that could be done to add this control?

[@rontanis1024]

What kind of boat is this???

[@brettroelofsz6456]

Hi there Ron, I have put a reid switch style fuel sending unit in my Sierra Supreme ‘89. However when I turn the boat on, the gauge works in reverse (I.e. my boat shows Empty when it’s full and Full when the tank is empty. Can you advise what the cause could be. Thanks 🇿🇦

[@rontanis1024]

WHere are you, and where did you get the sender, we sell these but in the American calibration, the European calibration is reverse of the American, sounds like you have a european cal sender for an american gauge.

[@taitsianguaqolsen1804]

great video, very informative. thumbs up :-)

[@jon964]

When I turn the key, the fuel gauge shows full, when I turn the ignition off, it shows empty. Tested sensor with measuring instrument it has the correct Ohm value. It is both a wema and a wema instrument. Has worked before and also not replaced anything previously. When I disconnect the sensor's 2 cables it still shows full. what do you think is wrong then?

[@rontanis1024]

You didn't say where the float position was but note that there are marine versions and automotive versions of senders & gauges, USA Marine is 33-240 ohms with 33 as full and 240 as empty, european & many auto are reversed from this. Wema makes both.

[@howardsparger2947]

When I ground from send to ground the gage goes to full but very slowly. Does that indicate a bad gage?

[@rontanis1024]

No, that means your gauge has electronic "dampening" in it's circuitry - a good thing- stabilize's the gauge reading

[@linopacheco9124]

What a good video. Thanks!

[@peterjosephsmith7464]

Great video. Gage goes all way past full when shorted. Thought my problem was sender so I pulled it. It is a reed style sender. Moved the ring up and down and the gauge does move. Problem is with the ring all the way to the top (full) gauge shows past full but move the ring to the bottom (empty) and the gauge only goes to about 7/8 full. Help please?

[@peterjosephsmith7464]

I measured the resistance on the sender. Ring at the top is about 30 ohms. Ring at the bottom is about 200 ohms.

[@rontanis1024]

@@peterjosephsmith7464 33-240 is the std. American Sender values, 200 should show around 1/8 tank, I suspect your gauge is bad.

[@peterjosephsmith7464]

@@rontanis1024 Thanks for the come-back. Gauge is mounted in a dash. Combined volts and fuel. If I send you a picture can you tell me what new gauge I need? It is 2016 Starcraft Fishmaster..

[@rontanis1024]

@@peterjosephsmith7464 Multi-gauges are usually made specifically for a boat builder, and may not be available once the boat builder moves on to another style. Send the pic & I will look at it.

[@peterjosephsmith7464]

Gauge is 3 3/4 OD, 3 1/4 cutout. #781520PMFB. I found a Teleflex gage that looks similar but number 781480PMFB. I cannot figure how to send a pic here. Let me see about facebook...

[@JB_Machine]

How does this work with 3 wires at sender? I have the pink going to the big nut in the middle, then a black wire that is a push terminal and another black wire that is connected to one of the sender mounting bolts. My gauge reads empty.

[@rontanis1024]

The blacks are both grounds, touch a temp. jumper between the pink & ground while someone watches the gauge, if the gauge moves to full when jumped the sender is bad, if not repeat the test at the back of the gauge if it's a conventional gauge, it still nothing the gauge is bad assuming the gauge is getting 12V + at the power terminal & 12V- at the ground terminal.

[@JB_Machine]

@@rontanis1024 put jumper from pink to ground and gauge went to full. Pulled sender out and replaced with a reed sender. Wired pink to white on sender, black to black on sender and the other black to mounting bolt on sender, still reading empty. There is power to the purple ignition wire and pink wire on gauge.

[@rontanis1024]

@@JB_Machine call me when you have a chance 985-542-4336

[@jeremycrase3166]

How would you check this for the 3 wire mastercraft?

[@rontanis1024]

You CANNOT use this proceedure for the 3 wire MC senders, traditional. common senders use a variable resistance to ground, the MC sender use a variable voltage usually 1-5 volts, grounding the 3 wire sender will cause damage. You would need to know the senders voltage range to begin working on this.

[@JoseReyes-wo2lm]

( what happens when your guage reads only half than back to empty, as you use it , it travel back to half than to empty, --- empty half full, than back to empty. Half travel only? )

[@rontanis1024]

check the sender

[@Superjetjim]

Brilliant video thanks a bunch 😎👌🏻

[@rontanis1024]

Thanks

[@Lakanuki]

Would this work for a Yamaha digital fuel gauge as well??

[@rontanis1024]

Doubtful, most electronic modern gauges system use variable voltage senders (3 wires) but if it is a 1 or 2 wire sender then yes it would

[@donnlowe9129]

Very helpful thank you.

[@rontanis1024]

Your Welcome, hope it helped solve your problem...RonT

[@donnlowe9129]

@@rontanis1024 It will help when warm weather comes and I can get to working on my hot rod that I have a fuel gauge problem with.

[@robertjohnson957]

Very helpful thank you very much!

[@timothyfennessee8965]

I bought this R72 Ranger boat 12-21-21. The gauge reads half full when it’s actually empty. And when it’s 3/4 full on the gauge it’s actually 1/4 tank full and so on. When I fill up the tank the gauge needle goes way pass the F. And stays there until some of the gas is used up, then the needle will start moving. Basically it seems some is not calibrated right Help Please Thanks What could be the problem?

[@rontanis1024]

Remove the sender & move the sender up & down with the key on and watch the gauge, if it is good outside the tank, look for anything preventing the movement inside the tank, if it acts wrong outside the tank, replace the sender. (Assuming you have a std marine fuel gauge in the dash & not an automotive calibrated gauge)

[@timothyfennessee8965]

@@rontanis1024 ok Thanks, it’s a standard (original) fuel gauge. It does have a 2014 mercury pro xs 115 on it. If that makes any difference. THANKS FOR YOUR HELP!!

[@504ghost504]

My gauge is about a quarter of a tank off but otherwise works any ideas and is it worth time and money to fix

[@rontanis1024]

The only way to troubleshoot this is to remove the sender and manually manipulate it and see what the gauge is doing, all the way up should be full. all the way down -empty, half way up -half. If this is a swing arm style you will need to see if the float is hitting something.

[@Intoxacajun]

Very helpful, did all works but when tank is full gauge only goes to a little over 3/4. But when I short the gauge it shows full. Anyone has any suggestions?

[@rontanis1024]

Now you need to get a bit more "technical" American Marine fuel senders operate on a 33-240 ohm range, 33 is close to (0) which is what we do when grounding the sender. You will need to use an ohmmeter to measure the resistance from the gauge (disconnected wire) to the tank & back & with a full tank you should see 30-38 ohms resistance, if you do the gauge is bad, if the resistance is around 40-60 with a full tank then you likely have a wire or connection between the gauge & sender that is corroded adding resistance to the circuit. You can also run a temp jumper wire between the gauge & sender. Last possibility is a sender float getting stuck on something preventing it from going all the way up....RonT

[@Intoxacajun]

@@rontanis1024 Thanks, checked disconnected wire at gauge and it was 60.

[@jimraleigh5607]

My warning light is staying on with my fuel gauge what would be causing this

[@krishall3187]

Can you re commend me a gage that doest ask so quickly?

[@leebeck7323]

What if when you turn on ignition and gauge bounce back and fourth

[@carlsartin2992]

Can you tell me what to do if you jump the neg to center post and you get nothing

[@rontanis1024]

re-test at the back of the gauge, with key on run a jumper from a good ground to the pink wire on the back of the gauge, if the gauge responds to Full, then you have a bad wire/connections between the gauge & sender.

[@carlsartin2992]

@@rontanis1024 thanks for your help

[@casycasy5199]

what if you get the needle to go over the full mark when you turn the key on and when its off it goes to e.does that mean i have a short in my wiring

[@rontanis1024]

Disconnect the pink wire at the sender, turn the key on, if the gauge reads full youi have wireing or gauge issue, now disconnect the pink from the back side of the gauge & turn the key on if the gauge goes to full you have a gauge problem, if the gauge stays still you have a wire issue.

[@casycasy5199]

@@rontanis1024 thanks for the help

[@WilliamBruceMcFarlane]

my fuel gauge swings to " E " when i turn the ignition on.. any ideas?

[@rontanis3732]

Add gas. If you doubt your gauge follow the steps outlined in the video to troubleshoot the problem.

[@frankdavidson9675]

reed switch is way to go on senders

[@theoldshooter9011]

I've got a 2019 Crest 220SLC pontoon boat. I will fill the gas tank up and the guage will read full as suppose to do. However, after 4 hours of running the motor it will still show full having not moved at all. If I loosen the gas cap for a minute, put it back on, then the needle will move but still not read very accurately in my book. Is it a guage problem or some kind of venting problem????

[@rontanis1024]

Tank venting & new EPA tank tank plumbing should not affect a sender, if this is a plastic tank, can you see through the plastic to see the true level, if so, fill it, make note, run till 1/2 full make a note of the gauge, and if reading full with a 1/2 tank report this to the selling dealer as a warranty issue

[@theoldshooter9011]

@@rontanis1024 Hi Ron...I really wish I could see through the tank but not the least bit translusent. And as for going back to the dealer...that's not happening. Don't trust him. The plan is to drive where ever we are going boating and BEFORE I launch open the gas cap and let it vest and see If that solves the problem. Thatvworks after motoring a while so maybe it will work right off the bat. I've tried contacting Crest HQ but they just don't care ...have yet to answer. Not impressed with the company or their reps at all.

[@HabitatDave]

My guage when turn on the key goes to full and always stays in that position, boat is Alumacraft 175 Competitor, please advise. Plan to get a another sender, so if sender after open floor can replace. Is there a method to know if gauge issue without access to sender?

[@rontanis1024]

Disconnect the pink wire from the back of the gauge & turn the key on, if the gauge swings to Full, gauge is bad, if it stays "E" then reconnect the pink & disconnect the pink at the sender, re-test, if the gauge now pegs over you have a short to ground between the pink wires & ground between the gauge & tank sender.

[@vanaden7114]

You need to check your clock too, it;s struck at 3.00 ever since you started working !!

[@rontanis1024]

Your right, the clock & tach are out, a New TRD Gauge kit will be going in soon.

[@billwilliams6338]

RON TANIS ^^ === I disconnected the Temperature sending unit/temp sense, so How can I test the instrumentation temp gauge in my cars dash board by itself to check if its working correctly, what do I need to do?

[@rontanis1024]

Are you working on a car or boat???

[@billwilliams6338]

@@rontanis1024 ford 1997 mustang 6 cylinder But in general for ALL cars in 60's, 70s, 80's ,90's how can I test the gauge clusters gauges one by one?

[@billwilliams6338]

@@rontanis1024 1.) The Temperature gauge needs a "resistance value" or a Voltage? to be applied to the temperature gauge to see the needle moving from C to F? When I disconnect the temperature sending unit/temperature sensor can't I just use a variable resistor potentiometer and watch the temp gauge need moving from C to F? 2.) The Universal Radiator Pressure tester won't test how much pressure the closed loop system PSI level is at while the car is idling and running. I'm looking for a Pressure tester that can test the PSI level while the car is idling and running to know if the PSI pressure level is at normal operating PSI pressure level of the coolant closed loop system. What is the normal operating PSI pressure level on most cars?

[@rontanis1024]

@@billwilliams6338 Older cars before engines computers did use variable resistance senders, so yes your variable resistor pot would test these, I have a similar set up for testing marine gauges.

[@billwilliams6338]

@@rontanis1024 yes the temp sending unit/temp sensor is a thermistor which is a variable resistance But i dont' know what my temperature gauge is wanting a resistance and a voltage or just only a resistance in order to move that temp gauge needle from C to F?

[@russellkamp8923]

Will your sending units work on a bass boat?

[@rontanis1024]

YES, we only run into issues with European boats, they run reverse calibrations, and auto applications, these are applicable for all US marine applications.

[@angelcitytowing2159]

What if your gas tank had less depth hope do you adjust the new unit

[@rontanis1024]

Reed Switch senders are NOT adjustable, you order the proper length sender. The sender must not touch the bottom of the tank

[@rontanis1024]

Reed switch senders are not adjustable, you need to order the correct length for the tank, I like to see 1/4" clearance between the sender and tank bottom.

[@yasmanysc]

What about if it stay in the 1/2 way don't return

[@rontanis1024]

remove the sender from the tank, wire it up & move the swing arm or float up & down while watching the gauge, if the gauge stops at 1/2 then short the pink & black at the sender & the gauge- if it pegs the gauge Full replace the sender, if it sticks at 1/2 replace the gauge.

[@lil-link]

It is a possibility that you ripped the swing arm while pulling the sender unit from the tank. Also, you should pull out the old swing arm since the float makes the thing.. yeah, float.. It could possibly cause faulty readings if the old swing arm gets "tangled" in the new one.

[@rontanis1024]

It's uncommon to pull a partial float assembly out, which is why we generally remove the tank turn it upside down & shake all the loose parts out.

[@wickedfifth]

Don’t loose the little screws!

[@donnlowe9129]

Couldn't that swing arm be fished out of the tank with a telescoping magnet ?

[@rontanis1024]

Steel ones can but I can't find my aluminum magnate...think my boys borrowed it.

[@joeross952]

Changed my sender. Gauge still reads full all the time.

[@rontanis1024]

Call me when you get a chance 985-542-4336

[@rontanis1024]

Feel free to call me to help diagnose your problem at 985-542-4336

[@shanewhittier7438]

Ron Tanis I’ve done every test, my gauge never leaves 3/4 of the way full, never moves at all. I get 11.5 volts at the gauge, a little low. It’s a multi gauge system from faria that’s discontinued so it doesn’t appear to be an easy swap as I’m not sure they make any the same size any more. Note that it appears non of the gauges work (volt and rpm also but I need to crank it to really check the rpm but it’s too late at night). So I’m pretty darn certain it’s the whole gauge system but would hate it if it wasn’t grounded or something. I changed the sending unit by thebway

[@lyleaustill2274]

my fuel tank will be full but my gauge will only read one half tank

[@highkey386]

Bad ground at guage

[@marscobras8281]

much apresh