GM Fuel Pump Relay Testing

The vehicle being tested is a 1999 Chevy Suburban with no fuel pressure. This truck had a new fuel pump installed and still did not have fuel pressure. In this video I will show you how to troubleshoot this entire fuel pump electrical system, including the fuel pump relay, wiring and computer.
Engine Performance Diagnostics chapter 3 page 26
Symptoms
- no start with good spark
- no fuel pressure
- no trouble codes
Fix
- repair wiring to the fuel (new pump was wired backwards
Tests shown
- how to test a fuel pump relay in a power distribution box.
- power side switched circuit design description and operation.
- Fuel pump power and ground testing.
- how to manually jump a fuel pump from the fuse box
- how to test a fuel pump relay
- relay pins (what each one does and how to test them)
- how to verify computer control of the fuel pump relay
- bias voltage (what is it, how to use it, how it can cause misdiagnosis when using a voltmeter)
- wiring diagram review of a fuel pump relay circuit in my classroom (a ScannerDanner premium segment)
- how to measure fuel pump current
- what sets a fuel pump relay control trouble code
Tools used
- ATD Tools 5519 Auto Ranging Digital Multimeter
www.jbtoolsales.com/atd-tools...
- incandescent test light www.jbtoolsales.com/otc-3633-...
- backprobing pins AES' Electronics Accupuncture Probes www.aeswave.com/cart.php?m=aff...
Playlist
- (Chapters 14, 15,16) Fuel Delivery and Fuel Pressure Testing
• (Chapters 14, 15,16) F...
Related videos
- Fuel Pump Electrical Circuits Description and Operation
• Fuel Pump Electrical C...
- Fuel Pump Relay Problem
• Fuel Pump Relay Problem
- How to test and fix a PGM-FI main relay on a Honda, Acura
• How to test and fix a ...
- How to test an electric fuel pump (1997 4.3L Chevy Blazer CPI)
• Fuel psi less than 50 ...
- Fuel pump electrical circuit diagnosis (no fuel pressure testing) GM
• Fuel pump electrical c...
For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

[@manelishi13]

You answered my question before I could ask and yes I'm subscribed to SD prienun . Learning your insight and methods I was instantly going to say, would it light a 2 ohm bulb if you found 12v on an unkugged sensor. No it would not. Anyone watching Paul's free vids, do yourself a favor and subscribe. He's just teasing you with the free ones and giving you insight. The forum is amazing, the new video player is awesome and Paul does respond to any questions . Best money I spend every month even though I've completed the course. Always something new and always there for a refresher. Oh and keep his book In your toolbox!

[@ScannerDanner]

Thank you so much for this comment my friend and for your long time support

[@j81851]

sinking or open collector transistor. Used widely in industrial control, jumped the fence at GM and invaded our cars when computers became standard. Coil load tells the computer there is a load there. When the transistor is told to turn on by the computer it SINKS to ground and loads up passing voltage! The test light acts as he said just as the relay coil would. 42 years of electrical and the last 16 in training others one of the best descriptions of sinking and open collector I ever saw. Awesome!

[@ScannerDanner]

+John Goodman thanks for the comment! Feel free to keep going! I've never heard the terms "sinking or open collector". I only know this from a mechanic standpoint. If I could clone myself, I would go back to school for electronic engineering. Love hearing from guys like you

[@xtilt11]

2004 GMC Savana 3500 cutaway, with a 15' box. No start, no pressure. Was able to jump the correct pins (you explained very well) and send constant power to the pump to investigate further. Found out to be a bad connection w/ the connector at the pump. Would have never stumbled across it without your information. Was sending it to the shop tomorrow....Great work and fantastic information!

[@paulmac3307]

Paul, I've immersed myself in *your videos cam/crank sensors, Hall effect pull up/dn testing, mostly in troubleshooting an 01 I30 no start for weeks and you've impressed me to no end. But **this lesson here has inspired me so much so that I *had to write to commend you on your style, brilliance, tenacity and skill! Even more thank you for your technique in imparting knowledge to the layman now so rarely found I'm sure. I'm an FAA Certificated Airframe & Powerplant Mechanic since 16 years old (63 now,) Commercial Pilot and Instructor since 1974 and tow truck driver shade tree automotive wrench too, admittedly **not even close to your realm - Learjets vs. Maserati = two different beasts. But where does one start explaining your passion? Brilliant teaching technique? Abundant resource of the mind? Vast stores of vital bits of info that just... I mean... and you produce smooth relevant attractive media seeming to come from out of nowhere like this: Pwd Side Circ Bias Vltg and backprobing IR drop right **there in the trenches with simple test light and VOM!!!??? And for free???!! I mean you are so cool - meticulous white board drawings, manuals books, well I just wanted to say thank you for being so kind to us out here. Your students I hope will be touching my vehicles out here and you've restored my confidence raising my opinion of auto wrenches in general. I hope they appreciate your stern yet friendly demeanor, temperance, ethical mentorship and carry your legacy paying it forward and so on for quite some time. There will never be another sage like you, and at such a young age. Amazing. Thank you! Paul The Pilot, San Diego

[@MyStone88]

I took 3 years of automotive classes in high school. I now sit in front of a monitor 10 hours a day for a living but never lost my love in fixing cars. This one of the best or the best instructional video on one topic. It's direct and no nonsense instructions and disruptive background music. Excellent continuing education program.

[@williamfolk5878]

Great example of why when diagnosing an electrical issue a test light and a meter should be used when trouble shooting. Thanks for the video,very informative!

[@guardiansunite5013]

The effort you put in to this video and your teaching skills are amazing. Thank you very much for doing this.

[@jeffmosier3145]

You know bud there can be to top lefts etc. Who's view? Where you standing? A fukd mess off the git.

[@alexandertrossen5561]

Who is this guy!? Great instructor and definitely a passionate person. Thanks Scanner Dan, you saved me some money on my diagnostic and I learned something really cool.

[@ScannerDanner]

Thanks so much! My name is Paul Danner and I am an instructor at Rosedale Technical College in Pittsburgh PA

[@brock2872]

ScannerDanner help please

[@randyfrazier5725]

Poor guy had no business rewiring the pump. We have a saying in the Electrical trade that comes to mind. It goes like this: "1 wire hook up, 2 wire f*** up, 3 wire drag up!" Awesome job Scanner Danner.

[@memo03leo]

Thank You for your time in instructing us on how to diagnose a fuel problem !!

[@ScannerDanner]

thank you so much! what a great comment. this bias voltage is cool when you know how to use it. it is a major time saver for troubleshooting wiring problems for sure. nice to know that you appreciate the material

[@zimgir79]

Great job on describing the bias voltage! You took something that could be extremely confusing and made it fairly simple.

[@ScannerDanner]

Thank you!

[@KennyDPhotography]

I appreciate the attention to detail and troubleshooting analysis. I'll definitely be checking out more of your videos.

[@MojoPup]

ScannerDanner, thanks for a GREAT video! I appreciate the detailed explanations and diagrams. I work in the medical device field as an Electronic Tech and I've been doing my own auto electrical for 3+ decades, but I still learn new things from your videos that have puzzled me. Looking forward to getting your book.

[@ScannerDanner]

Thanks so much!

[@dirtyboy8336]

I'm Learning So Much from This guy I just Need Tools To Get Me Started on Working On My Own Car. Thanks for All The Good Knowledge☺

[@35rem80]

We bought our truck used and have this exact wiring mess. Thank you so much for this video brother. It helped and helped a lot!

[@johnchristopherson2718]

Awesome!!!!! I have been in the automotive repair industry since 1983 as a tech and as an instructor, you did a very good explanation of the bias voltage.

[@ScannerDanner]

Thank you John!

[@kristiejobe3823]

ScannerDanner

[@kristiejobe3823]

ScannerDanner

[@tabathalightner9659]

Thabk you Idaho

[@tabathalightner9659]

I h axes ve been working with this shocks since 2008 or 9

[@USAPatriotMan]

This is what real troubleshooting looks like! Great job!

[@Bewildermint]

High praise for this video! Danner is thorough and provides all the necessary background to understand what's going on. Great diagnostic technique. Very professional! Thanks.

[@PUNTO8SERVICE]

GOT TO SAY YOU ARE A GREAT TEACHER AND I HOPE YOUR STUDENTS ARE VERY HAPPY HAVING YOU THERE WITH THEM GOOD LUCK AND GOD BLESS YOU !!!

[@glendayle]

Thanks for this video. I'm just a home wrench turner. I've run into this situation before and have in the past preferred to use my volt meter over a test light for this sort of thing. Now I understand some limitations I did not understand previously. Thumbs up!!!

[@WallaceRoseVincent]

Great video! I am an electrical engineer and you explained the bias circuit well. I think you can say the 12 volts is across the high ohm internal resistor and your test light has very little resistance and can not create an voltage drop (no load). That's why you see zero volts with the test light. Freaking outstanding explanation of the fuel pump circuit!

[@jeremyshanks6937]

Great video. I like the comment on the lean pop through the intake at snap throttle. I have been using these videos to troubleshoot electric fuel pumps measuring current and the armature waveforms. These videos have been very useful. Thanks.

[@mikechiodetti6737]

Having the test light and/or the current meter connected are great tools working together when locating an intermittent pump or current feed problem. I connected a set up like that and monitored them while driving an E350 6.8L V10. The problem was the fused power pin at the Inertia Switch had got hot, lost it's spring integrity, which caused it to lose contact with the Inertia switch. Replaced the pigtail, problem solved. Another tech had replaced the fuel pump AND the fuel pump relay. He didn't know the connector at the Inertia Switch had got hot/overheated. It took a while, I finally found it. Problem solved. Good Video! Didn't know about the bias voltage in that GM circuit.

[@samspade8612]

Outstanding video, my 99 Suburban wouldn't start after a long drive. It finally started but I'm going to do the checks thanks to your video. Much appreciated.

[@matyAnonymuS]

Thanks for the reply! I asked my mechanic; The dist cap and ignition components have been checked, its all good. The whole distributor is 18 months old. The fuel pressure is 57 both when cranking and idling. The fuel pump has unusual sound, wich changes when banging on the tank.

[@rolandwilt2848]

I thank God and Your Video,My c2500 suburban 7.4 2wd runs again,I too who does his own repairs was trying to consider a local shop!

[@pabloarevalodelaguila8767]

Que buen diagnostico, es impresionante lo que usted hace con los vehículos. Felicitaciones.

[@moosemcguirk1640]

Fantastic troubleshooting! I’m pretty sure It’s going to fix my problem where the previous owner bypassed the relay to make a pump run continuously Instead of diagnosing

[@Boatyarddog]

A great teacher, reminds me of my school boy days at Denver Automotive and Diesel College, I am old school. Thanks Dan! keep on teaching the youngers.

[@grantlarmstrong]

What a great video and great explanation. Having some electrical background helps too. It definitely helps why one reads voltage during troubleshooting when you wouldn't expect to.

[@halomotto7158]

Thanks ScannerDanner ! I am really enjoying and learning much from your straight forward videos.

[@rogernegrete8376]

Your a good teacher,you get off teaching,if one would listen to your video 10 times it would just click just like that little piece of plastic your working on when you turn on the key a flow of electric current reaches Transistor and it clicks, sending that current in a controlled flo To open the pump which pumps Fuel to whatever system You have.

[@cockasorrus7475]

WOW!! Just learned a WHOLE bunch of excellent info. watching your awesomely produced video! Just a fantastic job on every level! Thank YOU!!

[@danielmaher7294]

Dan, you are awesome! Excellent teacher. I have fixed two of my Chevy truck's watching your videos and felt confident because it makes sense in my mind. Thank you so much!

[@ScannerDanner]

Thank you! My name is Paul Danner btw 😉

[@mrexecutive1]

ScannerDanner is the Master of Electrical Circuits, Wow! keep these case studys coming!

[@rebelyell4679]

The Oil pressure sensor is also a source of power for the fuel pump, while the engine is running. This is done to keep you going in case of a fuel pump relay failure, once you turn the engine off, no oil pressure, no power to the fuel pump from that source!

[@pitchforkpeasant6219]

If theres an issue with the fuel pump like maybe a short is there the possibility of the oil pressure gauge reading near max? Ive heard that extra “symptom “ with a fuel pump problem

[@pitchforkpeasant6219]

Curious at this point if that union would shut off the fuel pump if the ecm read no oil pressure coming from the oil pressure sensor. Thinking im gonna test that theory. Pull the oil pressure sensor and ground on engine and plug the hole. See if vehicle runs

[@Itsjustpap_]

@@pitchforkpeasant6219how did it go? I’m having the same issue

[@steveberliner774]

EXCELLENT JOB !!! great teacher -- well spoken -- complete

[@ScannerDanner]

thank you Steve

[@Micromaster333]

Thank you you don't know how much you help me right now to learn how to figure this out I really appreciate it fella

[@ventureelect]

Always look forward to seeing your videos. Great stuff Dan , thanks.

[@RdustinJ]

Thanks for the help. changed fuel pump, strainer, and fuel filter. starts right up every time!!!!!!

[@AlfredoGarcia-ej9rp]

So glad i came across this video . Subscribed right away , the way you explain stuff and the education you give is so good. A lot of info but very clear 👌 👏 thank you

[@ScannerDanner]

Awesome, thank you! Really appreciate having you on board and I look forward to hearing from you some more.

[@johnerazo2233]

Thank you !!! Good teaching the way a teacher should teach 💪🏽🙌🏼🥇 . Keep up the good work

[@VIPReefAquariums]

I wish you were in my neck of the woods sir! Awesome mechanic!

[@billrimmer5596]

This is why I have Scanner Danner premium on his website. Even if he never makes another video, how can u thank him for the humongous library chocked full of instructional material. I have watched this video several times. But now I have an 01 GMC 4.8 in the shop. And that bias voltage will help me identify control pins. GM relays will plug in both ways and that throws me off. Thank u Paul!!

[@danielgukushu7958]

Bill Rimmer

[@TheCoatneyadkins]

Even if they plug in both ways it's still the same in the box. ...

[@alexisfrancisco1491]

This guy is good. he is very informative even when its technical, I somehow understood even when Im just laymen. I open this video because my hyundai starex 1999 wont start and I suspected on fuel pump failure cause I run low on diesel the other night. Im changing my glow plugs first since I did not have the pressure of my fuel pump tested yet.. I had a good education here. Hope we'll have more of this helpful videos. Kudos. God bless you.

[@yonivazquez8614]

Thank you, Danner for all your videos.

[@dariomendoza6892]

awsome video sir i have never messed much with electricty but watching this video Inspired me to try to { tackle my no power to the fuel pump relay wire } on my car!!

[@ScannerDanner]

you need more guidance we can help you on my forum www.scannerdanner.com, it is free to join, hope to see you there!

[@needachan]

I really enjoyed this video. it was very helpful now i know where to look at for the fuel relay. Thanks again

[@ScannerDanner]

@PUNTO8SERVICE thank you so much for your kind words. and may God bless you too!

[@vencentbauer]

great video I have messed that up a bunch of times test light is only way to check them I finally bought tge Lesley relay extentions do all my testing with them very handy

[@fermate1991]

Iam learning a lot from your videos.Thank you very much.

[@GRUSSNewton]

I have been caught out using a multi meter in the first part of the video. Excellent explanation as usual Paul!

[@stevelong7702]

Thank you so much. I love your videos and they are real educational. I was able to fix my 96 GMC C1500 with this video. I have made a folder, and have been subscribed for a while now to save your videos as they are the best. Thanks again

[@noejitta]

It definitely does, and I completely understand your are teaching ever aspect of how to test. Which is excellent, I really appreciate your channel..just wanting to make sure my thought processe was right...thanks again

[@sensign671]

Great analization. by the author. Thanks for the post, and look forward to Any further ones. You guys are the electrical Kings!

[@ScannerDanner]

Thanks Scott!

[@ericgilbert7194]

I very much appreciate this video! Although it wasn't the issue I was experiencing at the time (fuel pump working intermittently), it did get my brain gears in motion. I had removed the bed to change rear cab corners, and had just loosely placed the ground bolt back in place, that just happened to ground the bed lights AND the fuel pump. After finding no continuity between the pump lead ground and the frame, the a-ha moment smacked me like a freight train. A very good feeling freight train :) Subbed, and thanks for the content!

[@ScannerDanner]

awesome and great find by you, good job and thanks for the sub!

[@amandabryson1689]

I have been learning so much from people's hands-on videos.Thanks for letting us pic ur brain.

[@sanduskyserpents]

great video....i have to do this same thing in class tomorrow and this visual aid was a great help!

[@allanhongemail]

Thank you very much for a great video on a fuel pump and replay.

[@JOKERBABYG]

I learned something new today 👍 good video thanks for sharing 👍

[@brt-jn7kg]

Pay attention this is a mechanic at work he is a maestro he is a professional

[@georgebonney90]

this was a great video,i really enjoyed it and learned something,thank u mr.danner

[@ScannerDanner]

i literally just laughed out loud. Thank you and Merry Christmas! now you can start looking for it and using it to your advantage.

[@jamesduca1756]

OMG, I've been scratching my head on this for ever!!!! Thanks.

[@ScannerDanner]

Nice! Light bulb moment then?

[@fivefortyeye540i]

And the Oscar go's to, Scannerdanner !! For best supporting instructor! Now I get it, I needed that visual. Lol that Buick cooling fan relay has been haunting me. I can see now threw this vid where I was getting confused.. Thanks Dan for breaking it down..

[@PRACERZ]

From a tech to a tech, great vid !!

[@wtfhappened661]

Wow... You guys deserve medals for your painstaking film! I still don't quite understand why the PCM needs that bias voltage - which makes a 1950 test-light superior to a modern, 10-MegOhm meter - but that discovery at the back reinforces what I tell people about using OLD shops instead of start-ups... I actually encountered the same problem with 110V in my Elks club. When I converted old-style potentiometers and mag-ballasts to modern electronic units, they wouldn't dim... Sure enough, some moron had wired white-to-black & black-to white! LOL

[@tammykey9370]

Wtf Happened ..

[@MitzvosGolem1]

Wtf Happened Bias often is needed to hold transistor on or off in ecu circuit and other electronics. Gets complex in solid state boards.

[@martinmoffitt4702]

"I don't make the circuits"... more like you explain em' priceless thank you for your talents!

[@ScannerDanner]

Glad you like them!

[@martinmoffitt4702]

@@ScannerDanner Nice to see quality product and someone who KNOWS what they are talking about!! Thank you again!

[@Mr572u]

Enjoyed it, understood it, and I still like the access hole in the bed floor too!

[@noelconroy3647]

Thanks for sharing valuable information on regulator pressure

[@ScannerDanner]

thanks for watching!

[@NDJones-th6jq]

you saved my butt showing bias voltage . I was making check on my 1998 5.7 vortec and showed 12.24 v. this was messing with my head and i was thing something else was wrong.... I had watch someone else on this relay and they said no voltage on that pin with key off.....thanks so much.

[@ScannerDanner]

Nice! So many people have no clue it is even there.

[@8_track]

Hi Scanner Danner, great video! I learned a lot, thank you. I have a 1997 C2500 5.7, (bought new, cared for, now has 229,000 miles and looks a drives like new) and I'm curious about amperage. I'm drawing between 9 and 10 amps. I used my Fluke 337 clamp on amp meter on the wire to pin 30. The reason for all of this is the 30 pin got so hot it cooked the surrounding plastic. I repaired everything and now for the first time, I'm checking for heat and finding some after a 10 minute drive. 30 and 87 are hot to the touch. Is this normal, or could this be a sign my pump is going out? I'm on my third pump. First one died of low pressure. Second one didn't work after a six hour drive. I appreciate your help.

[@jonboy545]

Wow... this is a phenomenal video, with a very thorough explanation. I always wondered how GM and Chrysler could monitor Relay circuits and throw a P1XXX code for a relay coil (control) failure. Im sure other manuf. do as well, Ive only seen it on GM and Chrysler. Thank you very much for this video. I don't use a test light as often as I probably should, usually use a DMM. I'll have to pull out the test light more often.

[@henrys5155]

Well done, you obviously know your stuff!

[@mechanicshaficug9456]

Thanks for the great explanation ireally appriciate that u introduced to me the basic wiring concept

[@ScannerDanner]

You are most welcome

[@RdustinJ]

Ok. I'll try the jump start and see how that works. i need to get a fuel pressure gage anyway in case something like this happens again. Appreciate your info and help. Thank you

[@mohawkmike142]

Danner, You just made my day with that biased voltage explanation. Awhile ago i was working on a relay circuit and my voltmeter "found" this and it threw me for hours. Nobody I talked to ever had an answer. Like a Christmas present LOL Thanks. Hope Santa brings you one of those Lisle relay test jumper kits. The dink that stabbed, cut and miss wired that pump should get coal.

[@teristoledo]

great video Paul. Like all of them. i studied 2 years in school and now i spent hours and hours in front of my laptop wathching them... i wish i find the money to buy the book... you made me love the scopes and i intend to buy one soon ( hopefully ) :). Love from Greece

[@78monteman]

Thank you for posting this. Bias voltage who would have known. Helped me out a lot. Still not receiving the correct voltage from the PCM. Off to figure that one out.

[@giftofnile]

Thank You, Scanner Dan for a great video, Question did you have your ignition key on when you measured the AMPS?

[@AlForte13]

Thanks @ScannerDanner great explanation, I know I have a bad pump (not crossed wires) I need to figure out how to change the pump.

[@PaulCTownsend]

Great info PaulMerry Christmas to you all and your brother to.

[@dennissmith7657]

I have a '94 silverado I have to work on sunday apparently they changed a dead battery and i no gas since. I checked it out a while back and pump isn't kicking on. I was almost ready to change pump till I saw the work involved. probably the pump but good to test power first for sure. Wasn't sure where the relay was..till now..very thorough video my man! thanks

[@ScannerDanner]

@Bonfield2002 Did the bias voltage part make sense? Was it clear enough? It was certainly difficult to explain.

[@ScannerDanner]

The gray wire is the pump feed wire and you will not have power on this wire unless the relay is energized. Is the control side of the relay functional? Do you hear it click? The control side of this relay is power side switched my the PCM. Do you have two power feeds during a crank to this relay?

[@s1ight]

Genius, this guy SHOULD be an engineer designing this stuff. Seems more intelligent then me and most of the people I went to school with for mechanical engineering.

[@ScannerDanner]

Thanks man, I'm just a guy who barely passed high school and didn't figure out that I was functional until I got to electrical and electronic classes in tech school 😄 Life's been different ever since

[@kennydewilde]

Very Nice video !!! Especialy the bias voltage this misleaded so bad, Good job guys keep it up Grtz from Belgium

[@jpacheco033]

Great work! Very informative.

[@BMTroubleU]

it was only my 1990 MH barina, aka suzuki swift, picked it up from a mate for $100. i was more worried about the branding of a paper clip shape singed into my fingers. PS ETCG got me onto watching your videos dan and im now a big fan. youre an excellent teacher and video maker- keep up the fight mate

[@ScannerDanner]

I have seen a jump start do the trick. I have another video on this system where I show the tests you need to do. Search "fuel pressure" or GM cpi

[@ScannerDanner]

can you define very weak? test light or voltmeter? If you jump the load side contacts of the relay will the truck run? (jump 30 and 87 and DON'T jump 85 and 86)

[@michaelhart2596]

Scanner Danner is awesome!

[@ScannerDanner]

+Michael Hart thanks Michael, I'm really not, I just enjoy what I do.

[@BriannaGamer-kk5gy]

I have a 99 Ford contour I'm trying to see if fuel pump bad the car stalls every now and again won't start right away the first like 3 tries but eventually it does it starts right up .now when heats on I'm smelling burnt rubber coming through the vent .lately the car has stalled it has like pushed a little like pulling me .is this My fuel pump and how much do u think it will cost to replace opinions please???!!!

[@traslaverdasinmentiras519]

@@ScannerDanner help got the same problem 4 mecanic and no luck do you have a shop in Texas

[@pmzwatchinyou]

Thank you!! You are an excellent teacher!!

[@ScannerDanner]

Thank you. Did the bias voltage part make sense?

[@makaainana]

awesome bro!!!! Bias voltage EXPLAINED!!!

[@morrie3000]

Hey Danner I have the 97 chevy express I replaced the pump hooked wires up correctly pump wasn't coming on so I got under the vehicle with a tester light hooked it up to a ground and the grey wire and pump ran I turned the van off let it sit and cranked it again now it comes on with no problems any ideas whats causing this

[@Mark1944089]

I learned something off of this video & Merry Christmas:)

[@sdenney89]

Damn Dan,,, your flippin awesome! I'm a 30 year mechanic and wish I had your powers! I amaze myself at my abilities every day? Jus wished I had your drive n, desire to be the best?????

[@ScannerDanner]

It is called a smartboard. If you want to learn more about what I am doing you should get me eBook. Go to my channel page for the website listing, or it is embedded in all of my videos. (Auto Computers Troubleshooting)