The #1 Cause of Fuel Pressure Problems

**This video specifically addresses problems with aftermarket fuel systems and does not necessarily represent problems with a stock fuel system.
If you’re having trouble figuring out why your fuel pressure is not consistent, you might start by looking at your choice of fuel pressure gauge. I’ve recently learned that these are a big problem and it’s saved me a bunch of headaches. I hope this information is also helpful to you.
Aeromotive article about fuel pressure gauges: aeromotiveinc.c...
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[@SouthMainAuto]

#1 cause of fuel pressure problems at SMA.... cars out of gas....

[@ericthecarguy]

Mmm, got no gas in it.

[@chunk386]

2 Eric's is one comment!!!

[@ourkid2000]

@@ericthecarguy got'ny french fried potaters?

[@digitalrailroader]

Chunk ERICCEPTION!!!!!!, *insert Inception horn here*

[@dirtbagdf]

But the needle was on "E" yesterday and it ran

[@frankp.2831]

Eric, you need to cut off the tip (pointy part) off of the fill plug. The plug seals the gauge so that the glycerine doesn't leak during shipping. Unfortunately, if you don't create an opening by cutting off the nipple, the outside of the bourdon tube, the part that changes shape as pressure inside it changes, has no reference to atmospheric pressure which is what you're measuring fuel pressure against. If there is a pressure build up inside the gauge case for whatever reason, the needle will indicate a lower reading than if the gauge mechanism was exposed to atmospheric reference pressure. I.E, 9 psi fuel pressure will indicate as 6 psi on the dial if there is a 3 psi pressure build up inside the case. I've seen this problem many, many times in industrial applications, especially in lower pressure ranges like is the case in your application.

[@robertfranklin7040]

Aha!!!!! interesting! explains why the cheapo liq-filled gauge I used on my 91 Storm never acted up on me. I swapped out the glycerine for mineral oil because the provided expansion space was way larger than it should've been & I couldn't find glycerine with which to bring the level up to spec. I decided to push things & leave a smaller bubble for aesthetics, *installing a rubber expansion tube I dyi'd onto the gauge* . I left it open ended & *LOOSELY* packed with a bit of cotton ball to keep out contaminants. Maybe the mineral oil helped as well?

[@slowcountryboy476]

Good point.

[@Trunxic]

Definitely helpful Eric! I was actually diagnosing inconsistent pressure this past week on a built '17 Subaru STI. Sadly, the gauge wasn't the cause of the problem. (we mount our fprs and gauges on the strut brace usually instead of the engine. Helps a lot with vibration issues) Turned out it was an issue on the Venturi pump siphon/scavenge setup in the fuel tank. Installed a new Venturi pump and simplifies the system, and the pressure got much more consistent. Less pressure in the return line to the tank! Needless to say, there was a lot of "tail shaking" going on for us too

[@roaddog1973]

I have the Aeromotive gauge and it does the exact same thing. The Aeromotive gauge fixes nothing.

[@sadakotube]

I use this. Its notoriously inaccurate and i only use them to see if fuel pressure is on or off. The fix is actually just to remove the rubber, to equalise the pressure inside the meter. Still, not really accurate. And opting for electronic pressure sender is really a better choice

[@Mandurath]

Huh, that's interesting, used similar old gauges on alot of cars in the past. Though I never really paid attention to them. Actually, I would have said little sisters. I had a nasty little 65 mustang, had just finished working on. Went inside for lunch. Then went for a test drive around the neighborhood and what had been running great, wouldn't go over like 2k rpm and it would choke and sputter then die. Stopped and popped the hood, my fuel line was having a seizure. My pressure regulator was set all the way down. Turned it back, thinking all was ok. Nope, ran good now but wouldn't go over like 2k. Then noticed my rev limiter was also set to the bottom. After that it was all good. She had went and changed them while I was inside.

[@ericthecarguy]

The joys of hot rodding.

[@Mr92cadi]

I always like your videos before I even start watching because of the content in which you provide. Good luck with the new gauge

[@jerryrounds8586]

Thanks for the continued excellent advice.

[@ng6585]

I have modified the fuel hose to little bigger diameter with stock fuel pump result is always low fuel delivery and increased long term fuel trim.

[@channel_56_]

Keep up the good work Eric! Can't wait to see the videos with the new Acura :). Hope to start my own channel about custom motorcycle builds pretty soon and you and other KZbinrs like HumbleMechanic, EngineeringExplained,, ChrisFix, Edd China and many more sure inspired me to do so!

[@GoldSK96]

I love your videos, pure mechanic knowledge

[@CHRISINMCNEILL]

Hi Eric. Thanks for the videos. This issue has been known for decades in the industrial gauge market. The non glycerin filled gauges suffer from the same issue but the percentages of the swings are a lot less than the liquid field due to the amount of volume consumed by the liquid versus the body size of the gauge. I have vacuum gauge is that have a little bar that you rotate that allows the inside of the gauge to normalize with atmospheric pressure this is very high quality gauge and it is non-liquid field. This issue has been going on long time, It’s just most car guys are cheap and don’t wanna spend the money on this type of stuff so these companies just throw the stuff out there and people buy it and buy it and buy it. Great videos. It boils down to you get what you pay for.

[@user-lh1hd5iw7h]

Whered you buy your vacuum gauge ?

[@CHRISINMCNEILL]

@@user-lh1hd5iw7h McMaster Carr

[@notj5712]

Part of the problem is you bought a house brand item. "Jegs" Who makes that?

[@BranMcRay]

I just put in a electric fuel pump and filter with all new lines and that regulator gauge and I’m having issues. At highway speeds if I let off the accelerator I’m losing all the fuel pressure and it eventually dies on me. Then if I wait 5-10 minutes it starts right back up. I can drive around town low rpm no problem. What could be the issue. We’ve already swapped another new pump and filter in and checked the regulator. Still having same issue. Wiring seems fine and it’s all new as well. Even got a new battery and alternator. Vented the fuel tank. Gas tank is clean.

[@patrickdubuc3439]

If gauge wasn't holding pressure wouldn't it being leaking fuel inside or something?that's where it's gets pressure from correct is from the fuel?

[@josephcarson8787]

So the gauges we've used our whole lives ain't right? Maybe so. I just installed a new fuel pump,and the injectors and regulator check out good. I've still got intermittent fuel pressure too.

[@JagLite]

Thanks!

[@michaelblacktree]

If you have an ECM that supports it, you could use a pressure sensor instead of a gauge.

[@misterhat5823]

Actually you wouldn't need an ECM. Just a circuit to convert the signal to a readable number.

[@mzaite]

why do you need an ecm? Gauge can run fine stand alone on a pressure sensor or transducer.

[@michaelblacktree]

You guys are absolutely right. There's nothing stopping you from using a stand-alone gauge. But letting the ECM / PCM monitor fuel pressure would be nice.

[@sheachopper6416]

My fuel pressure problems usualy reside once i stop eating ao much taco bell.

[@tonybrown3576]

superchopper 1996 evap issues hahahaha

[@michaelserrano7097]

My money is in a bad purge valve. XD

[@michaelblacktree]

Fuel pressure or exhaust backpressure?

[@mailmanjoe]

Do you get the large evap leak cel code after as well? Lol. 😂

[@LeaderofStupid]

Got a clog in the exhaust? Better get your exhaust valves checked

[@ozzstars_cars]

I have had the bouncy needle syndrome but nothing to do with fuel. 😉

[@garyborchert61]

Grèat info thanks , i am staying dirty 😉👊

[@jims2507]

I thought you were going to say "because people don't change their fuel filters"

[@AntonioClaudioMichael]

Great informative video

[@FrenchValleyAirport]

Why are they still allowed to be sold if they're giving false readings. confused

[@JMathew21]

my fuel pump on a 1993 cadillac brougham 5.7 failed is it a bad idea to replace it with a high flow pump? the entire car is original. WOuld it cause a problem? should i just go with an oem style pump?

[@duperfastEUC]

Question, I have a 2004 4runner v6 and I have a little issue that needs to be fixed. It's got 166k. When I start the car in the morning I get a rough idle for a few seconds. Then it runs normal, I have no idea what to check for that symptom. It doesn't always do it but most of the time in the morning it does. so for I've done new spark plugs, new battery and alternator, new air filter, I can't seem to diagnose and fix the problem. ERIC any tips as to what I can check next?

[@775automotive9]

Do you think it’s because it’s a cheap guage? I have one on my mustang and it seems to be fine

[@Flyingtoaster.]

Ford focus lives to have EVAP issues and sensor issues. Oh the disgust. Im getting rid of this car for a junk car i can upgrade on my own terms

[@williamcrazylacyfurmage9953]

my gas tank builds pressure and whistles through the gas cap on both of my 72 pintos i own

[@klausvonschmit4722]

Eric, you have it all wrong!! The problem lays with the distributor being in the front and not the rear of the engine!! Just Saying! 😁😂🤣

[@MyMickey50]

Eric!! Does this also apply to a liquid filled pressure gauge on a cng tank?

[@NiteHawk861]

My Silverado footage please. Thanks

[@wolvenar]

I thought fluid filled gauges were meant to remove the fogging and rusting problems.

[@ericthecarguy]

Maybe, but from what I'm told it's to help the gauge work better when mounted to a machine that vibrates.

[@domleno5507]

I never a problem with the filled gauge it's how u use It i have 2 sesperate fuel feeds from my regulater to my holly 750 I just hook the sesperate to 1 fuel line at a time turn on my pump set regulater and it good

[@michaelroot6064]

I have a 1998 s10 v6 fuel light comes on when tank is full will this make my truck shut off and think it's out of gas even though it has gas

[@nlholla]

Lol no

[@claudioagmfilho]

🇧🇷🇧🇷🇧🇷👏🏻👏🏻, Awesome vídeo !

[@Mechanicsville804]

Thank you! Acts 4:12 King James Version 12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.

[@BustedWalletGarage]

So, if you remote mount the gauge , say into the dash , it will work correctly ?

[@pantherplatform]

It's like a clock. It'll either be right 24 hours a day or right twice a day, regardless of its position relative to the engine.

[@ericthecarguy]

To do that would require running fuel line into the passenger compartment. Personally, I think that's a bad idea, however, theoretically, I guess it would work. That is unless you park your car in the sun and the interior temp goes way up, then same problem. The solution is simple, get the gauge linked in the description with the pressure relief.

[@dafirnz]

I believe that will get you sent home at a lot of race tracks.

[@BustedWalletGarage]

EricTheCarGuy 10-4.. thanks for reply

[@MrWilliam.Stewart]

Cause in the US gas is a liquid and liquid is gas? Sorry, couldn't help it.

[@jonathandedios8944]

sir,,, good day,,, my mazda 626 has a high idling speed when neutral,,, and when i accelerate , it will be dead...

[@678friedbed]

sounds like you weren't doing proper diagnostics and trusting your gauge way to much. if you are not getting enough fuel its doesn't matter what the gauge says you need to get the engine more fuel.

[@ericthecarguy]

I think you missed the point of the video. Thanks for the comment.

[@zx8401ztv]

I'm nosey, So i would take it apart and wash it out with alcohol, then refill with light oil. Just to see if it made any difference lol. I learn by taking things apart, always have.

[@LeaderofStupid]

Yeah, bit its outta warranty once you do. So if you mess up the reassembly, you won't get it replaced

[@codyboyd011]

Thanks!

[@lovund86]

Hi Eric, if you want a "true" reading on a glycerin filled gauges, you will have to cut off the rubber tip on the fill plug on top of the gauge, this is only sealed for transportation. more expensiv guages in industry have a valve on top with clear markings for transport and opperation posittions. i have workt for many years on boats and have sen this a lot. when you heat the guage, the air and glycerine expands, and the pressure inside the gauge increases, dus causing the pressure to read lower than it actually is.

[@ACommenterOnYouTube]

this is NOT a fuel pressure problem, this is a faulty gauge

[@markjordan4994]

I've only ever had two problems with fuel pressure. One was caused by a bad fuel pump. The other was due to the absence of fuel. :)

[@pantherplatform]

Why come no start? No gas. That's why come.

[@carloscoy5686]

Would you say you had to get a full tank in lol

[@HeadFlowInc]

Jim Hand, a prominent old school Pontiac V8 builder found out the liquid filled fuel gauges aren’t accurate when mounted inside the engine compartment, due to temperature fluctuations. Jim literally just pulled the rubber plug and drained the glycerin out, problem fixed! Some times simple is better! 👍👍👍

[@omarcorral2847]

Dammit. Just got that same guage a month back. Haven't used it yet. Nor will I. I mean it is only 20 bucks, you get what you pay for! Thanks Eric! Useful information as always!

[@NebukedNezzer]

Altitude affects pressure gages as well. anything that affects the pressure inside the gage will. example reduction of 1 lb of air pressure from increase in altitude(vented gage) will make the gage read 1 lb higher(approximately). its an imperfect world. we need to understand these things and not get upset by them.

[@michaelserrano7097]

Omg! My neighbor was talking to me last week about that issue with his 1964 mustang restoration built. Whe were blinding trusting those glycerin filled gauge.

[@plumbc007]

just been chasing a fuel pressure problem on a ford maverick bloody fuel pumps lol

[@genericdude6551]

I was expecting something that solves the problem on any vehicle.

[@alundrasrt]

Hope that You'll post a testing of this. Thanks for the tips.

[@aserta]

A simple solution to that problem is to just use a T split and a section of braid reinforced fuel line to a normal gauge that's located in an insulated enclosure somewhere near the nose of the car. Vibrations won't affect it anymore and heat won't sway it either. Trucks have this, WW2 planes had this. There's no magic behind it.

[@misterhat5823]

Just so as long as some genius doesn't take it to the next level and decide to mount that gauge on their dash.

[@LoqoRL]

Dude i have a 95 ram. Put a new tps, plugs, wires, battery, thermostat. After like 20 miles on the highway throttle becomes unresponsive . I have to let it sit 45 mins then it is ok.

[@heroknaderi]

Thanks for your advise.😎

[@GorhamWorks]

You ain't lying. Crappy gauge and being able to trouble shoot... result headache. Aeromotive make good stuff, I run their regulator, pressure gauge, and filter on my truck. Once you use their stuff.... warning... you don't really want to use anything else.

[@Backcountry-renegades]

Man. I have been fighting with my fuel pressure for months since my build. Thanks for this. Even my Holley has a rubber plug I just released the pressure and finally it all makes sense.

[@pjl1919]

I’m fighting a PO300 code replaced injectors,plugs wires,coils it’s a Ls swap in 89 c1500 I’m using a 255lph pump,corvette regulator,6an lines and new sending unit. I have 58 psi when it primes and at idle it has 70. Would that be causing my PO300

[@williambearden1230]

Hi I was hoping maybe someone could help me and send me in the right direction. So here's my problem I have a 99 f350 v10 gas I put 2 new fuel pumps on with in a 500 miles as well as new fuel pressure regulator and new fuel fuelter coils and spark plugs and my fuel pressure stays at 30 psi and I've been told it should be 45psi Minimum the other problem is that on both banks I'm negative 7% using a lot more gasoline than I should and have like no power up hills. I've taken it to atless 8 deferent Mechanics and they all say nothing is wrong with it but I can't get more than 30 mph unloaded up hill and I went from 19 miles to the gallon to 6 miles to the gallon. Someone please help me. Thanks for your time.

[@ekummel]

I've been chasing what I *think* is a fuel pressure issue in my Fuel injected Jeep Grand Cherokee. Whenever I take a corner at a moderate speed, and step on the gas to accelerate out of the corner, the engine bogs down like either it's flooded, or not getting enough gas...don't know what is causing this. Maybe I should put in a fuel pressure gauge and see what it's doing.

[@RBFR01]

so tough question. My car runs for 2 minutes and dies and wont start again and just turns over. I replaced the fuel pump, fuel pressure regulator and fuel filter and the sparkplugs are dry and the system is getting spark. Why does my fuel pressure drop to not enough? fuel pump ground?

[@frekkledipped]

my problem is my car, 65 gto with 3/2s, when idling smells of fuel out the exhaust. The 2 outside carbs are not supposed to produce fuel when idleing. I have removed the center carb and replaced several parts, im sure its not the center carb. It could be the Holley red f.p. installed. Im thinking of turning down the pressure fromthe pump to my regulator but not sure how to do it. Reg is new too. I adjusted my reg all the way to 0 and it didnt make any difference. Been looking for a description on how to adjust psi from the pump to my reg. cant seem to find any. Any ideas where theres info on adjusting a Holley red?

[@markcrisp8905]

Hey Eric ok my problem is on a 1999 f150 5.4 first start up long crank after that starts up quick but the problem is at idle engine misses drivining it bucks like fuel or electical cuts on and off ohm the coils all good fuel pressure key on engine off good engine idling pressure good plugs are new new fuel pump I am lost at what to do next. any help will be great Thanks

[@rolandomota1923]

I've never used mine and I checked my fuel pressure regulator gauge and it leaked alk the stupid luquid..líquido... wtf... I'll never buy that again.... what a dissapointment

[@novakenss]

Exactly what my glycerin filled gauge is doing when hot. Drops to 2 psi and adjusting the regulator does nothing. I'm putting in a non liquid filled gauge tomorrow. Thank you so much.

[@TheAlignmentGuy_TM]

The Alignment guy says... The most important part of using measuring equipment is knowing when your measuring equipment is lying to you. JMF TAG

[@chrisostrande]

I have a clear glass filter. When the motor is not running, should the filter drain or should fuel always be present (full)?

[@benoroarty4207]

So fuel pressure hasn’t changed, it’s just the gauge giving you false information, right? Could you adjust the pressure on your fuel pressure regulator on a cold or warm engine, disregarding the gauges info after it gets hot?

[@TargaWheels]

A lot of gauges are questionable now, more than before, liquid filled or not. The problem goes across quality, price, size, etc. It doesn't seem to matter if its American made or not.

[@danielrobinson8105]

They build pressure inside when hot the pressure release is on top use the pressure release like it's supposed to and it works just fine I sell the gauges at work and have people come back over it all the time if people took 5 seconds to read the little pice of paper that comes with it I wouldn't have to tell people 5 times a day about how it works lol

[@lilnapsak1828]

im having this same issue but with my oil pressure... same thing? I added a mechanical glycerin filled psi gauge next to my sender and its acting the same as this here.

[@MichaelGawesebmainone]

I get F1007 and F1014 codes still searching what they mean. Somebody suggesting it may be crankshaft or timing issue, maybe crankshaft sensor, but I doubt car could be out of timing as it was not opened. Someone suggesting it’s a fuel problem perhaps too much fuel. It’s a Peugeot 207, any idea where to start? Have replaced fuel pump already, seemingly not cause.

[@cyberjef]

I note the proliferation of electronic pressure gauges, these can monitor oil or fuel pressure and are in the $20 range. They do require a wire from the sensor, one for battery voltage and a ground at the sensor as the sensor might be isolated from ground as it is on my old Honda.

[@tawidave7092]

Guess what I just bought? F@#k my life.

[@billyexotic206]

THIS VIDEO IS MISLEADING. THAT IS NOT A FUEL PRESSURE PROBLEM. THIS IS SIMPLY A BAD GUAGE THE PRESSURE ITSELF IS FINE. THE CAR SOUNDS LIKE IT RUNS FINE. I WAS LOOKING FOR WHAT CAUSES A CAR TO ACTUALLY DROP OVER A SHORT TIME.

[@DownRange02]

Misleading title. This is about gauges, not fuel pressure problems. 🤷🏻‍♂️😔

[@AlanSchildroth]

Yeah! My fuel gauge is bouncing 1/2 in either direction!

[@jackpatteeuw9244]

This not just an issue with mechanical liquid filled gauges. Almost all pressure gauges, including electronic one, suffer from the similar heat related inaccuracy. Because the change occurs relatively slowly, a computer can sometimes compensate, especially if it knows the temperature of the fluid it is measuring. There are other techniques that can be used for electronics but they are all expensive.

[@misterhat5823]

What about a stock fuel pressure sender?

[@red90rover98]

The only way that would happen is if the gauge body does not have a vent. It must have a vent..... I've used liquid filled gauges in industry for three decades and there is no inherent problem. You need to open the vent when you install them.....

[@mzaite]

You assume these are built well.

[@ralfsautomotive]

In your situation I may agree that the gauge is a problem but for anyone to just call these Junk is stupid! They are widely used in industrial settings for decades on in. Why did you not just check with another gauge in the first place? One of the problems with the "Jegs" gauge could also be that it is a cheap china POS.

[@Ronaldofmx88]

Thank heaps mate good, would not have known

[@Ny_Foxbody93]

Eric Iv been chasing my tail on my car for a little while now, long story short my fuel pressure was fine and reading good, after a small incident the car started reading max fp, changes 3 differs fp gauges and replaced the same regulator with a new one, checked fuel filters,kinks and cannot seem to figure out why I can't get back down to reg fp (5-7psi) by the way this is on a sbf 302 fox

[@Lierofox]

To clarify, it's not so much a problem that the gauge is liquid filled, the issue is more a matter of the gauge being SEALED and able to build pressure against the fluid within its housing which affects the bourdon tube. It's entirely possible to get liquid filled gauges that are able to be vented periodically (feasible if you vent it before taking the reading, if it's in the engine bay you won't be reading it in motion anyway.) Another option could be to modify the gauge by adding a breather tube on top to allow it to constantly be at atmospheric pressure regardless of the temperature (and help mitigate fluid loss from splashing out) As a similar concept, consider an axle breather, same concept, temperatures rise and the pressure safely vents up and out. Simplest option though? Yeah just replace the dang gauge with a non sealed unit. (This isn't directed at anyone in particular, just tossing it out there.)

[@GenerationNoise]

the number one cause of bad fuel pressure is a bad gauge ...c,mon dude

[@themechanic6117]

I've only installed two liquid filled gauges on my fuel rail...eventually they vibrate so much they actually fall apart .never used one again.

[@AwakeDude911]

18 jegs employees disliked this video !

[@pedery2k]

1994 Ford Explorer 4.0 V6, starts good, runs good, but consisent low fuel pressure of 26lbs. 3 different guages all read same. Replaced fuel filter and regulator. No change. KOEO reading steady 28, KOER reading steady 26. Web search says engine quits at 25. Whats the issue?

[@Blown6thGen]

Just got my 0-100 PSI Gauge today aaannnd of course it's leaking fluid from the rubber gasket under the pin. Thx Aeromotive.

[@JSchrumm]

Drain the oil out of the gauge.

[@123nova87]

If I started having low fuel pressure around 3 to 4 psi. Car won’t stay running long it slowly dies or idles at very low rpm. Have MagnaFuel 500 pump and regulator. Was on my nova for 12 years. Could my pump motor start going bad ? It started last year with breaking up at high rpm like fuel starvation. It used to stay at 6.5 to 7 psi.

[@misters2837]

Why don't you have a "remote mount gauge" and have it in the cockpit...the Glycerin stays same temp as the inside of your car...(I actually made my own from a Direct mount, used a Trerice gauge off EBay that had the diaphragm for low pressure suitable for chemicals equivalent of gasoline) and filled the lines with very light viscosity motor oil...and viola I have a Fuel pressure gauge safe to be cabin mounted...(I wanted to use 1980s Ford Motorsport N.O.S autometer gauges that matched my build)

[@racingdreamz8021]

I have a 2008 Chevy Equinox 3.6L, The fuel pressure is at 60 psi but needle is very erratic & the car is misfiring consistently, any idea what this can be?

[@donebrink1313]

Hey Brother whenever you can help me out I have a 95 Mustang with a 5.0 in it converted it over to carburetor it's an Edelbrock carb my problem is when the car it has good fuel pressure at first right around 5 to 6 then after it warms up it loses pressure and drops to zero and then the car starts to run bad hesitate had a problem with a couple fuel pump leaking got a brand new one on there now doesn't seem to be leaking but still having the same fuel pressure dropping issues any help would be greatly appreciated

[@stupa55]

FYI: Really strange the article. All the glycerin gauges I came across tell you to pinch with a needle a hole in the rubber plug for the first usage. Next advice is to use the gauge in a way the rubber seal is always in the highest position so the glycerin will not spill out.

[@Seegalgalguntijak]

I'd wager a bet that your fuel pressure hasn't ever been inconsistent - only the number that the gauge read was inconsistent. Since, why would a fuel pump deliver less or more fuel, only because a gauge doesn't show the right number? OK, if it were an electronic gauge with a feedback loop into an engine computer that also controlled the fuel pump(s), then you'd have inconsistent fuel pressure, but hey, that would be fuel-injection problems, not relevant to a carburated engine that isn't computer-controlled ;)

[@vegansaxon3962]

Well that counts out my problem because I don't have a gauge on my crown vic...its running rough and cutting off..I check the pressure at the rail and it just shoots up a little...I compared it to my grand marquis that I just put a new pump on and it sprays out with plenty of pressure...so I thought I needed a new pump in the crown but after installing the new one it hasn't changed anything...I can hear the pump humming and shutting off like normal but hardly any pressure...beautiful Florida day here but feeling a bit discouraged....I know there is a solution

[@firstname6165]

im still waiting on him to mention "The #1 Cause of Fuel Pressure Problems"

[@travismcallister417]

It's the gauge. If you actually have one of those things it's the problem. Which is for like 1% of us... smh

[@chrisluquette1615]

@@travismcallister417 Actually it sounds like there was no driveability problems. Only a gauge problem.

[@marshalparker4434]

Eric your gauge sounds accurate. I run Fuel Pressure control. 45-100psi to be exact. It's PWM based. When cold(Pump, Injector,Lines ETC) I need less duty with higher Frequency to hit my Target Idle Pressure of 45PSI. So my X Axis is Fuel Temp Y axis is MAP. FYI I monitor Pressure with both a Needle gauge and 3 wire Transducer. I can tell you for sure. Your Pressure is indeed higher when the system is cold. That said think your Gauge is accurate. Best to isolate gauge/Reg from engine HarmonicsThanks for all you do I have been watching your videos for years.

[@Bige4u]

The only time i had a non filled fuel pressure guage read steady(within 1psi) is when i had an aftermarket mechanical fuel pump and using no regulator whatsoever, it was a Carter M6900 style fuel pump for my mild build SBC back in the mid 90s, advertised at 6psi, my fuel pressure gauge needle only varied between 5.5 and 6.5 psi, no more, no less. Compared to these $25 mechanical fuel pumps as a stock replacement, advertised at 5psi(Delphi MF0001), but connect a fuel pressure gauge inline, and the needle bounces all over the place showing a much higher reading. I bought that delphi unit for my ZZ4 crate engine, i took it for a test drive, and it ran fine, i've always had the impression and also seeing it on YT that if the fuel pressure was too high, it would overcome the needle and seat, over fill the bowls and you would actually see fuel dribble out of the ventury boosters, but my holley 650(0-080783C) carburator hasnt done it, and the set floats and fuel level stays steady in the fuel bowl via the sight glass.