How to Check Fuel Pressure (How to Tell If The Fuel Pump is Bad)
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- čas přidán 7. 08. 2024
- How to Check Fuel Pressure. How to check a Fuel Pump, Fuel Pressure Regulator. How to Tell if Fuel Pump Is Bad. How to use Fuel pressure Tester. Bad Fuel Pump Symptoms. Chevy Avalanche, Silverado, Test and Diagnose Fuel Pump In Your Car or Truck.
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Nice, to the point, no song and dance just the facts. Thank you!
Thank you. I have used your channel a lot when diagnosing problems with my vehicles
Jason D.
Thanks for responding so quickly . It's not a whining sound . It's the exact sound you hear at the fuel tank when the fuel pump is priming - except , this sound is more faint and in or at the back of the engine compartment . You can't hear it back at the fuel tank
You are exactly right about the fuel injectors , now that I have slowed down to think about it . What I'm confused about in the second part of your last comment is the part about " hid's " and the ballasts you mentioned again . I've tried to look up online where this part would be on my 2000 chevy 1500 and nothing comes up for it . BTW , I will try removing the fuel pump relay today to see if that makes that noise stop and I'll give you a follow up . Thank you for your other suggestions .
Great video! Easy to understand and apply. Thanks!
Thank you 🙂
Thank you for taking the time to make this video and pass on your diagnostic skills.
Anytime🙂 thank you for your support and appreciation
Thanks for the information!
thanks! simple and useful!
Thank you🙂
Very nice video
Thanks for the nice video
Thank you for the support🙂
Awsome video... Straight and to the 👉...blessing
Thank you🙂
@@backyardchevy328 please explain thise video
@@BURDARAUF well i connect the fuel pressure gauge to the fuel rail on the vehicle...first thing i do is turn the key to test the fuel pressure regulator and system to see if it holds the pressure which it does and that tells me theres no leak anywhere in the system...then i turn it on and the pressure begins to drop because the fuel pump is failing and cant keep up with the engines demand..and then eventually the engine shuts off..indicating a bad fuel pump
Nice using gauges to verify pressures, nice video
Thank you🙂
When you mentioned a fuel damper , did you mean the schrader valve ? I tried looking up the location for a fuel damper for my truck and couldn't find one . I found a steering damper .
Great video ! 👍
Thank you🙂
@@backyardchevy328 You're welcome !
Thanks!!
Thank you for the support 🙂
Thanks! Great help.
Nice
Great video
Thanks for the video. What brand is the gauge you used?
ATD 5567..thank you🙂
Can you still read psi measures from your vehicle when tho it’s not turning on ? Cracking only ... possible testing it when it cracks no start ? Will pressure still be sent ?
Yea when u turn key fuel pump comes on for a few seconds so it should read pressure just turning key to on position and while cranking it should read pressure as well
My 96 Silverado 4.3 has a hard starting problem i have to crank it a few times before it actually starts. Do you think it could be a bad fuel pump? I changed the ignition wires put ac delco iridium spark plugs, ac delco ignition coil , ac delco distributor rotor and cap and also the crankshaft sensor but still hesitates to start.
Usually thats a problem with the fuel pressure regulator(unfortunately its same work as replacing full pump)..the fuel pressure doesnt hold in the lines because its leaking past the fuel pressure regulator back into the tank, so its gotta build up pressure again and thats why u have to crank it a few times.
I have a p069e code on my Cadillac ATS . I changed the fpcm but now it won’t start
I have a P0174 showing on my 5.3 liter Sierra, I sure hope it's not a lazy fuel pump. Haven't checked the fuel pressure yet but that's the first test because I want to know if it's the worst possible thing first, leaks or bad o2 sensors aren't that bad to deal with.
Thats usually a bad upstream oxygen sensor bank 2 on those vehicles..do u know if youve ever replaced it on ur truck? If u have a way to monitor the oxygen sensor activity..thats best way to tell if its bad..if not id start with looking at any vacuum hoses for any cracks or rubber torn..if that looks fine..u can try cleaning the maf sensor
@@backyardchevy328 I bought it used, it's a 2013 I'm the second owner so I don't know if the sensor was replaced or now, if I were to guess I'd say it's the original sensor, truck has just under 155,000 miles on it. I put in a new air filter and MAF sensor last week. I have just a basic code reader so I can't see activity like graphs but I know a great mechanic that has a Verus Pro tablet so I'm sure he can find out.
@@darktoadone5068 They should be replaced around every 80k miles so it may be a good time to replace em anyways..but if he can get the activity it would be a good idea
If I put the key on I press the bleeder with a screw, a little burst of fuel comes out and that’s it. Should the fuel come out at a constant rate with just the key on? Or is the little burst normal. Truck won’t start sometimes thanks.
Itll spray a pretty hard spray to relieve the 50psi or so itll have and then keep leaking for a while as u hold it
I tried to check the pressure on my 2002 Chevy Tahoe due to it starting shaking and rapidly shuts off, when I checked the fuel pump pressure it read 20 psi on the start position and less than 10 when actually starting the truck, is it the fuel pump that is bad or is it possible that it’s something else, thanks
Thats too low..yea the fuel pump is not pumping the pressure it should
Thank you
Anytime🙂 thank you for the support
Backyard Chevy your welcome
Try this..
99 obs 5.7
New pump (delphi after the Delco took a shit after 6 months. Come to find out the Acdelco and Delphi are the same exact pump), filter and upgraded injectors. Truck primes to 20 psi and holds (regulator should be good), starts like new and runs for a few minutes then bogs out and dies. Wait a few and she'll fire up and run again then bog out. Also threw a new pump relay to replace the original factory relay lol . Oh yeah, off the pigtail I get 12v on grey and 5v ref on purple....any help would be killer!
.....
By upgraded do u mean bigger injectors that flow higher psi? Cause if so..injectors need to be tuned and probably why its flooding ur engine
What does it mean when you start it and the psi is higher than without it running
When u turn the key to on engine off..the pump will build up oil pressure..then the fuel pressure regulator will release the fuel over the amount it wants to regulate it at...so once u start it..the fuel pressure will be drop a lil lower cause its at the rail and the fuel is being sprayed into the engine so its maintaining that same amount of fuel but also being consumed
My fuel pressure on my 03 tahoe is 42 psi when on . Runs bad like it doesn't have power . What could it be ? Need help lol
It is a lil on the low side...any check engine light? Does it go up if u press the throttle?
Excellent. Also, when fuel pump is bad, there is no check engine light?
Thanks.
Thank you🙂...yea the fuel pump wouldnt trigger a check engine light...only maybe a misfire code may come on
@@backyardchevy328 Thanks for your Informative videos.
@@cck0728 anytime...thank you for the support🙂
What ended up being the problem with this vehicle? I'm having the same issues.
Fuel pump..i have a video on the replacement as well
My truck died on me 2 times i have changed hellla parts but not yet the fuel pump and also when i accelerate it dosent down shift it just tries to go faster but its very slow any thought anyone???
Before you replaced the fuel pump did you test the fuel pressure valve ????
Yes thats what im doing in the video, testing the fuel pressure at the rail, which is telling me the fuel pump output.
What if the needle doesn’t stay in place when ign key is on? Mine stays at 45 for a split second then slowly goes down to 20 and stays there. My car back fires, stalls, and loses power once in gear
If it doesnt hold pressure its either the fuel pressure regulator not holding the pressure which is part of the pump assembly too..or could also be its losing fuel pressure somewhere like at the injector or rail etc...but if its doing that most likely all related to the fuel pump as well
Could that also be the reason why my car could be running rich? Sometimes it smells like too much gas. Even the smell stays in the car. I’m having nasty popping sounds coming out the exhaust. Its starts stumbling under heavy loads and it’ll even die during driving.
@@LuisMunoz-jc1pi any check engine light for misfires? I would check ur spark plugs..if u find any that look completely black that are fouled with gas..then those cylinders might have leaky injectors and thatd be why the strong fuel smell too
What size is that hose to fit chevy.
Its a 3/8 fuel hose 16 gauge hose and its about a 14 inch long
THANK YOU.
My car is acting the same way. It will stall on idle especially with the ac on and when I give it a tiny bit of gas. My car doesnt have a shrader valve and I'm not too sure how to use the t fitting.
What kind of car is it?
@@backyardchevy3282003 Mitsubishi Diamante
@@jermainemathis9865 on those u use an adapter with a barb fitting to attach between the fuel rail
Haven't gone out to purchase a fuel pressure tester. My car doesn't turn on it cranks but won't start . So how would it apply to me. If the pressure is good the pump is good? Because I won't be able to start it so see what was shown in the video
If fuel pressure is good then u know its not a fuel issue, so u check for spark to see if ur not getting spark from ur coils. What type of car?
@@backyardchevy328 well in the video when you where turning on the key to on/off you said good fuel pressure. Then you said bad fuel pump when you turn it on and the pressure went bad. My car is completely not turning on it will crank but not turn on. So can I assume if I have a bad fuel pump if I get bad pressure or will I assume a good one I'd I get good pressure when I crank it?
@@eduardodelgado7873 reason i said that cause when u turn key on the fuel pressure looks to be good..but when u turn on truck the pump cant support the fuel pressure..meaning its failing and wont keep it running
@@eduardodelgado7873 yes if u get good fuel pressure and u crank the car and fuel pressure stays good, the fuel pump is not the problem
@@backyardchevy328 does the numbers vary by car or what numbers should I get?
When I checked the fuel pressure on my 2000 chevy silverado 1500 5.3 , it read 50-51 PSI . When I started the truck , the pressure dropped to 48 PSI and the needle on the tester vibrated rapidly up and down within about 2 - 3 PSI of the 48 PSI . Is that normal ?? I have seen other videos of people using these testers and the needle usually stays fixed on a number when they start their trucks - unless of course they have a significant drop in Pressure . I kept hearing a constant , faint sound in the engine compartment like the sound the fuel pump makes while priming up - I couldn't hear it at the fuel tank . I always thought , when the fuel pump primes up it shuts off until you start the truck . That sound is at least 6 feet from the fuel tank , coming from the engine compartment . Does anyone have any ideas or know what it actually is ?? Any help would be greatly appreciated .
U probably have a bad fuel pressure damper, its the lil valve thats located on the fuel rail, ud wanna make sure that ur hose going to it, is not damaged.
That whine noise is with key on engine off?
how did you know it wasn't the fuel pressure sensor?
A bad fuel pressure regulator?..when u turn the key on, if it holds the fuel pressure once the pump turns off as it did on the video means its good...a bad fuel pressure regulator when the pump shuts off, the fuel pressure will keep dropping
Backyard Chevy so the pressure should hold with just the switch on right ? Even on returnless system ?
@@garciae2571 yes, every system may have different specs that it should hold at and for how long, but every properly working system should hold pressure
The noise is so faint , I was leaning toward a fuel injector or 2 being stuck open . I ched all 8 with my stethoscope and that wasn't it .
Maybe u can pull the fuel pump relay and see if noise goes away, if it was an injector when the trucks off ud lose fuel pressure..i know if u have hid's the ballasts can make noises that sound similar.
Misfiring ?
We’re u able to hear the fuel pump ?
yea ud hear it buzz but it wouldnt be continuous and then ud hear the buzzing stop shortly after.
Can't you just loosen the fuel filter? Won't fuel come out if the fuel pump is working?
Yea but a bad fuel pump can send fuel but if its not enough pressure it wont run, and u wouldnt wanna do that on a pressurized system itll spray fuel everywhere
I’m surprised there was no cel lol
Yea i know...i would of expected a check engine light for misfires