Question about 1999 GMC Sierra

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Sputering so i check fuel rail some gas doesnt want to idle occasionally will start and run then looses pressure and stall

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Fill the tank to over 1/2 tank and add Chevron Techron fuel system cleaner

Do a fuel pressure test at the fuel rail.

The PSI should be 55-70 psi (or check the sticker under the hood)


Test fuel pump relay.

Check oil level and oil pressure. Low oil pressure,low oil pressure reading can stop the fuel pump from ran. It's a build in safety feature.

If it start and ran better the add only bottle of RED Iso-heat dry rule out water in fuel.


My bet is a weak fuel pump.

Fuel pump with over 110,000 miles will like to fail in a HOT day.


You are on the right track,

Posted on Jul 15, 2009

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My 2005 Ford F150 started stalling and seemed like it was running out of gas. I changed the fuel filter and now when I start it, it idles for 2-3 minutes and stalls out? Where to check fuel pressure


Have the fuel pressure tested to see if the fuel pump is the problem. You can check pressure just by turning key to ON, after you have connected a fuel pressure gauge at the fuel rail on the engine. There is a test port there, called a shraeder valve (?sp?).
There are specs for every vehicle, I don't know yours, but probably 50 psi, or maybe slightly higher.

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Have a 2005 f150 4.6 that stalls can it be the fuel pump is weak


Could be a fuel pressure regulator not working. Thus ecu complaining about fuel Pressure. probably not enough because the regulator is worn and leaking down so will not maintain the proper pressure. You will need to google the make model and fuel pressure regulator to find it's location or library and repair manual. Otherwise, you need to measure the pressure and find the spec for the required fuel pressure. Probably somewhere around 120PSI

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Why does 1998 jeep Cherokee not run unless gas tank is at least half full?


2.5L or 4.0L? engine.
ever do a full service on this car , with a fuel filter.
or wrong gas cap, does car run ok cap off? or loose?
ignore cap off DTC errors. EVAP errors when done, ok?
start with basics.
then check fuel pressure, with a 1/4 tank, is it spec pressure with that brand new filter? yes/no.

the filter is part of the top of pump at top of the FP reg. in tank.
that be how its done. no need to guess. at all.
in this case, the pressure test is after, the cap checks.
the wrong cap will have a missing, cap vacuum breaker this cause
the pump to fail (it cant suck in a hard vacuum at all, get a new cap)

FSM spec, a the fuel rail for pump pressure,
Start the vehicle and note the pressure reading at idle which should be 31 psi (214 kPa).

if the car stalls with 31 PSI pressures , its NOT THE PUMP.
easy huh? just one tool and bam ,hard cold diagnostic facts.
evidence.
the tool can be had for $20

Oct 01, 2014 | 1998 Jeep Cherokee

1 Answer

Why does Pontiac Montana stall at low idle? Why is it difficult to start once it's warmed up?


Might have your fuel pressure checked. You should have about 45lbs of pressure at the fuel rail.

Sep 02, 2014 | Cars & Trucks

1 Answer

99 chevy tahoe, 5.7 starts and idle fine, slowly give it gas it accelerates, step on the gas and it faulters, stalls sounds like it will die and bogs down


I have seen this type of problem before, this sounds like the engine is not getting the correct amount of fuel pressure it needs as you accel.the first thing is to remove the fuel filter and replace it, take the old filter and blow into it, this will tell you if its restricked. the next step will be to check fuel pressure, you will need a gauge for this test, hook up gauge at valve on the injector rail, take caution wear safty glasses as fuel is under pressure and will spary out a little as you connect line for the gauge to fuel injector rail valve, you will run the engine and also step on gas pedal as you watch the pressure, i would rev the engine to around 3000rpms and hold it to see if engine tries to stall or buck when it begins to act up look at the gauge and if the pressure drops as it starts to act up then the fuelpump is bad. its not able to keep up the pressure. start there good day.

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3 Answers

Starts then stalls out after idle then doesnt start at all no gas in the valve by the fuel rail to check for gas pressure is this for sure a fuel pump or maybe just a really bad filter from running it...


the way a electric pump works is the pump uses the gas to keep its self cooled so when you run the car out of gas or low on gas it gets hot and has to work harder but hey what can u do when your broke. that valve on the fuel rail u can use to tell if you getting fuel have someone turn the ignition on and push the valve in if you get no gas then check the interia switch if that switch is tripped it will shut off power to the pump a blown fuse or bad relay can do the same. if all is good there take the bule line off and see if you can get gas to come out there but be careful to not get gas in your eyes if you get gas out there then the filter is plugged if no gas comes out then you got to replace the pump.

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1 Answer

1995 pontiac grand am starts doesnt stay running wen pedal pushed


sounds like it is not getting much fuel. when you step on gas pedal to call for more fuel, its not there so it will quit. check fuel filter to be sure it is ok! have a good day!!

Jul 18, 2010 | 1995 Pontiac Grand Am

1 Answer

1988 chev celebrity stalls when comming to a stop sign.


no timing belt on the particular vehicle. but yes probably something minor, check fuel pressure, fuel pressure regulator, MAF sensor and IAC motor. all these can cause intermitent stalls. The MAF is located somewhere between the air filter and the throttle body. it is a sensor that sometimes gets dirty with air particles and will affect fuel managment. the IAC motor is on the throttle body and if gets stuck with carbon will not be able to control idle. the fuel pressure regulator is on the fuel rail and if the vacuum line is filled with gas then the diaphram is bad. and the fuel pressure should be 35 to 50 PSI running.

Mar 18, 2009 | 1988 Chevrolet Celebrity

2 Answers

85 740 GLE Non-turbo stalls when put in gear or push on accelerator


Its really sounds like the throttle switch, chack him.

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