Car runs...gauge says 0 PSI

jonrhy05 · August 25th, 2011, 12:53 PM

car has had idling issues (no vac leaks, TPS is set, etc), so i decided to check fuel pressure to see if its losin pressure. hook a gauge to schrader valve, turn key on, 0 psi...start car, 0 psi. however, the car has plenty of power and runs fine.

thought maybe the gauge was bad...worked fine on another car immediately afterwards. tried mine again, same thing

so, whats the deal?

richardhales · August 25th, 2011, 05:28 PM

is any fuel coming out of the valve when you push on the nipple? if not the schrader valve is probably bad

jonrhy05 · August 25th, 2011, 10:10 PM

yah...how much should

ryanw · August 26th, 2011, 01:58 AM

Im also going to say that the schrader valve is probably bad. it may be a little bent to the side not alowing the gauge to push schrader valve in. I see this all the time with A/C system.

jonrhy05 · August 26th, 2011, 07:39 AM

i thought that too, i removed the core out of schrader valve to allow it to openly flow out

jonrhy05 · August 26th, 2011, 09:02 AM

could a hole in fuel line cause it to lose pressure but still have enough to run the car??? or is it more than likely gettin enough pressure and its just an issue with schrader valve?

ryanw · August 26th, 2011, 07:34 PM

have you ran your codes yet ? see if there are any fuel related codes that pop up. but i cant see a car running with 0 psi. my car ran like crap on 18 psi

jonrhy05 · August 26th, 2011, 10:28 PM

fixed the problem...the core inside the schrader valve was broke, took one out of a tire and fixed it.

ryanw · August 26th, 2011, 11:29 PM

good to hear you fixed it. Your fuel pressure should be some where around 39 psi. But that is with the vacuum line pulled off the fuel pressure regulator. and the vacuum line caped

August 25th, 2011, 12:53 PM	#1
jonrhy05 Regular Join Date: Feb 2010 Posts: 87 iTrader: 0 reviews	Car runs...gauge says 0 PSI car has had idling issues (no vac leaks, TPS is set, etc), so i decided to check fuel pressure to see if its losin pressure. hook a gauge to schrader valve, turn key on, 0 psi...start car, 0 psi. however, the car has plenty of power and runs fine. thought maybe the gauge was bad...worked fine on another car immediately afterwards. tried mine again, same thing so, whats the deal?

August 26th, 2011, 01:58 AM	#4
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	Im also going to say that the schrader valve is probably bad. it may be a little bent to the side not alowing the gauge to push schrader valve in. I see this all the time with A/C system. __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

August 26th, 2011, 07:34 PM	#7
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	have you ran your codes yet ? see if there are any fuel related codes that pop up. but i cant see a car running with 0 psi. my car ran like crap on 18 psi __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

August 26th, 2011, 11:29 PM	#9
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	good to hear you fixed it. Your fuel pressure should be some where around 39 psi. But that is with the vacuum line pulled off the fuel pressure regulator. and the vacuum line caped __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

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August 25th, 2011, 05:28 PM	#2
richardhales Newbie '06 Mustang GT Join Date: Aug 2010 Location: Olympia, WA Posts: 37 iTrader: 0 reviews	is any fuel coming out of the valve when you push on the nipple? if not the schrader valve is probably bad

August 25th, 2011, 10:10 PM	#3
jonrhy05 Regular Join Date: Feb 2010 Posts: 87 iTrader: 0 reviews	yah...how much should

August 26th, 2011, 07:39 AM	#5
jonrhy05 Regular Join Date: Feb 2010 Posts: 87 iTrader: 0 reviews	i thought that too, i removed the core out of schrader valve to allow it to openly flow out

August 26th, 2011, 09:02 AM	#6
jonrhy05 Regular Join Date: Feb 2010 Posts: 87 iTrader: 0 reviews	could a hole in fuel line cause it to lose pressure but still have enough to run the car??? or is it more than likely gettin enough pressure and its just an issue with schrader valve?

August 26th, 2011, 10:28 PM	#8
jonrhy05 Regular Join Date: Feb 2010 Posts: 87 iTrader: 0 reviews	fixed the problem...the core inside the schrader valve was broke, took one out of a tire and fixed it.

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