Fuel Pressure Problems

5.0 from 95

Founding Member

Nov 6, 2001

738

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Emory, TX

May 4, 2008

#1

• May 4, 2008

• #1

I installed a fuel pressure gauge in place of the clock so I could maybe tell what is going on a little easier. I don't drive my car very often so it may sit for a week or more at times. Normally when I do go and start it, the fuel pressure is down to zero. First question is this normal after it sits for a while?
When I do drive it, I have noticed that sometimes when I stop say for a hour or so, when I go to start it back up the pressure is pegged all the way back to zero. I would guess in the 130 pound range. Why would this happen and is my fuel pump staying on?
Any help or directions on seeing if these are problems is appreciated.


Paul

 

T

tstang21

Member

Apr 14, 2008

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May 4, 2008

#2

• May 4, 2008

• #2

since you placed the guage on where the clock is, maybe its not getting any proper reading due to the lines. try checking them. maybe your gauge is off. it should be set at standby 32psi. correct me if im wrong though

 

hollywoodstang

Active Member

May 23, 2006

1,095

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36

May 4, 2008

#3

• May 4, 2008

• #3

Your fuel pressure go back to 0 after about an hour. this is because there is no fuel pressure in the fuel line. It is NORMAL. There is nothing wrong with your car.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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129

May 4, 2008

#4

• May 4, 2008

• #4

If you have an aircore gauge, sometimes the reading just kinda floats where ever it wants when there's no power to the gauge.

If your Schrader valve is still accessible, you can check pressure with another gauge and compare.
Or when the gauge is pegged, pull the FP fuse and turn the key to accessory. See if the gauge zeroes-out.

Good luck.

 

5.0 from 95

Founding Member

Nov 6, 2001

738

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0

Emory, TX

May 5, 2008

#5

• May 5, 2008

• #5

Thanks for the info. Just to clarify the zero thing. It goes past 100 and back around to 0. Not as in counting down to 0. I was just scared that the fuel pump was trying to stay on.


Paul

 

toyman

10 Year Member

Jul 19, 2007

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Vernon BC

May 5, 2008

#6

• May 5, 2008

• #6

5.0 from 95 said:

Thanks for the info. Just to clarify the zero thing. It goes past 100 and back around to 0. Not as in counting down to 0. I was just scared that the fuel pump was trying to stay on.


Paul

Click to expand...

Are you actually running a mechanical gauge in the clock pod? If it is this is not generally thought of as being a good idea IMHO even if you are using a braided line. The last thing you want is fuel spraying into the passenger area.

If not and it's an electric gauge it will start at zero and go to the fuel line pressure w/o vacuum (about 38 psi). Depending on the gauge it may well go through a self diagnostic check which could see the dial sweep full scale. This seems to be what you are describing.

 

5.0 from 95

Founding Member

Nov 6, 2001

738

0

0

Emory, TX

May 6, 2008

#7

• May 6, 2008

• #7

No fuel lines inside the car. They make a line that starts in the engine compartment and runs to the gauge that has a liquid in it. I am not sure what it is just that it there is no fuel. I think I am going to try and install another gauge on the schrader valve and watch it to see what it does compared to the one inside. Seems like the easiest suggestion to try so far. Thanks for the help.

Paul