fuel pressure is 15 psi what to do

fuel pressure is 15 psi what to do

Postby bogdan84 [OP] » July 19th 2009, 6:15am

hello my Chevy astro dies. when i check the fuel pressure it was 15 psi and i find out that i need 60 to start. i change fuel filter and it steel the same and when i turn key in on position the fuel pump start pumping. does any one know the problem. and how to solve it? and if i neet to replasce the fuel pump can you tell me if i need to take of my tank? i got Chevy astro 1994 passenger thank you very much.
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Re: fuel pressure is 15 psi what to do

Postby Matrixx » July 19th 2009, 7:03am

Hi bogdan84

Welcome to the Forum

You have 2 different engines for that year.
VIN W (CPI) which needs 55-62 PSI fuel pressure
and
VIN Z (Non-CPI) which needs 9-13 PSI fuel pressure

We need to find out what "type" of motor you have in your vehicle (W or Z).

You can find this out by looking at the "8th Digit" on your VIN Plate located on the drivers side corner of the dash. You can only read that VIN plate from the outside looking through the front wind shield. Count 8 digits from left to right and what "letter" do you have stamped in that VIN Plate.

Please let us know when you can, Thanks.:)
96-GMC Safari - Rwd - Original Transmission - Exhaust - Air Cared - 3.73 Limited Slip Rear End - Motor Replaced - 91 octane (Chevron) for the last 14 years - MFI Upgrade - 640,000 Kilometers.
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Re: fuel pressure is 15 psi what to do

Postby bogdan84 [OP] » July 19th 2009, 8:14pm

yes i checked vin nummber and i got w so what it can be?
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Re: fuel pressure is 15 psi what to do

Postby Matrixx » July 20th 2009, 2:13am

Hi bogdan84

If it's the W motor with that amount of pressure, check the harness connections (the ground wire as well). The plug-in (wiring harness) you need to look at is under the van just before the fuel tank. This information is based on what you have replaced already.

Check the "Gray" wire for 12 volts which it must have to run the pump properly. Also check the ground connection the runs off that harness to the frame rail of the vehicle, make sure it isn't corroded and has a good ground contact at that bolt that holds the wire onto the frame rail.

This area needs to be looked at (wiring harness) "before" the fuel pump replacement to make sure the problem isn't in this area as well. If your getting 15 PSI with the ignition "on" and engine "off" after replacing the fuel filter and checking the wiring harness, then replace the fuel pump at this point.

I hope this helps. Please keep us updated, Thanks.:)
96-GMC Safari - Rwd - Original Transmission - Exhaust - Air Cared - 3.73 Limited Slip Rear End - Motor Replaced - 91 octane (Chevron) for the last 14 years - MFI Upgrade - 640,000 Kilometers.
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