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  #1  
Old 07-26-2009, 07:59 PM
dieter dieter is offline
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fuel pump pressure specfications
What should the working fuel pressure be on a 1990 Buick 3800 engine?. Is there a special procedure to checking the pressure? Should one ever use compressed air to blow out the fuel line of possible foreign matter such as rust, specifically, from the fuel filter back to the tank (where the fuel pump is located)?

How can I get this answer directly to my email : [email protected] ?
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Old 07-26-2009, 08:24 PM
maxwedge maxwedge is offline
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Re: fuel pump pressure specfications
You need a fuel pressure gage attached to the port on the fuel rail (35-40) psi., I would not recommend blowing out the fuel lines, back to the pump.
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Old 07-27-2009, 10:01 AM
big white bufflo big white bufflo is offline
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Re: fuel pump pressure specfications
the fuel pump is located in the tank
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Old 07-27-2009, 04:31 PM
happydog500 happydog500 is offline
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Re: fuel pump pressure specfications
If we email you the answer, how will others reading the forums benefit?
Chris.
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1998 Buick Park Avenue (best car GM ever made)
Buick Lesabre 1997, 191,000
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Old 07-27-2009, 07:44 PM
maxwedge maxwedge is offline
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Thumbs up Re: fuel pump pressure specfications
Quote:
Originally Posted by happydog500 View Post
If we email you the answer, how will others reading the forums benefit?
Chris.
Agreed and that is the point of our forums!
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Old 07-29-2009, 12:12 AM
Jrs3800 Jrs3800 is offline
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Re: fuel pump pressure specfications
37-41 Psi is the general range for the Vin C 3800... A little lower or higher is ok..
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Old 07-29-2009, 12:44 AM
happydog500 happydog500 is offline
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Re: fuel pump pressure specfications
My fuel pump went out today. Have a big trip planned for Thursday.

104* highs don't help. I drove 15 miles home by turning the key a few times to get the pump to pump some gas. Started it up, drove and coasted. Did it all over and over again the the whole way.

Through town, I was stopped some time blocking traffic.

Chris.
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1998 Buick Park Avenue (best car GM ever made)
Buick Lesabre 1997, 191,000
152,000 - Motor R.I.P.
Used 111,000 Motor, All New Gaskets
Used 102,000 Transmission - SOLD
New Balance 662
Trek 8000
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Old 07-29-2009, 03:05 PM
Jrs3800 Jrs3800 is offline
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Re: fuel pump pressure specfications
Quote:
Originally Posted by happydog500 View Post
My fuel pump went out today. Have a big trip planned for Thursday.

104* highs don't help. I drove 15 miles home by turning the key a few times to get the pump to pump some gas. Started it up, drove and coasted. Did it all over and over again the the whole way.

Through town, I was stopped some time blocking traffic.

Chris.
Thats True... On mine I had noticed slight Ping from the motor... Had the scan tool on it and started watching knock counts and Knock Retard.. When I would run lean the knock counts would go through the roof and the KR was 6-10 Degrees iirc.. The PCM could no longer adapt to the lower fuel pressure... I was seeing as low as 30-32 at part throttle when it should have been at least 45 Psi.. At that point I changed out my fuel pump as this happened 1 week before my 1000 Mile road trip
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