Fuel pressure question
Thread Starter
Pro
Joined: Apr 2000
Posts: 589
Likes: 3
From: Acapulco Guerrero
Fuel pressure question
Hi,
please help me
Today I check my fuel pressure and is ok, but I note a diferent thing.
fuel pressure is 42
question,
do the system mantains the pressure at 42 or drops ?
because I opened the switch and the fuel pressure climbs to 42 but I turn off the engine and the fuel pressure drops completely.
Do this is nomal ?, I believe that not.
let me know your opinion
regards
please help me
Today I check my fuel pressure and is ok, but I note a diferent thing.
fuel pressure is 42
question,
do the system mantains the pressure at 42 or drops ?
because I opened the switch and the fuel pressure climbs to 42 but I turn off the engine and the fuel pressure drops completely.
Do this is nomal ?, I believe that not.
let me know your opinion
regards
Le Mans Master
Joined: Jul 2002
Posts: 5,818
Likes: 2
From: Alive and well in Burlington NC
Re: Fuel pressure question (Eduardo L98 1991)
Your fuel pressure appears to be fine, however, the fuel system should maintain pressure for some time after shutdown. Could be leaky injectors, bad fuel lines, fuel pump. Check the lines first.
Burning Brakes
Joined: Mar 1999
Posts: 858
Likes: 5
From: Fl,USA
Re: Fuel pressure question (Steel Blue 91)
Remove filler lid to get to return lines at tank. Pinch off return line and look at gauge. If it stays up regulator is leaking by. If it continues to drop pinch off feed line also. If it stays up pump is bleeding back. If it continues to drop 1 or more injector is leaking. You will probably have to keep turning the key on between these steps to re-pressurize the system. Might need a helper to turn the key on an off while your at the tank.
Hope this helps.
Mine wasn't holding pressure and it turned out to be a groove worn in the seating surface (face)of the regulator. I polished it with 300 grit , cleaned it and put it back in. That did the trick. Autozone sells regulator diaphrams for $22.00 I believe.
I hope this helps.
John
Hope this helps.
Mine wasn't holding pressure and it turned out to be a groove worn in the seating surface (face)of the regulator. I polished it with 300 grit , cleaned it and put it back in. That did the trick. Autozone sells regulator diaphrams for $22.00 I believe.
I hope this helps.
John
Thread Starter
Pro
Joined: Apr 2000
Posts: 589
Likes: 3
From: Acapulco Guerrero
Re: Fuel pressure question (Eduardo L98 1991)
Thanks for your answers
John 89
I already pinch the out line and the pressure continue drops, then I disconnect the return line and plug it with a bolt and clamps and the pressure mantains, then I supose was the regulator
Mantains but after some mins drops a little each time (very little).
Then tomorrow I will bought the regulator and the plenum gaskets
I apprecciate if somebody give the chevrolet part numbers
I will take out the fuel injectors and clean it and test it each by each and I will replace the o rings.
thanks, please help me with the part numbers the guy of the spare parts (chevrolet) is very stupid in the computer and I don´t have the cd or factory manual.
John 89
I already pinch the out line and the pressure continue drops, then I disconnect the return line and plug it with a bolt and clamps and the pressure mantains, then I supose was the regulator
Mantains but after some mins drops a little each time (very little).
Then tomorrow I will bought the regulator and the plenum gaskets
I apprecciate if somebody give the chevrolet part numbers
I will take out the fuel injectors and clean it and test it each by each and I will replace the o rings.
thanks, please help me with the part numbers the guy of the spare parts (chevrolet) is very stupid in the computer and I don´t have the cd or factory manual.
