1987 Fuel Pump Question
Thread Starter
Heel & Toe
Joined: Jul 2012
Posts: 19
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1987 Fuel Pump Question
From a couple of Utube how-to videos, there was reference to a check valve in the fuel pump assembly that was there to hold pressure in the line after the pump was turned off. So, the question is: Exactly where is this check valve located? Is it part of the pump (requiring replacement of the pump to correct the problem) or is it in the fuel pump supply line somewhere?
Thanks,
Thanks,
Le Mans Master
Joined: Mar 2004
Posts: 5,107
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From: Dublin CA
It is inside the pump. If you put a fuel pressure gauge on the rail and prime the system (turn the key to the on position for 5-10 seconds). Your pressure should go to 36-39 PSI and stay there. If it drops to zero in seconds you check valve is probably bad...or you have a leaking injector. If it a leaking injector your going to start to find fuel in the oil.
Race Director
Joined: Mar 2015
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[QUOTE=John A. Marker;1590304894]It is inside the pump. If you put a fuel pressure gauge on the rail and prime the system (turn the key to the on position for 5-10 seconds). Your pressure should go to 36-39 PSI and stay there. If it drops to zero in seconds you check valve is probably bad...or you have a leaking injector. If it a leaking injector your going to start to find fuel in the oil.[/QUOTE
but it could also be your fpr pull the vacumme line off and smell for gas. The after market pumps don't hold as well as the originals. 
but it could also be your fpr pull the vacumme line off and smell for gas. The after market pumps don't hold as well as the originals.
Thread Starter
Heel & Toe
Joined: Jul 2012
Posts: 19
Likes: 0
Thanks
Your recommendation was right on. A new fuel pump took care of the problem.
Many thanks for your help.
Gary
[QUOTE=antfarmer2;1590305246]
Many thanks for your help.
Gary
[QUOTE=antfarmer2;1590305246]
It is inside the pump. If you put a fuel pressure gauge on the rail and prime the system (turn the key to the on position for 5-10 seconds). Your pressure should go to 36-39 PSI and stay there. If it drops to zero in seconds you check valve is probably bad...or you have a leaking injector. If it a leaking injector your going to start to find fuel in the oil.[/QUOTE
but it could also be your fpr pull the vacumme line off and smell for gas. The after market pumps don't hold as well as the originals.
but it could also be your fpr pull the vacumme line off and smell for gas. The after market pumps don't hold as well as the originals. 
