Fuel pump
Thread Starter
Heel & Toe
Joined: Jun 2016
Posts: 24
Likes: 0
From: Virginia
Fuel pump
Here's my situation. I hooked up a pressure gauge to test the fuel pump. Turn on the key pressure goes to 42 then zero immediately. The car starts and pressure is 34 when running. The FSM states that this a bad check valve. Is this check valve built into the fuel pump?
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
34lbs is very low. that is barley enough pressure to supply the injectors. the pessure should be 40 - 43. however, you are lacking the platform & year.
Last edited by THE 383 admiral; Jul 13, 2016 at 09:50 AM.
Thread Starter
Heel & Toe
Joined: Jun 2016
Posts: 24
Likes: 0
From: Virginia
Yes. the check valve is built inline within the FP. IT is NOT needed. but changes the way you start. most High performance FP do NOT have this check valve. the motor has more power that easily fulfills the prime shot.
34lbs is very low. that is barley enough pressure to supply the injectors. the pessure should be 40 - 43. however, you are lacking the platform & year.
34lbs is very low. that is barley enough pressure to supply the injectors. the pessure should be 40 - 43. however, you are lacking the platform & year.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
This would be a Black 87? Check fuel pressure regulator for fuel leaking at vacuum port. Is there a particular condition your are concerned about? 42 is at the low end of the spec. Fuel pump is in tank. If pulsator is present it should be removed and hose installed in its place, it is not needed.
Thread Starter
Heel & Toe
Joined: Jun 2016
Posts: 24
Likes: 0
From: Virginia
This would be a Black 87? Check fuel pressure regulator for fuel leaking at vacuum port. Is there a particular condition your are concerned about? 42 is at the low end of the spec. Fuel pump is in tank. If pulsator is present it should be removed and hose installed in its place, it is not needed.
It turns over a little more than it used to, although I hardly ever drive it, but I thought I'd check the pressure and noticed it didn't hold pressure. I replaced the pump about 5 years ago. Sounds like it's time for another one. Yes. Black 87.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
If you block return line at tank and fuel pressure jumps above the 42 and holds you may want to think about regulator. If you replace pump do fuel filter while you have things apart. Of course driving it like you stole it occasionally makes for a happy engine
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
Let's do something like testing before throwing parts at it, shall we?
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Thread Starter
Heel & Toe
Joined: Jun 2016
Posts: 24
Likes: 0
From: Virginia