No fuel pressure when car is turned off?

[turborebel]

My fuel pressure goes to 0 psi when the car is not running. Is this normal or should it always stay pressurized?

Thanks,

Brent W.

 

[Avionixx]

While I wouldn't call it normal, it really doesn't do any harm. When I first installed my Walbro and AFPR, I would have residual fuel pressure for a half an hour, but now it goes instantly to zero. I think if anything, I just have to crank for an extra second or two.

 

[luv2rallye]

It normally stays presurized for hours. If not your FPR is probably leaking it back to the tank or your gas cap isn't making an air tight seal (replace it or replace the gasket on it).

 

[turborebel]

So, it has nothing to do with the fuel pump?

Brent W.

 

[luv2rallye]

The FP could have a stuck open check valve in it if sharp drop. If more gradual drop suspect FPR or leaky injector.

 

[turborebel]

Thanks for your answers. I just changed my fpr to a Aeromotive unit and it still goes down to 0 psi within 10 minutes. I have ordered a new Wallbro 255 and just received new
FIC 750s. Once they are in I'll tell you if it helped.

Brent W.

 

[blueninteytwo]

leaky injector rings... a leaky lower seal used to do that to me( the car would take like 5-6 seconds to turn over), they tend to get brittle and crack real easy. ended up replacing mine not too long ago...

 

[spyderturbo007]

It could also be that you crushed the O-ring on the top of the pump when putting the assembly back together. That happened with mine, but I'm too lazy to pull the pump again.