Losing fuel pressure after shutoff

[TunedUp]

Okay so I have searched high and low for two weeks and haven't found any help so as a last resort decided to make a post. I installed Walbro 255, FIC 750cc injectors, and a fuel lab afpr and now when I turn off my car my fuel pressure drops to zero in about 10min according to the afpr any ideas?

 

[inthemidst]

The check valve inside the fuel pump could be leaking out all the pressure.or your fuel pressure regulator isn't holding the pressure.

 

[pauleyman]

Or you have a leaky injector.

 

[TunedUp]

How can i tell if the fuel pump is leaking down the pressure? The pump is brand new I hope nothing is wrong with it.

 

[inthemidst]

Get some vise grips and clamp the fuel return line if the pressure drops its the pump if it doesn't its the regulator .

 

[TunedUp]

Okay I will try that tomorrow thanks inthemidst. And Pauley the injectors are brand new what do you mean they could be leaky? Like after shut off the leak fuel into the cylinders? If that's the case is there a way to fix it or get a new injector?

 

[Dsmkauai]

Since you just changed pumps did you use the old top hat thing? What about oring for top? If those are cracked or not sitting in right it can cause your exact problem.

 

[keltalon]

Okay so I have searched high and low for two weeks and haven't found any help so as a last resort decided to make a post. I installed Walbro 255, FIC 750cc injectors, and a fuel lab afpr and now when I turn off my car my fuel pressure drops to zero in about 10min according to the afpr any ideas?

One test you can do to rule out the fuel pressure regulator is to crimp the return line on the bottom of the fuel pressure regulator and see if it stay up if it does not drop then its your regulator, if it drops then more than likely its your injectors. let us know thanks.

 

[TunedUp]

Sorry haven't been able to work on my car since I've been working all the time. Hopefully tomorrow I can get over to my buddies and check things out finally.

 

[TunedUp]

Sorry it's been a while since I could work on my car I detached my labral tendon in my shoulder. I did however have a buddy work on it for me and we found the issue was my injector o rings that go into the port weren't down all the way. Thanks for all the help fellas.