Fuel Pressure Regulator keeps failing
 

I'm on my 4th one now. Any ideas why?

I've discussed with Marc H and he has never heard of this problem. When it fails, it leaks fuel back through the vacuum line, into the plenum, and all over the floor.

I'm changing the vapor canister just because, and I also put a new gas cap on.

Re: Fuel Pressure Regulator keeps failing
 

wondering if you know how this regulator works?i had a different style on my '91 L98..no vacuum..i swapped it out for an adjustable on from midamerica..c4koh noticed that the vac line on mine had come off, i didnt notice much difference when i put it back in place..of course i think i have a large secondary vacuum leak which may be affecting fuel pressure regulator..

Re: Fuel Pressure Regulator keeps failing
 

What fuel are you running and anything you are putting in it?

Re: Fuel Pressure Regulator keeps failing
 

Wonder if your return line is blocked causing high pressure???

Re: Fuel Pressure Regulator keeps failing
 

I use Conoco 91 octane exclusively. Almost any other fuel and it will ping. I don't use any other additives.

Re: Fuel Pressure Regulator keeps failing
 

I was wondering about that too. Is the return line a direct shot back to the tank ?

Re: Fuel Pressure Regulator keeps failing
 

Wonder if the canister is pushing gas into the intake and not the regulator

Re: Fuel Pressure Regulator keeps failing
 

I'd wonder if it has anything to do with the fuel rail?

Is that connection not tight enough?

:cheers:

David

Re: Fuel Pressure Regulator keeps failing
 

When you put a fuel gauge on the rail does it hold pressure or bleed off? Ever test Fuel Pressure under load??

Re: Fuel Pressure Regulator keeps failing
 

Re: Fuel Pressure Regulator keeps failing
 

It holds pressure. I've not tested it under load other than at idle.

Re: Fuel Pressure Regulator keeps failing
 

The fuel rails have been off several times. I don't think they are the issue.

Re: Fuel Pressure Regulator keeps failing
 

Can you get a vid of the gas dripping out of the FPR vac port nipple?

Re: Fuel Pressure Regulator keeps failing
 

It's fixed now. I just want to keep it from happening again

Re: Fuel Pressure Regulator keeps failing
 

Cool.

But exactly what was going on there? Where was the fuel coming from?

Knowing what might happen with others is good yUp!

Re: Fuel Pressure Regulator keeps failing
 

The FPR is failing internally, allowing fuel to move from the supply side back into the plenum through the FPR's vacuum line.