Fuel pressure regulator

[ziembic]

My AFPR leaks down vacuum fairly quickly. Is this a problem?

The only thread I found in search is this one but it is not 100% clear.
http://www.syty.net/forums/showthread.php?t=1330&highlight=afpr+vaccum+leak


Thanks

 

[GM TURBO]

Re: Fuel pressure regulator

Leaks vacuum or leaks fuel pressure?

Eh - both are a problem.

 

[ziembic]

Re: Fuel pressure regulator

Leaks vacuum or leaks fuel pressure?

Eh - both are a problem.

leaks down vacuum.

 

[ziembic]

Re: Fuel pressure regulator

Bump, should I replace this AFPR or is it ok?
Thanks in advance,

 

[SY2932]

Re: Fuel pressure regulator

How old is the AFPR? Sounds like you may have a bad diaphram.

 

[ziembic]

Re: Fuel pressure regulator

How old is the AFPR? Sounds like you may have a bad diaphram.

I think it is about 5 years old, but only has about 1000 or so miles on it. How would I test to see if it is in fact the diaphragm?

I would also like to thank you for donating (I think) the propshaft bolts for the raffle at nats. I won them, and hope to use them when I convert to a 4L80E.

 

[The Devils Own Chariot]

Re: Fuel pressure regulator

Check the stem on the FPR to make sure its tight. Mine was lose and it leaked.

 

[SY2932]

Re: Fuel pressure regulator

I think it is about 5 years old, but only has about 1000 or so miles on it. How would I test to see if it is in fact the diaphragm?

It's pretty straightforward. Remove the vacuum line and see if there is gas inside it. If the diaphragm has been compromised not only will it leak vacuum, it was also leak fuel into the top of the AFPR:

The presence of fuel in the top of the AFPR is a dead give away that the diaphragm is shot...