11 replies to this topic

[Alberto]

Some questions on maintenance for adjustable fuel pressure regulators.  I have the Aeromotive Adjustable Fuel Pressure Regulator from Advanced for context.

 

Do the adjustable fuel pressure regulators require any periodic maintenance or rebuilding? 

How frequently should that be done?

What are the symptoms of the FPR requiring maintenance / rebuild?

How can I test that my current 9 year old FPR is working properly?

 

Thanks.

[FTodaro]

I do not have the answer for you as i have never rebuilt one just replaced one and that was about 8 years ago. So mine is about the same age as yours. I would be more concerned with the Fuel pressure gauge failing. the FPR  It has a rubber diaphragm and a spring. If that fails i am not sure if they make replacement parts for it, but I suspect its usable life is quite long.

[Steve Scheifler]

I do not have the answer for you as i have never rebuilt one just replaced one and that was about 8 years ago. So mine is about the same age as yours. I would be more concerned with the Fuel pressure gauge failing. the FPR It has a rubber diaphragm and a spring. If that fails i am not sure if they make replacement parts for it, but I suspect its usable life is quite long.

Not sure about that model but others do have replacement diaphragms available. I think theirs even work in the Chinese knock-offs which have been known to fail.

[ChrisA]

They can be rebuilt. You can order replacement Aeromotive diaphragms from Summit Racing. You should be able to find the correct part# on the Aeromotive website. If the diaphragm gets a hole in it, the FPR will leak. If you have gotten a counterfeit unit, there is possibility of internal corrosion of the FPR due to ethanol and poorly anodized aluminum. This could cause the diaphragm to stick and not adjust smoothly or properly maintain set pressure. Always, a good idea to have a spare diaphragm on hand, they aren't expensive.

[Jim Drago]

other than diaphragm going bad, not much else in there to fail. Replacement diaphragms are about $25-30

[Alberto]

Thanks fellas.  I'll try and find the model number so I can order the replacement parts just in case I need them.

[Ron Alan]

Some questions on maintenance for adjustable fuel pressure regulators.  I have the Aeromotive Adjustable Fuel Pressure Regulator from Advanced for context.

 

Do the adjustable fuel pressure regulators require any periodic maintenance or rebuilding? 

How frequently should that be done?

What are the symptoms of the FPR requiring maintenance / rebuild?

How can I test that my current 9 year old FPR is working properly?

 

Thanks.

Did you not listen last weekend when you asked me about this?    Basically what Jim said...

 

These were my symptoms when the diaphragm failed...car would start and run fine...even rev. The minute you tried to drive under load it stumbled...would not go. Had 15 lbs of FP at the Schrader valve at pump at idle. Could not increase pressure. Purchased replacement rubber diaphragm at Summit I believe. Now have a spare in the trailer!

[Dave D.]

How old were some of these regulators when they failed?

[Alberto]

Did you not listen last weekend when you asked me about this?     Basically what Jim said...

 

These were my symptoms when the diaphragm failed...car would start and run fine...even rev. The minute you tried to drive under load it stumbled...would not go. Had 15 lbs of FP at the Schrader valve at pump at idle. Could not increase pressure. Purchased replacement rubber diaphragm at Summit I believe. Now have a spare in the trailer!

 

I did.  But you are a sample size of one. 

You shared a failure mode.  I was curious if there were any symptoms of impending failure or general wear.  Guess that wasn't obvious in my initial post.

[Bench Racer]

As some have said the diaphragm failed. The diaphragm gets hard. Buy a diaphragm and compare old to new and I'll bet your 8-9 year old will be harder than the new one. CHANGE it!!!

[Ron Alan]

I did.  But you are a sample size of one. 

You shared a failure mode.  I was curious if there were any symptoms of impending failure or general wear.  Guess that wasn't obvious in my initial post.

There is a rubber diaphragm...thats it

But frankly I too had no idea what was involved...until I took it apart! If you are really really slow this will take 5 minutes...LOL

[FTodaro]

I have the same FPR so if you locate the replacement, post the part number and the source so we can follow up if need be.