Wanted to post and let everyone know of another example of an Aeromotive Fuel Pressure Regulator going bad.

I maybe had 4,000 miles on this regulator and it's bad. The car wouldn't hold fuel pressure, it would bleed off and it was going lean in the high RPM's. Swapped out for a GM Fuel Pressure Regulator and all issues are gone.

Don't Buy This Thing, Not worth the money.

 

got mine off my parts car, unsure of how many miles on it before i put it on my car, but so far so good. if FP starts acting up ill look into that first

 

I've had two Aeromotive regulaors fail. Diaphram will not hold up and leaks. Both were the "end of rail" mount type. Machined the rails and did a remote regulator (large size). The end of rail location is not very accessable for adjustment. Aeromotive seam to fail every 2 to 4 years. Aeromotive does not sell parts, so, your out @least $135 evry time for an new unit. That part can't cost them $10 dollars. App...97ss 383 D1 M6 twin Walbro 255lph. Greed is good???

 

send it back they will rebuild it.

 

I am having the same problem. I have a '95 Camaro with a 383 Stroker with 36 pound injectors, a high volume fuel pump and that Aeromotive Fuel Pressure Regulator. Just the other night, My wife , Daughter and I went for a New Years Day cruise around town. Everything seemed O.K. for awhile at least. When I pulled into the In 'n Out Hamburger joint to get something to eat, we came back to the car and it would not start. I opened the fuel cap to relieve the pressure and alot of pressure was surely in there. After sitting there for about a half an hour, it finally started up and we were able to make it home O.K. This is not the first time it happened, it has happened before on many occassions fortunately, my family wasn't with me. Is there another brand fuel pressure regulator that is on the market that will do the job better with no issues? You said you went and purchased a GM Fuel Pressure Regulator and all issues were gone. Will that work just as well with my set up? If so, can you direct me in the right direction to purchase a better Fuel Pressure Regulator?

 

all you ever need on 90% of these cars is the stock one...

 

Will the stock one work on a modified engine? Mine is a 383 Stroker with a high volume fuel pump and 36 pound injectors. Will the stock Fuel Pressure regulator work better than this Aeromotive piece of crap? If so, then I will switch back to my stock one.

 

yes.....

it boils down to this....I will keep it simple as possible....

injectors are rated for xx.xx @ xx PSI

increase the PSI you increase the flow of the injector because your pushing more fuel to it.

PCM has constants in it for everything else to work around...like injector size. You increase the pressure you throw everything off anyway thats in the tune.

If that makes any sense to you.... I can't explain this stuff very well, but it goes back to what it was tuned for, more than likely it was tuned to 43.xx psi...stock pressure. So go back with the stock regulator.

 

I'd like to know what failed in it. There's like 3 parts in there and not a lot to go wrong. Early regulators had the diaphragm fail but that was fixed with a better material. Maybe the design leaves something to be desired, but if it is broken, it should be easy to point out just what failed in it.

 

Why are you thinking the pressure build up in you fuel tank could be caused by a faulty regulator?

Ken R.

 

I've had two (2) Aeromotive LT1 type regulators fail. Both the diaphram failed and leaked. So, I dissected. Most times the diaphram material becomes pourous and leaks. Also a second failure point is the center upset-rolled aluminum seam that holds and seals the diaphram disc. If only Aero_M would sell parts for these. So, I completely modified my rails for a larger regulator, which, really works better now and easy to adjust (not in the back). I found a Trick-Flow reg from Summit. Out of the box and it had..."by Aeromotive." You know, I can't get away from these guys. Magna flow next. I run 72# peek-n-hold injectors @ around 43psi. I'm thinkin the stock regulator is the best as previously commented.

I tried making my own diaphrame with limited life success. I have trouble finding suitable diaphram material. That is the only problem. The diaphram requires a web support structure to distribute radial stress to prevent elastic seal material failures under pressure.

B.

 

Should just be a sticky that say DONT BUY AM FPR.... Had the same problem, cant tell you how many others have as well...

 

That really blows that they wont sell you the parts, but also that they failed in the first place. I have a Magnaflow now, but my Aeromotive lasted 5 years without a hitch. I still have it and I may take it apart to look at the diaphragm and see what it looks like.

- OK I opened it up and looked at it - looks like it got kind of curly and deformed the moment I took it out. No leaks or obviously bad areas but doesn't look like new either. Kind of reminds me of the Holley accellerator pumps from back when i used to work on those.

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Buy a Fuelab regulator and be done w/ it. I don't know why people keeping buying Aeromotive when they know their regulators fail on a constant basis.

 

I've contacted Fuelab about their regulators, but i wasnt sure which one I need. What part# is yours? Will I need any adaptors/fittings?