Any help is appreciated. I did not mean to sound rebellious or whatever lol.

I have a new Holley AFPR on the way..if it still leaks I will just sell one of them.

 

Not a problem; just teasing.

I'm following your progress and asked a few questions after reviewing the exploded (Oops, bad choice of words, LOL) FPR link you posted. Did you see them?

Jake

 

The diaphragm is the correct diaphragm for the Holley unit. I am not sure how old it is, but it appears to be in perfectly good shape. I can't see any tears/pinholes in it.

I did install the diaphragm with the biggest end up (the part where the spring seats against the diaphragm.)

I wonder if my problem is with the fuel rail? Something with the mounting block for the FPR?

When I discovered this leak I removed my injectors from their ports like you stated above and was waiting to see them just dump gas out but when they didn't I was shocked/depressed.

The new unit should be here on Thursday, I will post an update then. Either way one of the Holley's will be for sale

 

Too bad they won't fit my son's LT1 because he's in the market.

Jake

 

Found my problem. The picture below is not mine, its from the thirdgen thread.

My diaphragm has the bubble. Reading this thread is making me second guess installing another one of these regulators.

http://www.thirdgen.org/techboard/at...s-dscf0013.jpg

http://www.thirdgen.org/techboard/af...-afpr-pos.html

Another witness thread: http://www.thirdgen.org/techboard/tp...fuel-pump.html


Pictures of my diaphragms, the stock one looks like crap and as you can see the holley one has the "bubble"

Pretty sure I won't be selling either of the regulators now, I don't want to be the cause for a car fire because I sold somebody a bad part. If the new one leaks I will call Holley and demand a refund. I don't want another one of these if they just keep leaking.

 

Here's the update.

New Holley AFPR installed, and....


All is well. Fuel pressure is holding at 42 PSI, what I set it at. The gauge didn't even move yet so there are no leaks anywhere and its been about 5 minutes since I primed the fuel rail.

Awesome. Lets just hope that this one holds out longer than its brother did. If it fails I'm going to go to a Kirban AFPR that people on TGO are using.

 

Huge pressure drop to none, that's excellent news!

 

Don't hold your breath...

I just reinstalled the fuel rail onto the manifold and put the drivers side set of SR runners on. Primed the rail, and guess what? Pressure drop. I'm calling Holley.

The feel between the stock style diaphragm and the Holley diaphragm is noticeable. The holley doesn't really feel like rubber, and its thinner. I read somebody on TGO used a stock style diaphragm with a Holley regulator...

From Holley Customer Service:

"It sounds like you got one of the regulators with the bad diaphragms, just call summit tell them you spoke with us and they should send you another one"

I asked if I was going to get another one that was bad, and he stated...

"You should be alright with the next one you receive, as far as I know there aren't very many that are defective, it is pretty rare, about one in thousands of them built"

Bull****, I have TWO and both of them leak.

 

About time to totally dump HOLLEY, right? Enough is ENOUGH!

I'd get a different brand from TPIS or ECKLERS and be done with it.

Jake

 

I used a stock diaphragm with a TPiS regulator. No issues.

 

I'm having similar fuel pressure loss issues and have not been able to correct it. Using the shop manual diagnostics, I've isolated the pressure loss at the regulator where the little disc seats on the FPR base. The diaphram, although probably original, was not leaking fuel. I replaced the diaphram with a new one - certain the problem was resolved but nope...exact same pressure loss. I'm contemplating going back for a new diaphram, but doubtful that this will change things. I inspected the seat on the FPR base when I was changing diaphrams and could not identify even the slightest possibility that the seat had any issues.

I'm thinking that if/when I go in to the FPR again, I'll try a new base - but these are hard to find new and a crap shoot at the best if trying a used one - unless the previous owner knows for sure that it was working fine - and recently.

Bottom line - apart from the fast drop in pressure after priming, (i.e down to about 5-10 psi in less than 30 seconds), the car runs and performs just fine. Fuel pressure is about 36-38 psi when the car is running. Occassionally, I'll have a 3-4 second crank over before it fires ups, but usually it fires up as soon as I hit the key. It just bugs me that I can't get the pressure to hold near the 35 - 38 psi immediately after the prime.

 

Bottom line - apart from the fast drop in pressure after priming, (i.e down to about 5-10 psi in less than 30 seconds), the car runs and performs just fine. Fuel pressure is about 36-38 psi when the car is running. Occassionally, I'll have a 3-4 second crank over before it fires ups, but usually it fires up as soon as I hit the key. It just bugs me that I can't get the pressure to hold near the 35 - 38 psi immediately after the prime.


From personal experience on my 86, if the pressure loss is occuring at the pump, it's not a problem. Yea, it may not hold as long as Id like, but it didn't really matter. I found absolutely NO negative side effect from the pressure leak at my fuel pump - what's that thing called - pulsator? I just replaced it with a length of fuel hose and drove off into the sunset fat, dumb and happy. LOL

But, if the loss is occuring in the engine bay, that's different. That has to be fixed. There are only a few places where that can happen and the most common are the regulator and/or the injector(s).

Line, connections are next on the list, but I'm sure you'd have seen/smelled that by now.

To me, there are things to worry about and things not worth the trouble. Knowing the difference is the key.

However, in your case you need to first find out which end of the car you're dealing with and go from there. If it's in the engine compartment, buy an complete new regulator from someplace like ECKLERS, CORVETTECENTRAL, MID-AMERICA, etc. Bolt it on and avoid all the problems you've been readng about here.

Jake

 

Well now I need a stock diaphragm and an adjustable regulator housing...which will probably end up being more expensive than the Holley unit was in the first place. I am returning the one I just bought from Summit.

Where can I get a stock style diaphragm instead of from TPIS? I don't want to wait a year and a half to get it, i want this thing running now

Edit: Jake, that post was within seconds of mine, thanks for answering my question before I asked it lol.

 

Jake - can you explain why you think that a FP leak at the pump is not a problem while a FP leak down at the regulator is? If you are suggesting that a FP loss in the engine bay is somehow external and poses a risk of fire, yes - of course, I agree (but that is not the case, here). Wouldn't an abnormal but equivalent pressure loss at the *front* or the *back* amount to the same thing?

What am I missing?

 

ECKLERS, www.ecklers.com 1-800-327-4868 Buy a complete new unit; haven't you had enough aggravation yet?

Jake

 

Leaks at the engine foul the plus; effect A/F ratio, confuses the 02s.

Rather than guess or rely on opinions, ECKLERS Page 94 long hose FP Gauge $49.99 and see for yourself. www.ecklers.com 1-800-327-4868.

Testing always best.

Jake

 

Just noticed that TPIS is based out of MN, which is right next to me. I am going to order through them, its cheaper than Ecklers too.

 

Was that pressure drop there with the fuel supply line pinched ?

 

I've been pricing diaphragms and TPiS is not only recommended by FIC, they are also the most inexpensive ones. I can't even find a better deal on eBay.

 

Yes sir it was, fuel line was pinched.

That thread I posted on TGO also showed somebody had a diaphragm last less than 5 minutes.