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Wed Sep 11, 2019 6:35 pm

OK, what the hell?

I adjusted this a couple weeks ago down to 1.5psi for a Progressive carb. I look now, and it's back up to 3psi. You can see the adjustment is pretty much maxed out.

What. The. Hell.

I'm guessing it's toast, but I've never seen a FPR fail before. Pic below.

Wed Sep 11, 2019 6:38 pm

And yes, I know the throttle cable tube has popped. I'm gonna stick a hose clamp or something on the back side. Haven't decided how best to address it yet.

The progressive works great, but things like poor throttle placement make me consider throwing the duals on there. And I still might. They're on my 2180 right now, but I'm planning on going FiTech for that engine...

Wed Sep 11, 2019 6:45 pm

They sell rebuild kits but those chrome Holley regs suck.

Wed Sep 11, 2019 6:45 pm

Clean it out, maybe some crud in it holding it open. I always dead head the line when setting the psi.

Wed Sep 11, 2019 6:50 pm

Thanks. Any recommendations for a quality FPR? I'm running a "low pressure" rotary pump, but it still goes over 4psi if I'm not managing it.

Wed Sep 11, 2019 6:54 pm

What spring is in the Holley regulator? They offer 2 different springs in case you did not know. The "standard" spring is for fuel systems needing anywhere from 5-10psi. The less common spring is for 1-5psi as I recall. I'll check Holley or Summit to see if I find the part number.

Wed Sep 11, 2019 6:58 pm

the Holley 12-804 regulator has a range of 1-4psi. You need to make sure you have THAT regulator or the rebuild kit for THAT regulator.

As far as i know all those regulator housings are the same.

Wed Sep 11, 2019 6:59 pm

Really? Well, crap. You're gonna make me go out and work on the thing Saturday in 97 degree heat, aren't you? :evil:

This thing came on my 2180 with the dual brosols (no idea which ones at the moment) and it was running 3psi.

Wed Sep 11, 2019 7:00 pm

If that is a liquid filled pressure gauge, then it will change reading with increased engine bay temperature. If so that reading will only be accurate when you first start the car.

Wed Sep 11, 2019 8:09 pm

HBRag wrote: If that is a liquid filled pressure gauge, then it will change reading with increased engine bay temperature. If so that reading will only be accurate when you first start the car.

That pic was taken cold, engine off, with the electric pump on.

I got the same reading hot with the engine running.

Wed Sep 11, 2019 8:45 pm

Aeromotive makes a low pressure regulator made for 1.5 psi. Just under 200.00. Summit sells them. The holley ones suck.

Thu Sep 12, 2019 4:42 am

X2 on the Aeromotive :wink:

Thu Sep 12, 2019 5:13 am

I used a Malpassi regulator from CB works perfect and less than 1/2 the cost of the automotive fpr.

brad

Thu Sep 12, 2019 9:42 pm

never had a problem with those cheap holley regulators in a carb setup. the rebuild kits are not much like $14-$18 I would rebuild it and make sure everything it clean. also make sure you have the low pressure spring.

Thu Sep 12, 2019 9:51 pm

The rebuild kits are $9.99 and comes with both springs around here. I have 3 of those holley regs and haven’t had a problem yet. The insides are basically all the same, a diaphragm and a spring. The bigger the diaphragm, better.

Fri Sep 13, 2019 5:15 am

Rebuild kit was $13 including shipping direct from Holley.

Thanks everybody!

Fri Sep 13, 2019 6:03 pm

slalombuggy wrote: I used a Malpassi regulator from CB works perfect and less than 1/2 the cost of the automotive fpr.

brad
^^^^^ I use this! Never a problem.

Sun Sep 22, 2019 5:20 pm

Rebuilt it with the Holley kit. Found some odd crap, but nothing that should impact the pressure. Ball and spring work as they should, but it never goes below 2.5 psi. And that only when running, if I just energize the fuel pump it hits 3psi.

I don't think this is actually the cause of the rich idle problem I have, just eliminating suspects. And since I had no idea about the condition the FPR was in, figured I'd tackle it.

I think it's just crap. :(

Here's the odd thing I found. On one side of the output, there's what looks like a wall that has rotted away. I'm guessing flashing from the casting process. But it's pretty damn thick. Couldn't chip it out with a screwdriver.

Sun Sep 22, 2019 9:22 pm

Whats the fuel pressure without the reg?

Mon Sep 23, 2019 5:12 am

It'll go over 4psi straight off the pump.

OK, yeah. It's not doing nothing at all. Just not what I want it to do.

I did a video of the rebuild...