Andy 91GTA

iTrader: (2)

I've tried doing a search on who makes the best adjustable fuel pressure regulator but there hasn't been a clearcut consensus on who's is the best. I know there are a few out there, BBK, Crane, TPIS, Accel, Holley, Hypertech, etc. Your opinions on them would be appreciated.

Thirdgen86TA

I have a holly fpr. I really like it because you can turn it by hand and you don't need a seperate wrench.

Ed Maher

IMHO, there is a consensus. The holley is hands down the easiest to adjust. No tools needed, just an easy to reach and turn ****.

Functionally, all AFPRs are going to work the same. The difference is ease of adjustment. It takes me less time to set my fuel pressure then it usually takes the other folks i'm at the track with to get a wrench on the adjusting bolt for the first swing....

MdFormula350

i guess the best time when installing an afpr is when you port the plenum and / or put new runners on.

i was looking at the holley, nice piece i think i will go with that also.

SillyWabbit

I'm very happy with my Holley unit. I wouldn't even want to try to get a wrench of any kind in that small of a space to have to adjust my fuel pressure. I love just being able to turn the thing by hand. The only downside to the piece is that you have to grind away part of the rear corner of the plenum to get it to fit right. I was able to put the plenum on just fine without grinding, but I wasn't able to turn the dial at all.

Ed Maher

Hmmm, i didn't have to grind anything on my plenum. I don't even need to take my MAP or distributor cover off to turn the ****.

What year is your car. Maybe the early plenum is a little thicker in the back than mine. Or how bad is the interference. Is it just at the high end of adjustement. Off the top of my head i think i can get down to under 37psi, i forget if i was limited by running into the plenum or ran out of thread though....

Andy 91GTA

iTrader: (2)

Ed. Was it just temporary that the fuel pressure on the Holley wouldn't hold or was it something else.

https://www.thirdgen.org/techbb2/sho...sure+Regulator

Has the packaging of the Holley's gotten better in the past couple years?

Has anyone had to grind down there plenums a bit with the 89-92 style plenum?

Ed Maher

My pressure still leaks down after i shut the engine down, but it doesn't actually cause any problems. It doesn't leak down so fast as to prevent a quick restart, and once the engine has been off long enough for it to go low, it will reprime on start up anyway.

Roostmeyer

iTrader: (3)

I was going to get the holley unit but its not really all that difficult to braze... and if you screw up you were about to replace it anyway... Just a thought for all us cheap skates out here in the real world. http://www.gmtips.com/3rd-degree/dox/tips/afpr/afpr.htm

Acceld Z

I suggest getting an AFPR that comes with a new diaphram. The Accel and Holley units include them but they also cost more. Just my 2 cents

CHRISMAN2000

iTrader: (1)

Vader's article says the AFPR is for an 86. It'll still work for my L98 right?

Brian'sIROC

Another vote for Holley here. I had the Crane Cams one before, and wasn't happy with the ease of adjustment. Now it just sits in the toolbox.

Andy 91GTA

iTrader: (2)

Well I guess I'm going to buy a Holley one. Thanks for the info.

SillyWabbit

I have a '91 L98 Firebird. Other people in the Aftermarket Product Board had warned me about having to grind the plenum to fit, so I wasn't too surprised. Now I don't know if it is because I had the adjustment wheel out too much when I installed the thing, but when I had the plenum installed, the back corner was pushing on the wheel so that I couldn't turn it. I tried installing the plenum with just a few screws hand tight first to see, and I thought I got lucky and it would fit fine without any grinding, but once I tightened everything down, it didn't allow me to adjust it. Other than that, I didn't have any problems. To check the fuel pressure I have to remove my MAP sensor in order for the FP gauge fitting to fit on the test valve, but that's no biggie.

Kingtal0n

I may be crazy but i cant find the P/N for the holley AFPR unit.

I will be using stock tpi for a while, then probably a stealthram or large tube runners later. will it still fit?

and where the heck is it? if i had the P/N that would help loads...

Dustin Mustangs

iTrader: (1)

My accel unit won't bring my accel gauge below 50 psi, even with the adjustment screw all the way out. The gauge read my stock pressure at 47 psi before I put the adjustable unit in, where I belive 43.5 is spec. Regardless of which is out of wack, I wouldn't suggest either. Go with holley.

Morley

Sounds like you have the spring under the diaphram in cocked or something, or maybe there were some shims under the stock regulator that you missed removing. I have an Accel regulator that I can back off to 0 psi without problem

bigals87z28

With the mods in my sig, would it be a good idea to put in a AFPR?

Wishmaster's87IROC

iTrader: (4)

HOLLEY!

Dustin Mustangs

iTrader: (1)

hmmm... When you were assembling yours, did the security screws used to hold the housing that came with the AFPR to the original mount compress the AFPR spring as you tightened them down?? I thought I really took my time on that install, the last thing I wanted was a fuel leak on a hot manifold. Maybe it's time to take that thing back apart and check things over a bit.

Morley

Well, if you were to back the screw out all the way and install the regulator (like I did), then no, the cap didn't compress the spring as the screws were tightened.
If you take it back apart look carefully for any shims that might have been under the bottom end of the stock FPR.