Weber fuel pressure regulator

jbird · 04-25-2010, 06:13 PM

Hi, I need some feedback on which fuel pressure regulator works best for Webers.I am using a Carter 4070 which I mounted in the stock pump location on a 71 T 2.2 liter.I bought the Carter because I have read where it can be used without a regulator and has good flow.I have previously used a Holley red pump on my '65 but it seemed like I was always messing with the regulator to keep the pressure right.Has anyone used the Carter without a regulator or if you used a regulator which one?What is the ideal pressure to run with Webers?Thanks for your help.

lindy 911 · lindy 911's Garage

I have a Holley set at 3.5# with the engine running and it works well.

Lindy

Christien · Christien's Garage

I used a Carter very briefly, with no regulator - it is indeed the right PSI (3.5). The car ran fine, but because of the shape and size of the Carter, mounting it was a nightmare, and it didn't work - I think a hose slipped off, or the pump came loose or something. I don't remember. What I do remember is that it was on there for about 1 day before I replaced it with a proper one, replumbed and rewired to the front suspension pan.

RoninLB · 04-26-2010, 08:55 AM

I'd up-grade if I had the routine Holly gas regulator to a dual diaphram made for exotic fuels

in years past I've used a bunch of those Holley's without problems but gas ain't what it used to be. The issue was brought up on a hot rod forum

KTL · 04-26-2010, 09:20 AM

I have two inverted Holley red pumps (inverted for ease of swappage and two for redundancy) running against a basic Holley regulator like the one Ron pictured. I have been told by the guys I bought the racecar from that it should be run at 6.5 psi and that's what my VDO mechanical pressure gauge in the dash tells me it's running.

There's lots of schools of thought on tuning carbs, so i'm all ears about others' opinions & experiences. The Webers are new to me, so i'm simply sharing what I know is equipped on my car and how it's set up. I'm not saying it's necessarily optimal. The Holley stuff was used because it's cheap and readily available just about anywhere in the event of a failure at the track.

Mine is a 9.8:1 3.0L single plug Electromotive HPV-1 crank fire and Weber 46 with the aforementioned Holley stuff pulling fuel from a ATL universal fuel cell.

lindy 911 · lindy 911's Garage

I ran a Hardie pump with no regulator and had problems with the float needles getting pushed off the seats. The Hardie is supposed to be set up to run the Webers without a regulator. I switched to a Holley Red with a Holley regulator set at 3.5# and it has not had a problem since. I did mount the pump initially in the left rear wheel well next to the tunnel. This created a problem of the pump not wanting to "pull" the fuel as they are made to "push".

I remounted the pump up front in the smugglers box and it seems to like that better. The only problem with the Holley pump is the noise but it's a lot better than the Hardie.

Lindy

jbird · 04-27-2010, 05:50 PM

Thanks for everyone's input!I have a Holley regulator coming Thursday morning.

RoninLB · 04-27-2010, 10:59 PM

Quote:

Originally Posted by jbird

I have a Holley regulator coming Thursday morning.

use a very good gas filter and don't be afraid to clean it out periodically as their orifice diameter isn't the greatest in the $25 unit

carry a rebuild kit

good luck

911pcars · 04-28-2010, 12:14 PM

Airotex 4psi pump. Mount in front. No regulator needed. Pressure after filters at carb inlet measures 3.5psi. KISS.

Sherwood

GaryR · GaryR's Garage

The adjustable regulator with guage from PMO is a little expensive but fantastic..

1976 TN Porsche · 04-28-2010, 05:24 PM

I would go PMOs Fuel Pressure Control Unit. Available at PMO.

Turbo Den · 06-20-2010, 07:30 AM

Quote:

Originally Posted by 911pcars

Airotex 4psi pump. Mount in front. No regulator needed. Pressure after filters at carb inlet measures 3.5psi. KISS.

Sherwood

I like to keep it simple like you said... When looking to buy at summit racing, it says the Airotex 110-E80165S' listed applications are like 2 litre cars.
Should i have concern on this?? my sc is 3.0 on webers.

thanks.

Trackrash · Trackrash's Garage

Here's KISS all the way.

I'm running a Facet in the engine compartment.

It's mounted on my '71 with a 2,5 and Webers. No regulator.
Yea, I know now, it's not supposed to suck, but it does fine mounted like this. I installed this in 1983 more than TWENTY-FIVE years ago and it has run flawlessly ever since. That includes regular autocrosses and DEs.