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  #1 (permalink)  
Old 08-30-2013, 07:51 PM
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Default Fuel Pressure / bypass system

I would like to run a bypass style system with my new Weber setup. I've had some heat issues in the past so letting the fuel return to the tank sounds like a good idea. But I can't find a regulator that will bypass and also go low enough to make the Weber's happy.

Is anyone else running a bypass system or does everyone just deadhead to the Holley Low Pressure regulator?

Paul
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Old 08-30-2013, 08:11 PM
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Paul,

I ran a Mallory 4309, quite easy to run a softer spring and get 1-6 psi instead of 3-12 psi.

http://www.summitracing.com/parts/maa-4309
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Old 08-31-2013, 01:26 PM
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Quote:
Originally Posted by PaulProe View Post
I would like to run a bypass style system with my new Weber setup. I've had some heat issues in the past so letting the fuel return to the tank sounds like a good idea. But I can't find a regulator that will bypass and also go low enough to make the Weber's happy.

Is anyone else running a bypass system or does everyone just deadhead to the Holley Low Pressure regulator?

Paul

you could run the regulator you use now and add this, (see link) and adjust to blow pressure at the level you need.

Adjustable Pressure Relief Valve for Belt Drive Fuel Pump - Speedway Motors, America's Oldest Speed Shop

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  #4 (permalink)  
Old 09-01-2013, 04:34 AM
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I could show you how to modify a holley head regulator and turn it into a bypass regulator.

It would be your time and owe you about $5.
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Old 09-01-2013, 05:50 AM
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Default Regulator

Holley makes a regulator that's 1-4 lb available at Summit Racing
Jon
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Old 09-01-2013, 06:03 AM
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Paul,

Not running Webers but using a Holley on this car. Had quite a few heat issues with the carb: First Coast Cobra Club • View topic - Zephyr update June 2011

Pretty sure the reg is an Aeromotive 13204 (been more than two weeks since I put it on). Any reputable return-style reg should work fine.

Then I found that some of the problem, maybe almost all, was the fuel pressure gauge: First Coast Cobra Club • View topic - Liquid filled gauges - lesson learned!

Any more problems and I put EFI on the dang thing...

Hope this helps,

Tom

Quote:
Originally Posted by PaulProe View Post
I would like to run a bypass style system with my new Weber setup. I've had some heat issues in the past so letting the fuel return to the tank sounds like a good idea. But I can't find a regulator that will bypass and also go low enough to make the Weber's happy.

Is anyone else running a bypass system or does everyone just deadhead to the Holley Low Pressure regulator?

Paul
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Old 09-02-2013, 07:50 PM
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Quote:
Originally Posted by Gaz64 View Post
I ran a Mallory 4309, quite easy to run a softer spring and get 1-6 psi instead of 3-12 psi.
Gaz64
Is the lighter spring easy to find or did you just luck onto one?

I'm also curious about your comment to modify the Holley regulator turning it into a bypass type

Paul
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Old 09-03-2013, 02:08 AM
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Paul,

I modified the early Holley regulator about 12 years ago.

Quite easy once you see the principle.

I can't remember what spring I used but it was lighter than stock.

Holley has made the same regulator for some time:

http://www.summitracing.com/parts/hly-12-803bp

Note that they don't make a 12-804BP, which would suit what you need.
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Last edited by Gaz64; 09-04-2013 at 02:02 PM..
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Old 09-03-2013, 11:20 AM
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I use the Fuelab 51506-1-L-L. I got it from Speedway. I has a range of 1 - 3 psi. I have an in-tank pump and run the supply to the fuel loop (at left below) and then to the regulator at the end of the loop. The left port on the regulator is plugged and the bottom port is the return port. I have no problem keeping a steady 2.5 psi at the loop.



You can't see the regulator, but it is mounted to the firewall.

Tim
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Old 09-04-2013, 12:47 PM
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I posted a reply yesterday but got a message that it required moderator approval. Not sure why. Maybe because I had a picture in it. Anyway, it never showed up, so I guess it was denied.

Anyway, I'll try again without the pics. I used a Fuelab 51506-1-L-L. I got it at Speedway. It regulates 1 to 3 psi and is perfect for Webers. I have an in-tank pump that feeds the fuel loop around the carbs and then goes to the regulator. The other side of the regulator is blanked off, and the return leg goes out of the bottom. It works beautifully. I have a constant flow of fuel at 2.5 psi around the loop, which keeps the carbs nice and cool.

Tim
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Old 10-06-2013, 08:45 PM
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Quote:
Originally Posted by Gaz64 View Post
I could show you how to modify a holley head regulator and turn it into a bypass regulator.

It would be your time and owe you about $5.
Gaz64
Still looking for ways to convert holley regulator to bypass still. Do you have more info or details

Paul
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Old 10-07-2013, 02:16 AM
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Quote:
Originally Posted by Gaz64 View Post
Paul,

I modified the early Holley regulator about 12 years ago.

Quite easy once you see the principle.

I can't remember what spring I used but it was lighter than stock.

Holley has made the same regulator for some time:

http://www.summitracing.com/parts/hly-12-803bp

Note that they don't make a 12-804BP, which would suit what you need.
Quote:
Originally Posted by PaulProe View Post
Gaz64
Still looking for ways to convert holley regulator to bypass still. Do you have more info or details

Paul
Paul,

Yon can buy one as above, and fit a lighter spring.

I'll send you a PM about how I modified the early ones.

Gary
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Old 10-08-2013, 03:49 AM
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Have an Aeromotive. Comes with two springs, one for carb, one for injected. Have used it on both, and it worked very well with the Webers.

Never had any heat in fuel problems after installing.
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