fuel pressure question

ss3011 · 10-04-2020, 07:36 PM

It might be a good idea to stick a big fuel filter on the outlet side of the pump . Reduce the fuel pumps external regulator pressure down to around 15 psi by cutting down the regulator spring a bit at a time .

bert powell · 10-05-2020, 03:23 PM

I had this same problem with 40 micron filter inline before pump. The new regulators are extremely sensitive, mine is a Magnafuel. They said need another filter before regulator, 10 micron I believe but can find info on their site. Problem solved. If you don't have any filter this very well could be your problem.

Dan Walcott · 10-05-2020, 04:30 PM

I would suggest buying the total system from one manufacture , pump-filters-regulator. lines and fittings. As for line size, follow their recommendations , supply and return. I don't think you want to try to dead head this system. I installed an Aeromotive system last year. from the fuel cell to the carbs(2). Yes it is pricey, but it works!!

Dissident · 10-05-2020, 06:53 PM

Something to consider when planning or applying a fuel system of mix and match components. Mismatched components and dirty fuel systems cause a great percentage of the problems folks have to work on. All fuel systems are dirty whether with lines cuttings or old line deterioration. Taking the time and caution for filtering the fuel put into the tank through something so simple as a coffee filter is a natural solution.....cheap and effective.

Fuel systems should be evaluated as a SYSTEM where all the components must work together and that basic thought will get you very close to a best performance package!

The "old tried and true" (sic) Holley regulators will not hold more than about 21-22psi line pressure and at even less than that they have significant pressure creep problems. They also have the greatest "droop" curve when tested. Those things were designed to operate with a 10-12psi system pressure back in the day.The only saving grace is that they are cheap....

A reminder: What you need is flow at pressure where the system pressure before the regulator is opposing the gravity of the vehicle's acceleration. That is if the fuel is in the rear of the vehicle and the carburetor is in the front. It is not the expense of the components that qualify them, but their actual functions that make the best selections.

Regards to All that like this kind of stuff,
HB2

Dissident

10-04-2020, 07:36 PM	#1
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 910 Likes: 70 Liked 239 Times in 114 Posts	Re: fuel pressure question It might be a good idea to stick a big fuel filter on the outlet side of the pump . Reduce the fuel pumps external regulator pressure down to around 15 psi by cutting down the regulator spring a bit at a time .

10-05-2020, 03:23 PM	#2
bert powell Member Join Date: Jul 2002 Posts: 243 Likes: 36 Liked 34 Times in 12 Posts	Re: fuel pressure question I had this same problem with 40 micron filter inline before pump. The new regulators are extremely sensitive, mine is a Magnafuel. They said need another filter before regulator, 10 micron I believe but can find info on their site. Problem solved. If you don't have any filter this very well could be your problem.

10-05-2020, 04:30 PM	#3
Dan Walcott Member Join Date: Oct 2009 Location: Gaylord,Mi Posts: 126 Likes: 302 Liked 92 Times in 26 Posts	Re: fuel pressure question I would suggest buying the total system from one manufacture , pump-filters-regulator. lines and fittings. As for line size, follow their recommendations , supply and return. I don't think you want to try to dead head this system. I installed an Aeromotive system last year. from the fuel cell to the carbs(2). Yes it is pricey, but it works!!

10-05-2020, 06:53 PM	#4
Dissident Member Join Date: Jan 2016 Location: Colorado hills Posts: 123 Likes: 11 Liked 73 Times in 36 Posts	Re: fuel pressure question Something to consider when planning or applying a fuel system of mix and match components. Mismatched components and dirty fuel systems cause a great percentage of the problems folks have to work on. All fuel systems are dirty whether with lines cuttings or old line deterioration. Taking the time and caution for filtering the fuel put into the tank through something so simple as a coffee filter is a natural solution.....cheap and effective. Fuel systems should be evaluated as a SYSTEM where all the components must work together and that basic thought will get you very close to a best performance package! The "old tried and true" (sic) Holley regulators will not hold more than about 21-22psi line pressure and at even less than that they have significant pressure creep problems. They also have the greatest "droop" curve when tested. Those things were designed to operate with a 10-12psi system pressure back in the day.The only saving grace is that they are cheap.... A reminder: What you need is flow at pressure where the system pressure before the regulator is opposing the gravity of the vehicle's acceleration. That is if the fuel is in the rear of the vehicle and the carburetor is in the front. It is not the expense of the components that qualify them, but their actual functions that make the best selections. Regards to All that like this kind of stuff, HB2 Dissident Last edited by Dissident; 10-05-2020 at 06:55 PM. Reason: saving some spaces