Return/bypass style fuel pressure regulators

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Return/bypass style fuel pressure regulators

Post  1982GT on April 23rd 2018, 2:24 pm

Right now I'm running a Product Engineering 4400 (460gph) fuel pump. It has an adjustable #8 bypass. I'm looking into buying a new fuel pressure regulator, and I'm not sure if a non return style regulator will be sufficient with this pump even though the pump already has a bypass. I've had people tell me that I'll be fine with a dead head style regulator with this pump, and I've had others telling me that I should still go with the bypass/return style regulator.
The engine is a 466 with around 11.5:1 compression, Mildly ported aluminum SCJ heads, fairly aggressive solid lifter cam .657/.661...260/271@.050,
Victor intake/1050 4500 carb.
It does see occasional street duty.

Thoughts/opinions? Looking for suggestions.

Thanks,
Bryan
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Re: Return/bypass style fuel pressure regulators

Post  pmrphil on April 24th 2018, 8:32 am

I see a lot less pressure-induced problems using a bypass style system. The deadhead type does seem to heat the fuel quite a bit more, as well as pressure fluctuations from said heat.

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Re: Return/bypass style fuel pressure regulators

Post  dfree383 on April 24th 2018, 8:36 am

That pump appears to be super overkill for the application
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Re: Return/bypass style fuel pressure regulators

Post  DaveMcLain on April 24th 2018, 9:54 am

I use a bypass style regulator from BLP on my dyno which has two Holley black pumps that have been on there for more than 10 years. The pumps run really quiet because they only have to pump what pressure is needed at the carburetors and that means they never run up against their internal bypass. I think this can't do anything but help their longevity. Inside of the regulator is a "pill" that allows a small amount of fuel to bypass at all times. This makes the air get out of the system quickly when changing fuels etc.

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Re: Return/bypass style fuel pressure regulators

Post  1982GT on April 24th 2018, 12:45 pm

dfree383 wrote:That pump appears to be super overkill for the application

Dave, this fuel system will also be feeding a nitrous system.
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Re: Return/bypass style fuel pressure regulators

Post  1982GT on April 24th 2018, 1:42 pm

Thanks for the input...the pump is most likely overkill...initially the engine was going to be bigger, but the pump was already purchased. I figured it would most likely need a bypass system...just wanted a few opinions. I know the system will more than I’ll ever need!
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Re: Return/bypass style fuel pressure regulators

Post  1982GT on April 24th 2018, 10:13 pm

pmrphil wrote:I see a lot less pressure-induced problems using a bypass style system. The deadhead type does seem to heat the fuel quite a bit more, as well as pressure fluctuations from said heat.

I did have pressure fluctuations last year. Pressure would fluctuate nearly 1 pound in either direction from base setting after I drove the car around for a period of time.
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Re: Return/bypass style fuel pressure regulators

Post  Gregaust on April 26th 2018, 4:25 am

I run that exact pump , i use a 4 port P.E 4 port reg . Pump is set at 20 psi on the bypass , 6 psi at the reg. Works sweet

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Re: Return/bypass style fuel pressure regulators

Post  1982GT on April 26th 2018, 9:12 am

Gregaust wrote:I run that exact pump , i use a 4 port P.E 4 port reg . Pump is set at 20 psi on the bypass , 6 psi at the reg. Works sweet

To clarify, you're just using the pump bypass and not a bypass regulator?
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Re: Return/bypass style fuel pressure regulators

Post  Gregaust on April 27th 2018, 4:46 am

1982GT wrote:
Gregaust wrote:I run that exact pump , i use a 4 port P.E 4 port reg . Pump is set at 20 psi on the bypass , 6 psi at the reg. Works sweet

To clarify, you're just using the pump bypass and not a bypass regulator?

Yes exactly right. I do fair bit street driving and club some track days

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Re: Return/bypass style fuel pressure regulators

Post  1982GT on April 27th 2018, 6:13 am

Gregaust wrote:
1982GT wrote:
Gregaust wrote:I run that exact pump , i use a 4 port P.E 4 port reg . Pump is set at 20 psi on the bypass , 6 psi at the reg. Works sweet

To clarify, you're just using the pump bypass and not a bypass regulator?

Yes exactly right. I do fair bit street driving and club some track days

Thank you.
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Re: Return/bypass style fuel pressure regulators

Post  jbozzelle on May 5th 2018, 10:24 am

If Product Engineering sells regulators then your best bet would be to get their recommendation on what to use and if it needs to be a return or deadhead style system.

I'm using a Magnafuel 350 setup. It's deadhead and returns from the pump.

I've never had issues in the past with Holleys, BGs, Aeromotives, Mallorys, etc. when using the pumps and regulators that are designed to work together...

Seen plenty of people chase their tail mix matching pumps and regulators from different manufacturers...

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Re: Return/bypass style fuel pressure regulators

Post  1982GT on May 6th 2018, 6:35 pm

jbozzelle wrote:If Product Engineering sells regulators then your best bet would be to get their recommendation on what to use and if it needs to be a return or deadhead style system.

I'm using a Magnafuel 350 setup.  It's deadhead and returns from the pump.

I've never had issues in the past with Holleys, BGs, Aeromotives, Mallorys, etc. when using the pumps and regulators that are designed to work together...

Seen plenty of people chase their tail mix matching pumps and regulators from different manufacturers...

Thanks for the input. I'm certain my pump and my old holley regulator aren't working well together. I've been looking at both Product Engineering and Magnafuel regulators, since both pumps are very similiar in construction and operation.
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