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Author Topic: Carburated fuel pressure regulator-a question or two  (Read 1238 times)

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Offline russosborne

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Carburated fuel pressure regulator-a question or two
« on: September 22, 2014, 05:14:26 AM »
I'm doing some window shopping right now. Looking to add to my wish lists.  ;D

Will be a 302 based engine, I don't know yet if it will be stroked or not, or actual power levels. I am however trying to plan as if I will be needing stuff for high power levels, if that doesn't happen then no biggie, I would rather have too much than not enough and have to buy stuff twice. Plus there is always the chance that I will upgrade the engine at a later point.

I've come across both return and non return regulators. My question is if both have outlets what is the difference? the one I came across so far that I would go with if I had to today states it is a non return, yet has 1 inlet and 2 outlets.
It has 1/2 inch npt and is alcohol compatible, and our gas here has alcohol in it, so I want to be safe. I plan on running 1/2 inch fuel lines.
The others are 3/8 inch npt and are not alcohol compatible. But state they are return style.

The non return style ones do not state they are dead head types. So I am a tad confused. Marketing terms or ??? I've been told in the past that return types are better on the pump in the long run. I will be running a Mallory 140 pump that I already have from the old Lemans project. At least that is the plan for now.

So far I am only looking at Holley and Summit Racing brands. Just because I am familiar with them to a point, and know nothing about Aeromotive or the others. I am open to suggestions.

Thanks,
Russ
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In Glendale, Arizona

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Offline amc49

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Re: Carburated fuel pressure regulator-a question or two
« Reply #1 on: September 22, 2014, 07:58:15 AM »
Alcohol compatible means 100% and not ethanol, rather methanol. The normal added amount of ethanol unless E85 will not affect a gas only pump except very long term. You need 5-7 psi pressure for normal carb. Non-return and 'dead head' are the same thing, why no mention of other term when one is mentioned. Dead head means the pump is not moving fuel inside it once pressure is hit, the bypass return ones will but really no difference since the pump is loaded either way the same amount. Fuel cooling effect drops with no flow but the pumps easily take it as long as designed to. The best advantage of bypass return type is that vapor lock further back in lines is bled off by the bypassing. 2 outlets on a 1/2" non-return means one for each bowl like Holley. 1/2" would be overkill on a 302 unless like twin turbos, nitrous, or very hard accel like drag race with slicks.
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