Holley Die Cast Bypass Fuel Pressure Regulators

If you’re running an electric fuel pump, chances are you’re going to need a regulator to control the fuel pressure. Available in polished Chrome or Black e-coat, Holley’s Die Cast Return Style Fuel Pressure Regulators are available for both carbureted and EFI applications.

[otismatvejs]

Can I block of one of the outlets if I don't want to run a return line back to the tank or will this cause problems? Thanks!

[jaffasoft]

Will these be good for waste veg oil in diesel vehicles? Need about 4-8 psi for mine.

[thedobermangang]

i have a bypass12-887 i have a vacumm port outlet on it do that line have to be hook up

[kevinmailand]

Will this work for my 1984 ford ranger 2.0 4 cylinder carburetor

[robert]

i bought the 12-803, can i plug the second outlet or does it need to be in use?

[AKANEWK]

Which side is the inlet and which is the outlet? Which one is the return?

[reddbulll]

I have a 94 chevy with the tbi fuel pump would the efi regulator work with a carburetor? Can the efi regulator put that low of a pressure?

[jamesloganZZ]

I have a 454 in a 85 montecarlo toped with a 750 holly doubble pumper carb running 6an braided lines and a 300gph fule pump in stock tank with a fule injection style 58psi fule reg. Before the engine that will reg. Down to it's lowest setting at 58psi. From there I run a holly fule reg. That regulates to 4.5 to 12psi. My problem is with both regulators in place I still get 58psi with both regulators screw cranked all the way out. I am wondering if I have a bad holly regulator. What's your thoughts on this? The holly fule reg. Said on the instructions that if running a hi psi pump to run 2 regulators as I did. Mind you, I paid 80bucks for the holly one off ebay and they go for 280 to 30p or more retail for a pro fule regulator. What are your thoughts on this??

[lynndragoman]

If I think my pressure is too high can I back out the adjustment one full turn as a check?
I don't have a pressure gage

[xlightssx]

My 2004 Grandcherokee has a non return EFI fuel system with the regulator near the tank. Can I add this bypass to my fuel rail and still retain the stock regulator near my tank?

[Dannymclovin]

I have an efi pump meant for high pressure cause its stock but the engine uses a carburator how much can psi can these regulators handle

[superfuntime]

Would it be acceptable to use one of the ports as a return on an older non return style regulator that does not have a specific port for return back to the tank ?

I run two regulators. One for the carburetor. One for a nitrous plate.
It seems like the carburetor pressure stays constant but the pressure going to the fuel solenoid for the nitrous plate gets backed up until I hit the button. I added a return line back to the tank off one port. I used a large jet inside the hose so it wouldn't be flowing all the fuel back to the tank. I just wanted the pressure to be more constant.

[FinVelle]

Just received the SECOND regulator and it’s leaking bad. The first one was cracked in the casting. Terrible product. In fact the entire Sniper EFI kit is garbage. Nearly half the parts in the kit are not the right pn’s on the list and it took customer service over a month to answer an email. I should have never bought this.

[darkmachine]

I like my regulator, Jegs didn't regulate jack, but holley's forgot to thread the bracket mounting ports on bottom of regulator lol no big deal I'll tap it but yall are slipping still love your products though.