phildawg19

i have been having some vapor locking issues and for that i am installing a holley fuel pressure regulator sometime tomorrow and was wondering if you guys had any tips as to where to place the regulator and pics of where you have placed yours?

phildawg19

ttt

Mike Ward

A regulator will not help with vapour lock problems. Save your money.

You didn't say what year or engine your car is (this always helps when asking questions) but most C3s have a three port pump which will eliminate 99.9% of vapour lock issues. Many owners have inadvertently downgraded their cars by installing an aftermarket two port pump.

phildawg19

the regulator wont help keep the fuel cooler? my car is a 77. its a modified 350, patriot heads, comp cam, crosswind intake, holley 750 dp. and i did change the fp to an edelbrock 130gph which only has the 2 ports :/

Mike Ward

Vapour lock happens inside the fuel pump. The 'vapour', caused by engine heat, prevents the pump from drawing in more fuel, so the engine runs rough or dies.

The stock three port pump constantly recirculates the fuel by pushing some of it back to the tank via the bypass line. The incoming cooler fuel from the tank prevents vapour from forming.

phildawg19

so would it help to go from hardline to pump, to the regulator, to the carb? im having a return line branching from the regulator as well

MelWff

If you are using the Edlebrock 1711 pump it is a 10psi pump and you need a regulator. A good place to locate it is right before the carburetor.

Mick71

Used a Holley FPR on a cantankerous Ducati to solve overpressurized fuel system once. My regulator came with a 3.5 psi setting from the factory, FYI. Don't see how it would help for vapor lock tho.