ThomaZ Posted September 23, 2004 Share Posted September 23, 2004 I have a Holly Fuel Pressure Regulator (Summit P/N HLY-12-803), it’s unused but the instruction papers are gone. There is one port underneath marked “IN†and two on each side marked “OUTâ€. I am planning connecting one “OUT†port to the engine and the other to the fuel return line that leads back to the fuel tank. The pump is a Carter 7 psi street/strip (Summit P/N CRT-4594) and the engine a CSB 350 with a Holly 780 carburettor. However I can’t figure out which port on the regulator that is regulated and should be connected to the engine. I have searched Holley’s homepage and this forum but with out any luck. When searching my file over engine installation pictures I found one where the owner hade plugged one of the “OUT†ports on the regulator. On the fuel hose between the other “OUT†port on the regulator and the carburettor he had a fuel filter with a fitting for the fuel return line on it. Have I misunderstood this? Should one “OUT†port always be plugged? Quote Link to comment Share on other sites More sharing options...
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