Three Line Fuel Pump - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jason7627 · 10-31-2002, 11:42 PM

I put a new holley fuel pump on my '72 which replaced the original three line pump. Any ideas what to do with the other two lines?

*Fast68Chevy* · 11-01-2002, 01:13 AM

three port one would be later emissions one like 71-up. third line should be small slip on port and thats meant for vapor return line to the fuel tank. if carb is 4 bbl then the other two should be 3/8"- one threaded female port and one male 3/8" slip port.

threaded goes to carb inlet, and slip on is where main line form tank sender unit attaches

good luck

10-31-2002, 11:42 PM	#1
jason7627 Registered User Join Date: Mar 2002 Location: Dallas,Texas Posts: 15	Three Line Fuel Pump I put a new holley fuel pump on my '72 which replaced the original three line pump. Any ideas what to do with the other two lines? __________________ 72 lwb 468/th400/3.73 2/4 drop primer

11-01-2002, 01:13 AM	#2
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	three port one would be later emissions one like 71-up. third line should be small slip on port and thats meant for vapor return line to the fuel tank. if carb is 4 bbl then the other two should be 3/8"- one threaded female port and one male 3/8" slip port. threaded goes to carb inlet, and slip on is where main line form tank sender unit attaches good luck



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