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Old 03-09-2004, 11:39 AM
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Fuel pump install ?

OK my stock Mech fuel pump in my 71 vette has 3 lines coming from it, my new holley Mech fuel pump has only 2 lines....

Does my new fuel pump not have a return? If so, what is the advantage/disadvantage of the return?

Also the new pump is for my new 450HP crate 383ci, should I buy a new fuel pump rod or can I use the old one?


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Old 03-09-2004, 03:05 PM
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You can block off the smaller fuel line that goes back to the tank, but make sure the system is properly vented.

I've been told that the return lines helped keep vapor lock down on some engines. AMC used a fuel filter up next to the carb that had a 1/4" hose going back to the tank to keep the fuel cooler by recirculating it before it heated and vaporized in the line.

Do yourself a favor and ck the pressure of the new pump. You won't need much over 6 pounds of fuel pressure.

You can use the stock pump rod if the ends are in good shape. One thing though, they do tend to "float" at high rpms causing the pump to not do much and possibly run out of gas. I believe that Moroso makes a light weight pump rod that will not float at high rpms.

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