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Old 10-26-2011, 03:34 PM
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Holley red pump plus mechanical pump

When I bought my car, it came with a Holley red fuel pump mounted next to the fuel tank. It pumps gas to a mechanical fuel pump on a 351w with a 750 Holley DP.

I was somewhat surprised to see that the fuel system has two pumps in line but have seen other postings where this is done.

I'm not sure that I even need two pumps to fuel the engine when I don't plan on racing the car. Prior owner claims the engine dyno'd at 425hp or 445hp (two different conversations with differing claims).

I haven't tried it, but wonder if the mechanical pump would still suck fuel from the tank if the Holley pump wasn't turned on. Don't know if the Holley pump will allow fuel to flow through with it not running. The Holley pump is very loud and having a switch to turn it off would be great if the fuel system will still work.

Other option is to just remove the Holley pump although it does look nice.

I'm also thinking of replacing the 750 with a 670 Holley SA. Thinking that I might get better mileage with a carb with vacuum secondaries than the mechanical ones I have now.

Any suggestions or comments?

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Old 10-26-2011, 04:24 PM
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Pretty safe bet that your mechanical pump would not be able to pull fuel through a disabled Holley electric pump.

You could try bypassing it and see how it runs but it will be a bung in the line without power to it.
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