Got a ‘65 A100 w/a slant 6. Thinking of installing an electric fuel pump. Open for positive - negatives thoughts on this. Thanks

They can be noisy, may require a regulator and some bracketry to mount it. None of those would be deal breakers I don't think. Others may have additional thoughts also....

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There's no such thing as too much cam....only not enough engine!

If you don't have an oil pressure switch in the pump circuit the pump can run when the engine is stopped. There are several bad outcomes possible from this.

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Joshua

stock engine or "built up"?

I think it depends upon what the electric pump is intended to accomplish...

My only experience here is as follows:
Electric fuel pumps do not like to "Pull" but do well when pushing. Plan to locate the fuel pump at or below the fuel tank, so it gets a steady, easy supply of fuel. Give it a good supply of electricity as voltage drop is hard on the pump. IF it quits, you are walking or repairing it.. (that is to say make sure your installation is well thought out, so that you get a reliable design that accomplishes what you are seeking to do)

As much as I like the idea of an electric fuel pump, (for vapor lock issues) I have come to the conclusion that if a mechanical pump can do the job, that is my first choice. It is easier, simpler, cheaper and better. If the mechanical system can not be improved for what ever reason then electric is a great answer..

Negative is fine to go to a frame rail ground; I'd run the positive to some kind of switch that's triggered when you either have cranking or oil pressure.

OK, serious answer: Is there a specific issue you're looking to solve with the electric pump? More pressure for EFI or boost, less vapor lock, more volume for a modified motor? A stock mechanical pump has the advantages of being cheap and simple.

I would recommend using a return-type regulator with an electric pump, not a dead-headed regulator, particularly if the goal is to deal with vapor lock.

You can stick a modern in-tank pump on the end of the fuel sending unit's pick up tube in place of the sock - that is a good way to avoid any issues with making the pump pull fuel. But this approach can end up with fuel starvation when cornering with a low tank (more of an issue on EFI motors, which don't have a float bowl under the hood). You can get creative with a fuel tank sump made out of something like a cake pan welded onto the tank.

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Matt Cramer
1966 Dodge Dart turbo / EFI project

X2 on the noisy. Don't bother with a nice stereo.

My Holley Red pump is just slightly quieter than a weed-whacker at 3/4 throttle.

CJ

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Part of Tyrde-Browne Racing

Most are very loud for sure! My sons truck had one mounted on frame rail under the bed. It was terribly loud for no real advantage over a stock mechanical pump. Bypassed it and installed standard pump. Standard pump has no trouble feeding any of the 4 barrel engines I have built.

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

I have run a stock fuel pump on a carter 750 in a car than ran High 11's.

No problem with pressure or volume.

Greg

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