Thread: Mechanical VS Electrical, Being Fuelish.

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Originally Posted by Good Wrench

Yeah, I was thinking of a kill switch anyway on account of hearing cars just like mine are starting to disappear without the owners consent. But I can cut the distributor if it came to that.

What I was wondering is how much drag that mechanical pump is on the engine and would it be beneficial if the engine didn't hafta work to pump that pump.

It's true that my car is a daily driver but it's also my only toy right now. I'd like to do what it takes to get as much out of it as I can.

And on a budget too.

Maybe someone smarter than I am can explain it differently, but it has always been my opinion that it takes roughly the same amount of power to pump "X" volume of fuel from one place to another, whether it is in mechanical power or electrical power. If electrical, the alternator has to work harder to feed the electric pump and the crank has to turn the alternator, so.........where's the advantage, work-wise.

I guess it could be argued that one system is more efficient over the other, but I'm not convinced that there is that much difference. Certainly not enough to support the cost of a electric pump and regulator.

Seems like I remember an article in one of the car mags a few years ago where they dyno tested an engine with both types of pumps.

There was no measurable difference in power as I recall.