Discussion Forum - Northstar Chevelle Club

69SSConv · Active Member

Electric Fuel Pump Mounting locations?

steve m · Member

Most electiric pumps need to be below level of tank to work properly, most pump just push and dont create must suck.. depends on your pump, holley pumps are noisy and need to mount with rubber isolators, I ran a A1000 pump on my drag car and mounted it to the frame back by bumper, you could see it, The tank was sumped. I wound stick with a mechanical one if it is less than 500HP,

69SSConv · Active Member

After doing some research, it looks like for a street car, it is best to stay with a mechanical. This car will only run about 300 hp I estimate (SBC 355).

bowtie · Secretary

I would stay with mechanical too at that level. I had a Holley Blue electric on one car and it was noticeable when idling, and a Carter up over the rear axle when I was carb'd in this car, also kinda noisy. My Walbro inline one I can only hear when it's running but the car hasn't started yet. Mine is on the rear crossbar and hidden by the bumper. The best for sound would be an in-tank one.

As for the oil pressure switch, definately a good idea if you go with electric.

Lost in the 60s · President

bowtie wrote:
I would stay with mechanical too at that level. The best for sound would be an in-tank one.

As for the oil pressure switch, definitely a good idea if you go with electric.
This brings up an useful subject for me. My engine has no provision for mechanical and has an electric pump mounted in front of the tank. I removed the electric sender for oil pressure and installed a mechanical gauge. It appears I should use a T at the block and wire the sender back in to trigger a relay for the pump instead of direct wiring as I was going to do.

bowtie · Secretary

I don't remember specifically, but I don't think mine has a relay. Basically, once pressure is built up, it feeds power to the fuel pump. If it's been sitting more than about a day, then it has to crank a little before getting fuel. I actually like it since it's also more like a pre-lube system too.

67ss · 1K+ Club

bowtie wrote:
I don't remember specifically, but I don't think mine has a relay. Basically, once pressure is built up, it feeds power to the fuel pump. If it's been sitting more than about a day, then it has to crank a little before getting fuel. I actually like it since it's also more like a pre-lube system too.

Yours has a relay and an oil pressure switch to control the fuel pump. On a carbed vehicle just an oil pressure switch is typically all you need to run the pump.

bowtie · Secretary

Doh! I remember that, they're on my firewall. I was remembering the carb's versions.

Lost in the 60s · President

I talked to my electrical engineer friend last night and he agrees, we will use an oil pressure signal to power a relay. There will be other relays anyway, for the headlights to run full power, and future electric fans, so I will make a panel to hold them and the buss bar up under the left fender out of sight, like my Camaro rs headlight control.