Fuel Pump Tie-In To Electrical System Question

[mike67]

My First Post

Just bought myself a project truck and I've started out by sorting my way through the wiring fiasco inside this thing. Can anybody give me some guidance on where to tie-in my fuel pump to a 1967 wiring harness as it pertains to these diagrams?

http://67-72chevytrucks.com/vboard/s...d.php?t=185856

Thanks!

[VetteVet]

Hi Mike, welcome to the forums you will find a wealth of information here.There are several ways to wire the pump including using a bosch relay and a standalone switch. The website I posted is only one way to do it. You need to know the amperage draw of the pump to see if it needs a relay and wiring it through an oil pressure switch means you'd have to have oil pressure for the fuel pump to work. Check with the pump manufacturer for more info.
Here is a website that should answer your Question.
http://www.mr-gasket.com/pdf/110_140.pdf

[RichardJ]

I can't believe those morons would tell anyone to tie an electric fuel pump into the ignition coil circuit. Actually it says mrgasket at the bottom of the page so I can believe they would, but it says Mallory at the top of the page and I find it hard to believe they would sign off on that.

Someone looking at that is going to ask themself a question. Am I going to stand on my head under the dash or just connect right to the coil?

At a minimum you should find an unused, switched 12volt pin on the fuse box. A better solution would be to power the pump with a relay. The 12 V for the relay would come from the terminal next to the battery. The switched 12v from the fuse box would be used only to energize the relay. An even better addition to that would be to provide a ground for the relay through an oil pressure switch. If the engine dies, the fuel pump is turned off. You get into an accident, the fuel pump is turned off when hopefully the engine dies as well.