The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Fuel Pump Tie-In To Electrical System Question

RichardJ · 06-10-2010, 04:55 PM

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.

06-10-2010, 04:55 PM	#3
RichardJ Registered User Join Date: Apr 2010 Location: So Cal Posts: 1,416	Re: Fuel Pump Tie-In To Electrical System Question 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.