The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

SunSoaked · 10-18-2021, 07:09 PM

@VetteVet,

Thanks for the diagram. Here's my question/concern since I am keeping both tanks (Main & Aux). Since the power circuit runs THROUGH the factory selector switch it makes running new dedicated power feeds redundant and more complicated.

My options are to assume the selector switch (not the 6 way valve) is rated at the 6 amps the ep381 pumps draw and leave the wiring as is...or

Run an additional two relays after the switch and use the switches output to control a relay on each power lead to each pump.

Keep in mind I'll still need an initial relay to feed the power from the ignition because the Edelbrock EFI uses a NEGATIVE signal to turn the pumps on/off, so I got to reverse that to play well with the sending units which are grounded to the motor and chassis.

Geez, it's never just easy!

10-18-2021, 07:09 PM	#4
SunSoaked Registered User Join Date: Dec 2011 Location: Yuma Arizona Posts: 1,525	Re: Need some HATZIE help! EFI Pump Power? @VetteVet, Thanks for the diagram. Here's my question/concern since I am keeping both tanks (Main & Aux). Since the power circuit runs THROUGH the factory selector switch it makes running new dedicated power feeds redundant and more complicated. My options are to assume the selector switch (not the 6 way valve) is rated at the 6 amps the ep381 pumps draw and leave the wiring as is...or Run an additional two relays after the switch and use the switches output to control a relay on each power lead to each pump. Keep in mind I'll still need an initial relay to feed the power from the ignition because the Edelbrock EFI uses a NEGATIVE signal to turn the pumps on/off, so I got to reverse that to play well with the sending units which are grounded to the motor and chassis. Geez, it's never just easy!