How to wire up fuel pump directly to the battery?

[dillont]

O, are we friends again?
Repeating what has already been said you can jump the pins to keep the pump running.
The fuel filter as BB said could also be your problem.

When the DME provides ground at pin 85 it will read maybe 0.4volts, not 2-3 volts.

Attachment 641661

Could this jump solution be used as a trigger from an outside source (IE, a GM ECU) to turn the fuel pump on?

[geargrinder]

Not the jump solution as that bypasses the relay. The proper standalone solution is just to trigger the relay. Should be a direct wire up replacement, unless the GM ECU fuel pump activation is switched-power not ground-switched. If the GM ECU is not ground switched, then just ground the other side of the relay activation coil. No reason to delete / bypass the fuel pump relay.

This ain't really a question for this thread by the way, so better to undertake this convo in your swap thread.