Fuel pump Voltage drop issues

  • 4Running315
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6 months 1 week ago #201349 by 4Running315
Fuel pump Voltage drop issues was created by 4Running315
For starters;
1995 4Runner V6 3VZE 4X4

I’m having troublesome reading on a voltage drop test o the fuel pump.
The positive side of the circuit is reading about .96-.98v cycling the key, and when running climbs and settles at about 1.08-1.09v. Which is obviously way too high. I’ve run test resistance through individual sections of the positive circuit with not much luck, resistance wise, wires check out. The only thing I’ve found out of spec is the Circuit Opening Relay, while checking the +B and Fc terminals it reads 134 Ohms, 2 Ohms high of the cutoff of 132.

Would that off relay spec be that much of an issue?

Secondly, the ground circuit is reading .46v CONSTANTLY. Without the key ON or the pump being cycled. I’ve no idea why. With the pump being cycled and the vehicle running it stays at about a constant .48v.

Is the ground circuit supposed to read voltage with the vehicle off? I’d assume not. I’m stumped.
Any help is definitely appreciated!

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