ford massive problems

I mean to say that the inertia switch wasn't popped and works

I mean to say that the inertia switch wasn't popped and works

I think you had the subject wrong so I corrected it for you,

Is there a tank switch-over valve that must actuate to select the proper pump?

Mitsurugi, electrical items aren't very mysterious, really. If you have electricity to the pump and a ground, and it's not running, then either 1. the pump is bad or 2. you're mistaken. Both are very real possibilities. You may be mistaken about the power as well.

The point about the fuel selector switch is a good one.

There is another possibility. I have seen circuits that with just a test light or even a multi-meter show voltage, but when a load hits the circuit, it fails.

Whitelightning

possibilities.

Always use a test lamp, never a digital meter. All you need to make a good test lamp is a tail light bulb and a clip lead. Cut the clip lead in half, solder the bulb in, tape it up and your finished.

Never assume the ground is good, test it. Always check the fuel pump before you put it in. Just because it's new does not mean it's good.

Al

How do I test the ground?

You can do a voltage drop test across the ground, but its easier to just disconnect it, clean it and reconnect it

Whitelightning