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https://www.steelsoldiers.com/threads/all-the-tms-you-need-to-work-on-the-mep-003a.155936/ heres the link. Are you skilled on reading diagrams?

click the TM tab up top go to generator and electrical TMs about 4 pages in is all the TMs you need for the mep003 download the -12 tm (not the one ending in LO) and look at pdf page 53. thats the control diagram

I'm pretty sure it will. I believe the float deenergizes the valve

Also for reference I wouldn't run a wire directly from the battery to whatever you're testing because you're relying on absolutely no over current protection so if you have something badly shorted to ground you're going to find out very quickly and very burny. Just something to keep in mind

I've never seen a pump clog cause the circuit breaker trip. That is a classic sign of capacitor failure. Do this for me so I make sure that we're on the same page unplug the fuel pumps from the generator place the set in run and prime and two of those pumps should have 24 volts to chassis...

If they are actually bad, yes both. Why are you running a wire from the battery to the pump? Didn't you verify power to the pump quick disconnect? These are still available, but they can be quite costly. Not to mention the odds of all 3 failing together is slim.

Yes they are

This is on a 004 (my 003 isn't close by and I'm not motivated enough to put pants on to go to it). However same fuel pump. See the metal tube bolted to the chassis? That's the cap. Hope that helps

The switch should only click once per position you move it to, from what you described with 24 volt to the pump qd and no noise indicates a pump problem. A clogged pump may click very slowly. A gummed pump won't click at all. What you are hearing with the clicks is the plunger inside...

And 56% funnier Sent from my SM-S908U using Tapatalk

If you have 24volt at the quick disconnect wother the suppression capacitor is burnt out, the pump is jammed, or the pump is burnt out. The capacitor can be removed and bypassed (see Guys comment above). The pump needs further disassembly and cleaned Or pump needs replaced The...

Find the 2 main fuel pumps (one is to fill the tank). There is a quick disconnect, unplug it and see if you have 24 volts to chassis with the switch in run. If you have power pump needs help. No power we gotta dig deeper. Sent from my SM-S908U using Tapatalk

Know the feeling. Too many projects not enough time Sent from my SM-S908U using Tapatalk

Means your 120 loads aren't balanced. You're close enough to not worry about it. The neutral carries the unbalanced load back to the head. Sent from my SM-S908U using Tapatalk

Waves from Florida Can't be too careful these days. The problem is too many people don't know the risks. Sent from my SM-S908U using Tapatalk

Noted, is it a safe assumption you are using it for backup use? If so you need to be sure you have a proper interlock (device preventing generator power from making to utility and vice versa)

Single phase 120\240. L0 is neutral. L1 a phase l3 b phase. Do you know what you're doing? Because there's a lot of ways to hook generators up wrong with very devastating results. Sent from my SM-S908U using Tapatalk

Ok. So 1 of 2 things is happening, 1 it's reading in error and tripping or something is going wide open and sending the voltage high.

Let's try something that's going to sound a bit silly, take the voltage adjust knob and rotated it's full span back and forth several times then set it to the lowest setting