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You NEVER, EVER run the set with doors open. That only makes things worse. Read The Book.

That's exactly what I meant. When pumps run fast, it ran out of fuel. You might also want to check the FL1 & FL2 float switch. If FL1 is not working, the gen set will run till there is no fuel, and the fault indicator will not shut the set down and turn on the idiot light. .

Fast running pump, means no fuel.

Was the pump running fast? Or slow?

This is a must. Its cheap insurance, if the set is running good, and helps clean up engines that are fouled up. It helps clean up the fuel system, from tank to jug.

How about this. Hook the gen set to the house. Turn OFF a bunch of stuff in the house. Leave the Air Con on. Then turn on the load. Let the air con tell you how much load you need to add. If the set takes the air con, then turn on another Circuit breaker. No big load. Just something to see if it...