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Is this an LP or gas setup?
How long has it been since you ran this set? IF it has been some time, did you have a fuel stablilizer in the fuel?
The fuel should still be good then...........this is more than likely a problem with the control board. Does it stay running as long as you keep the start button down?
I didn't ask you for that............or was this a phone chat offer?
Then you may need to have it tested to be sure, but that is the most likely the cause. It is doubtful the fuel pump would be bad that quickly, unless it was an aftermarket pump. Some of those aren't too high on quality. Did you replace the fuel filter when you put the new pump in? Oil level up to full?
That is a sign that the control board is bad........usually. But sometimes it can be just a bad connection. You might disconnect the battery and then take the board loose at the plugs and plug them back in and clean the positive feed to the start solenoid and the ground strap at both the genset and the chassis. If you still have an issue, then replace the board. I like those after market boards made by Flight Systems. Check out their website. Hope that proves helpful here. Please get back to me later if you still need more on this as all follow ups are included in our fee.
I don't think the pump is the problem......did you read my last response?
Power to the fuel pump is from the same battery as is used to strart it.
Just checking back with you............did a new control board fix the problem?