I think I know the answer already, but wanted to post in case I missed something related to Onan service secrets... I have had a problem with the gen shutting down after short runs - load or no load....
As bud implied in his post if you have a bad connection you may not be getting a consistent 12v to the pump. This happened to me on a trip. I bought a new one at Napa when I went to install it I found that the butt splice from the 12v supply line to the pump was loose. I put in a new splice and now have a spare pump.
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