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Al, you could have the same problem if it's not sitting level too....

That's why I now put a piece of plywood under them if they are on any sort of an incline.

I had dug a flat shelf into the side of a pond bank after I moved it down to be closer to the water. Vibration made the intake side walk into the flat shelf that I dug and it now was tipped to one side and not running. I couldn't figure out why it stopped - it had plenty of gas and oil.