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Fuel valve fully open ?

If you are running saddle tanks, there could be trash partially blocking the pickup/valve at the bottom of the tank. The same goes for the valve to switch tanks if you have one.

Hi ho Hi ho............
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Is the tank venting properly? If it is fuel, like Breezmeister said could be blockage at the bottom of tank....

 

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Does it die with PTO on or off

 

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Did you clean it first?

 

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Buy a replacement engine, using a used broken engine to replace a broken engine equals another pain in the rear.....