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Hello. My name is Tan.
Have you tried running the engine off a different fuel tank. Gas can Jerry can?
If you have an old fuel tank it could have debris in the tank blocking the flow of fuel to the engine.
When you had the fuel pump off did you inspect the cam the fuel pump rides on? Is it flat and worn down?
Ok Frank I don't know enough about this engine to go into any kind of details so I will opt out. Just thought I would see if I could help.