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E7 fueling problems


Q500
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1998 e7 high hrs but good shape. Changed number one injector to fix miss. Found unit pump is weak, found number four unit pump even weaker and miss. Took it for a short drive after replacing injector half way through drive it started blowing gray smoke at all rpms and pressurizing fuel tank with air. Sounds horrible like its way out of time. I'm stumped.

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Another clue to the puzzle or possible more problems. Cold start it has a hard time getting fuel once it gets fuel it runs good for a couple seconds then starts smoking and banging. Kinda acts like it broke a nozzle and the unit pump just let's fuel flow through. I have no clue how its pressurizing the fuel tank?

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