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check valve

  1. Powertrain ? Engine, Transmission &...
    Have a F350 6.0 automatic that I did a swap and put a 01 24v cummins and manual transmission in. Got all bugs worked out but 1. The engine will not crank unless I take the check valve out and put back in. This can be from overnight or crank and drive somewhere, kill it and try to crank right...
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