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All of the arms move. They are just tight. I have worked them they don’t seem to want to loosen up. I was thinking about taking each one apart one at a time. Havent taken one apart before. Don’t want to damage the pump.

On a MEP-803a I have, the injections pump fueling control arms that have the pins that sit in the fuel rack are very tight. So tight that the rack spring cant move them all the way to run position. Most small injection pumps I have seen they are loose to the point where you can shake the ip and...