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Question by wbski: how do you know when a diesel injection pump is going bad?
acts like its running out of fuel,but its not ,its getting plenty,lots of air bubbles in the return line when it starts acting up.I’ve had so much trouble that I used clear plastic lines so I could see whats going on.could it be the injection pump?sometimes it runs fine for days and then bingo its back.

Best answer:

Answer by busnuttwo
you have air geting into fuel system from where ? you did not not list car or engine so hard to help more but air in return to tank means air is comming some where

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