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Re: GM 6.5l Diesel no start
Posted to HD/Fleet Forum on 5/15/2019 3 Replies

P0231 is a lift pump problem. Lift pump problems are very common. Remove the fuel line from the injector pump and tee in a mechanical fuel pressure gauge. Cycle the key ON and you should see around 5 psi fuel pressure. If no fuel pressure, you need to diagnose... Login to read more.

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