Re: cummins QSB5.9-30 won't start cold
Got the new mechanical lift pump installed and now holds 4.9 psi at idle. At no load WOT it holds 3.1 psi for 30 seconds, then pressure gauge needle slowly, (takes about 3 seconds), moves back and forth between 2 and 2.8 psi for about 18 seconds, then back to ... Login to read more.
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