91 f150 4.9 engine will crank if primed thru breather and crank after unless it sits for hr or so then gotta be reprimed to crank....any ideas as to why?


Asked by Oct 22, 2013 at 07:15 AM about the 1991 Ford F-150 S SB

Question type: Maintenance & Repair

fuel pump works fine   pressure test is ok  just won't crank after sitting for hr or so   once primed it cranks fine til next time it sits

2 Answers


When you say "crank" you mean it will not start, but will turn over, right?

1 out of 1 people think this is helpful.

it will turn over it cranks and runs great after priming and keeps cranking unless it sits for period of time

1 out of 1 people think this is helpful.

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