Between Omaha and Des Moines, 7 miles South of I80 | Don't overtighten a new fuel return check valve; they only torque to roughly 28 ft lbs = just good and snug.(This is a good place to start)
I assume you already have a "hand priming pump"; if not, install one.
If you have been using the "bleed plug" a lot; then there is always a chance that the inner o-ring has chunk missing and can also allow air into the system, too.
There are some other items, too; but let us know after you change fuel return check valve.
Edited by 4WD 8/18/2013 10:42
 (3406E _C15 fuel filter base photo in paint program.jpg)
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 3406E _C15 fuel filter base photo in paint program.jpg (33KB - 320 downloads)
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C15 loosing its prime
