These guys are saying check valve in the FP.
It's worth putting a gauge on it before getting too far into downtime and the task.
Could the system pressure be leaking out (or in) somewhere?
SilveradoSierra.com • Fuel Pump problem - extended cranking required : Vortec 5300 5.3L V8 - Page 2
"Before replacing the fuel pump check your fuel pressure and see where the pressure is at it should be somewhere around 40 - 50PSI if i am not mistaken. Also check to see if the pressure bleeds off fast. If you leave the pressure gauge connected for a while the pressure should not move very much a few psi over 30min to an hour is normal."
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Meanwhile other things are still happening.
Last edited by john70t; 08-19-2015 at 06:45 PM..
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