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Sounds like air on the suction side of the pump.
Could be the water separator drain or the pickup in the fuel tank.
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-Justin
1984 F250 6.9 C6 2WD Push Button Wellman GPs, No Soup bowl. Wix 33439 Water Separator, Carter P4594 fuel pump, Custom 3" Exhaust, NTZ Oil Bypass Filter, VDO Vision water temp gauge, ISSPRO EV Pyro 
http://photobucket.com/CDX825
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