01 ford f150 5.4

Asked by Steven150ford May 01, 2018 at 02:49 PM about the 2001 Ford F-150 Lariat Crew Cab SB

Question type: Maintenance & Repair

I rebuild my 5.4 top to bottom... I also changed fuel
pump . in line filter. Iac. The truck after a 30 min
use starts to hesitate and lack power wanting to
turn off. . what. Am. I over looking

1 Answer

74,390

Check the EVAP system for proper operation. As you drive gas is removed from the tank. If a vacuum begins to form the fuel pump may not be able to overcome the negative presure inside the tank.

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