youre gonna need alot more than 2 gallons. when i ran my truck out, it took 5-7 gallons and alot of cranking to get all that air out. I dont know about the 6.4s, but Id say its gonna be about the same.
Lack of power, rough running, diagnostic code P2291:
This may occur on new trucks, trucks that have had the fuel filter or fuel pump replaced, the high pressure fuel system repaired,
or have been run out of fuel due to air in the fuel system.
The truck should be driven for at least 5 miles with 10 wide open throttle accelerations from 0-45 MPH. If the conditions still exsist after performaing this procedure, the fuel system should be diagnosed. Broadcast Message 9608
Source(s):
Tech bulletin.
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