Ford has a mew filter for the 6.4 trucks. It helps keep water from getting to your high pressure fuel pump. It has an extra O ring on the frame mounted filter. If water gets to your high pressure it will ruin it, take out all of the injectors and all of the fuel lines. This will not be covered by any warranty. It is up to a $9000 cab off repair. Be sure you get the new filter! This is a problem for these trucks and thats why Ford developed a new filter.
Lynwood
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