Originally Posted by kp30707
Has anyone got an answer
There are bare wires in the HPFP cover gasket that rub on the pump and eventually a hole wears through the sheath causing the bare wire to touch the block. I am pulling this info from Diesel Power Mag. the Dec 2012 Issue. I Recently bought a 2008 and after reading this artice i looked in my own truck and i could see the wear. i put a heat shrink protective cover over the wires to hopefully stop this from rubbing all the way threw. I will be keeping an eye on it.
In the article I says that when this wire grounds out it will cause a no start situation and you may se the following codes. (P0003, P0004, P0091) all fuel related. and could also see (P042F, P0488, P0670, P0691, and P179A.) This is because the same fues tha blows from the short in the hpfp circuit is used for EGR components, the glow plug contorl module, the electronic fan clutch, and the VGT actuator.
This is a known problem in the 6.4L. I am pulling this info directly from the article in Diesel Power Mag.