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The Emphasis is on helping each other with diagnostic assistance, encouragement and the sharing of information
that will ultimately help us all become better at what we do in a positive and professional forum.
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6.4L High Pressure Fuel Pump Cover Gasket
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 Some 2008
F-Super Duty vehicles with 6.4L Power Stroke Diesel engines built before August 20, 2007 may experience a
check engine light on, a lack of power or no start condition. The affected vehicles have engines that were
assembled using a fuel pump cover gasket that has unprotected wiring that may chafe on the fuel pump causing
a grounded circuit. See photo on the right. The circuits involved are the power supply and the control
circuit for the volume control solenoid. A grounded circuit will cause driveability concerns and may set
DTC's P0003, P0004 and P0091. Technicians servicing the vehicle may also discover fuse #74 at the battery
junction box open which is the VPWR circuit for several engine components including the Volume Control Valve
(VCV), Pressure Control Valve (PCP), Glow Plug Control Module (GPCM), EGR Throttle Plate Valve, Electronic
Fan Clutch, Turbo Charger Actuator and the Mass Air Flow sensor (MAF).
On December 13, 2007 Ford issued TSB 07-26-2 which provides the part number for the new fuel pump gasket.
Below are the old gasket on the left and the new gasket on the right. The new gasket has added protective
tubing over the VCV wiring. Owners and technicians should understand that the repair procedure to replace
this gasket requires cab removal to complete.
 Caution! Remember to cut the silicone sealant at the rear cover to cylinder block
junction before removing the gasket. 
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This article is only to provide information. It is hoped that it helps technicians in identifying possible
causes and assist in the quick diagnosis of the identified concern. This is not intended to replace any
official instructions, authorization or documentation of any Ford Motor Company Engineers, service manual,
TSB, Service Message or recall.
 FDDTS
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