Filter Head

Part number: WJN000030

These are prone to cracking and becoming porous. Aftermarket replacements are avavilable, along with redesigned billet alternatives such as this (as used by the author.)

Schematic

Stock Filter Head Disassembled

Positions below are per earlier schematic

Pos #	Location	Function	Part Numbers
7	Vehicle Rear, LHS/Chassis side (Blue)	Low pressure feed from pump
9	Vehicle Rear, RHS/Outer side (Natural)	Air bleed, return to tank	WJN500110
12	Vehicle Front, LHS/Chassis side (Red)	Fuel return from fuel cooler Note duckbill one-way valve: Not fitted to 10P engines. Questions as to whether needed - seems to run fine without it. Some debate as to correct position - people on internet suggest position 7 - assumedly to prevent backflow into the tank. The position shown here seems to hold fuel in the cooler unless under pressure. [TODO: experiment]	VUB503950
6	Vehicle Front, RHS/Outer side (Black)	Low pressure feed to pump