27H6663 / 13H3907 Nuffield, Leyland and Marshall pin banjo bolt spill rail to filter the very fine hole is to self bleed the fuel for twin fuel filter assembly yet still maintain lift pump pressure.

Note: Fitted to the return fuel pipe banjo on top of the fuel filter assembly. 

See number 8 in the diagram of the single fuel filter assembly.

See number 44 in the diagram of the twin fuel filter assembly.

Fitted to:

• Nuffield 342, 460, 10/42, 10/60, 345, 465
• 344, 384, 255, 270, 262, 272, 462, 472, 282, 482, 602, 604, 702, 704, 802, 804
• Leyland 285, 2100, 485, 4100
• Marshall 602, 604, 702, 704, 802, 804, 904XL