Service as Required NOTE: These are the 4-valve cylinder head 4.5 L and 6.8 L model engines with Denso HP3 pumps and High Pressure Common Rail (HPCR) fuel systems (decal on rocker arm cover marked or “24V”). IMPORTANT: Four valve cylinder head engines are especially sensitive to fuel contamination. Do not crack any fuel lines to bleed the fuel system. RG12220 –UN–24MAY02 1. Loosen the air bleed vent screw (A) two full turns by hand on fuel filter base. Final Fuel Filter Bleed Vent Screw A—Bleed Vent Screw OURGP11,000013E –19–21NOV03–2/3 2. Operate fuel supply pump primer lever (B), or primer button on fuel filter base (if equipped), until fuel flows out of bleed vent screw. 3.
Tighten bleed vent screw securely. Continue operating primer until pumping action is not felt. 4. Start engine and check for leaks. RG12221 –UN–24MAY02 If engine will not start, repeat steps 1-4. B—Primer Lever Fuel Supply Pump Primer Lever OURGP11,000013E –19–21NOV03–3/3 40-18 021604 PN=191