High Pressure (HP) Fuel Pump
| ITEM | DESCRIPTION |
|---|---|
| 1 | Fuel pump shield |
| 2 | Bolt - NVH cover (2 off) |
| 3 | Bolt (2 off) |
| 4 | Acoustic cover |
| 5 | High Pressure (HP) fuel pump |
| 6 | Exhaust camshaft lobe |
| 7 | Gasket |
| 8 | Cover assembly |
| 9 | Stud (4 off) |
The HP fuel pump is located at the rear of the engine and is driven off the exhaust camshaft. The pump is mounted on a cover assembly and secured with two bolts. The cover assembly is attached to the cylinder head, sealed with a gasket and secured with four studs. The extended end of the exhaust camshaft protrudes through a hole in the end of the cylinder head. A three lobe cam on the end of the camshaft locates inside the fuel pump cover and drives a plunger attached to the piston of the fuel pump.
Because the HP fuel pump is driven off the engine exhaust camshaft by a three lobe cam, the piston of the pump cycles at 1.5 times the engine rpm. (Engine camshaft turns at one-half engine rpm multiplied by three for the number of lobes on the exhaust camshaft).
A shield is fitted to the fuel pump to protect it from damage and an acoustic cover is fitted over the pump to dampen pump operating noise.