High Pressure (Hp) Fuel Pump: Notes
| ITEM | DESCRIPTION |
|---|---|
| 1 | Acoustic cover |
| 2 | Bolt (2 off) |
| 3 | High pressure fuel pump |
| 4 | Exhaust camshaft lobe |
| 5 | Gasket |
| 6 | Fuel pump support housing |
| 7 | Bolt (3 off) |
| 8 | Bolt |
The high pressure fuel pump is located at the rear of the engine and is driven off the exhaust camshaft. The pump is mounted on a fuel pump support housing and secured with 2 bolts. The fuel pump support housing is attached to the cylinder head, sealed with a gasket and secured with 5 bolts.
The extended end of the exhaust camshaft protrudes through a hole in the end of the cylinder head. A 3 lobe cam on the end of the camshaft locates inside the fuel pump support housing and drives a plunger attached to the piston of the fuel pump.
Because the high pressure fuel pump is driven off the engine exhaust camshaft by a 3 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.