RAM 2500 Truck 2WD L6-359 5.9L DSL Turbo VIN D FI (1997)
Fuel Injection Pump: Description and Operation
DESCRIPTION
Fuel Injection Pump
The fuel injection pump is a Bosch P7100 series in-line type. The injection pump is driven by the engine camshaft. A gear on the end of the pump
shaft meshes with the camshaft gear. The pump is timed to the engine. Fuel injection occurs near the end of the compression stroke for each
cylinder.
Injection Pump Governor And AFC
The RQV-K governor has a pump timing feature. This will allow the pump shaft to be oriented in a position corresponding to top dead center
(TDC) for the compression stroke of cylinder number one. Indexing the governor flyweight assembly to the shaft during assembly establishes
pump timing.
OPERATION
As engine speed increases, the internal pump pressure increases. An air-flow control (AFC) on the governor ensures that regulated fuel delivery is
matched to intake manifold pressure (turbocharger boost) for emission control.
The mechanical fuel transfer pump delivers fuel under a low-pressure of approximately 172 kPa (25 PSI) to the injection pump through the fuel
filter/water separator. The injection pump then supplies high-pressure fuel of approximately 120,000 kPa (17,400 PSI) to each injector in precise
metered amounts at the correct time.
