H1 V8-6.5L DSL Turbo (1999)
Fuel Boost Pump / Fuel Transfer Pump: Diagrams
Figure 3-3: Fuel Lift Pump Electrical Circuit
The electrical circuit for the lift pump involves several main components (Figure 3-3). A relay mounted in the exterior fuse box, and the lift pump itself,
mounted near the filter on the left side of the engine compartment.
When the driver moves the ignition switch to the "RUN" position, the lift pump relay is energized by the PCM for 5 to 20 sec., depending on PCM time
out.
As soon as the PCM receives RPM signals from the EFI pump the relay is energized again. The lift pump remains running as long as the engine runs.
