Fuel Pump Control Module (Q45)

When ignition is turned on, or engine is cranked or running, fuel pump relay is activated. Battery voltage is directed from the fuel pump relay to Fuel Pump Control Module (FPCM) and fuel pump. The FPCM adjusts the voltage supplied to fuel pump according to engine conditions. FPCM supplies 11-14 volts to fuel pump under the following conditions:

• During engine cranking.
• Within 16 seconds after engine starts at temperatures greater than 212°F (100°C).
• Engine is running under heavy load and high speed conditions.

Under conditions other than those listed, FPCM limits fuel pump voltage to about 7 volts.