F 150 Heritage 4WD Pickup V8-5.4L SOHC VIN Z Bi-fuel (2004)
Fuel Pump Relay: Description and Operation
Bi-Fuel LPG Models
ALT FUSE/RELAY MODULE
The ALT fuse/relay module contains two replaceable fuses. Refer to the Vehicle/Diagrams for fuse location. Fuse 1 (3A) protects the battery feed
(BATT) to the compuvalve and Fuse 2 (10A) protects the BATT to the ALT fuel power relay, in turn protecting the VPWR circuits of the compuvalve.
The ALT fuse/relay module also contains two dual mini ISO relays: the ALT fuel power relay and the fuel pump cutoff relay. The ALT fuel power relay
provides power to the compuvalve when the key is in the ON position. The fuel pump cutoff relay interrupts the power to the gasoline fuel pump from
the base gasoline fuel pump relay when the ALT/GAS switch is placed in the ALT position.
