F 350 4WD Pickup V8-460 7.5L (1984)
rear tank pump.
The input power to selector relay terminal number 3 is provided by two sources: direct from the starter solenoid during the crank mode only, or through a
0.75 ohm resistance wire connected to terminal number 3 of the fuel pump cutoff relay. The resistance wire reduces slightly the voltage supplied to the in
tank pump during normal operation. The fuel pump cutoff relay coil receives its power through terminal number 2 from an engine activated oil pressure
switch which is closed only when the engine is running and the relay coil is grounded through terminal number 1. Power to run the fuel pumps is
supplied through an inertia switch to terminal number 4 of the fuel pump cutoff relay.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: "INFORMATION ONLY"
Fuel Selector Valve Does Not Change Tanks
