RAM 3500 Van V8-5.2L CNG VIN T (1996)
Fuel Pump Relay: Description and Operation
Helpful Information
CIRCUIT OPERATION
Circuit A14 from fuse 8 in the Power Distribution Center (PDC) supplies battery voltage to the contact side of the fuel pump relay. Circuit A21
from the ignition switch powers circuit F18 through fuse 19 in the fuse block. Circuit F18 supplies battery voltage to the coil side of the Automatic
Shut Down (ASD) and fuel pump relays. The Powertrain Control Module (PCM) provides the ground path for the coil side of the fuel pump relay
on circuit K31. Circuit K31 connects to cavity C19 of the PCM connector.
When the PCM grounds the fuel pump relay and the contacts CLOSE, circuits A14 and A141 are connected. Circuit A141 supplies voltage to the
fuel pump motor (part of the in-tank fuel pump module).
