RAM 2500 Truck 4WD L6-5.9L DSL Turbo VIN 6 (1999)
Fuel Boost Pump / Fuel Transfer Pump: Testing and Inspection
The following tests will include: pressures tests of fuel transfer pump (engine running and engine cranking), a pressure drop test of fuel filter, a test for
supply side restrictions, and a test for air in fuel supply side.
Refer to Fuel Transfer Pump Description/Operation for an operational description of transfer pump.
Fuel Transfer Pump Location
The fuel transfer (lift) pump is located on left side of engine and above starter motor.
An improperly operating fuel transfer pump, a plugged or dirty fuel filter, or a defective overflow valve can cause low engine power, excessive white
smoke and/or hard engine starting.
Before performing following tests, inspect fuel sup- ply and return lines for restrictions, kinks or Teaks.
Fuel leaking from pump casing indicates a leaking pump which must be replaced.
Pressure Test: Because the transfer pump is operating at two different pressure cycles (engine running and engine cranking), two different pressure tests
will be performed.
