Standard Procedure - Low Pressure Fuel Pump Test; Fuel Pressure Specifications; Fuel Line Connector - Mercedes-Benz 2005 Sprinter Service Manual

VA
FUEL SYSTEM (Continued)
Fig. 2 FUEL LINE CONNECTOR
1 - RELEASE ARM
STANDARD PROCEDURE - LOW PRESSURE
FUEL PUMP TEST
NOTE: Assure fuel tank quantity and proper fuel
gauge operation. Capture any fuel spillage and
store in appropriately marked containers.
(1) Disconnect the negative battery cable.
(2) Connect fuel gauge # 5069–2 with adaptor
#9068 to the low pressure fuel pump output line
junction at the fuel pressure sensor and assure that
the line locking tabs are secured in the lock position
(pulled back after hose is fitted properly). (Fig. 3).
(3) Connect negative battery cable.
(4) Crank or start the engine and observe the fuel
gauge reading.
Fig. 3 FUEL PRESSURE TEST
1 - INTAKE RUNNER #1
2 - INTAKE RUNNER #2
3 - FUEL RETURN HOSE
4 - FUEL PRESSURE GAUGE ADAPTOR HOSE
5 - FUEL PRESSURE GAUGE ADAPTOR #9068
The low pressure pump draws fuel out of the fuel
tank through the fuel filter. If the pressure reading is
below specification, look for damaged or leaking fuel
lines, replace the fuel filter and repeat this test. If
the fuel pressure reading is below specification again,
replace the low pressure fuel pump.

FUEL PRESSURE SPECIFICATIONS

STARTER SPEED
IDLING SPEED RANGE
MAXIMUM FUEL
PRESSURE
FUEL SYSTEM 14 - 3
6-22 PSI (0.4-1.5 bar)
29-36 PSI (2.0-2.5 bar)
51 ± 7 PSI (3.5±0.5 bar)