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Workman MDX--D Electrical SystemPage 5 -- 19
Fuel Pump
The MDX--D fuel pump is secured in a cavity i n the top
of the fuel tank (Fig. 26). Electrical current is available
for the fuel pump when the ignition switch is in either the
ON or START position.
IMPORTANT: When testing fuel pump, make sure
that pump is not operated without fuel.
DANGER
Because diesel fuel is flammable, use caution
when handling it. Do not smoke while testing the
fuel pump. Do not test fuel pump while engine is
hot. Make sure that there is adequate ventilation
when testing. Always wipe upany spilledfuel be-
fore starting the engine.
Fuel Pump Capacity Test
1. Park vehicle on a level surface, stop engine, apply
parking brake and remove key from ignition switch.
Raise and support cargo box.
2. Disconnect wire harness electrical connector from
the engine run solenoid toprevent the engine from start-
ing (see Engine Run Solenoid in this section).
3. Disconnect fuel hose (fuel pump discharge) from the
fuel/water separator inlet fitting (Fig. 27).
4. Make sure fuel hoses attached to the fuel pump and
fuel tank suction tube screen are free of obstructions.
5. Place disconnected fuel h ose into alarge, graduated
cylinder sufficient enough to collect 1 quart (0.95 liter).
IMPORTANT: When testing the fuel pump, DO NOT
turn ignition switch to START.
6. Collect fuel in the graduated cylinder by t urning igni-
tion switch to the ON position. Allow pump to run for fif-
teen (15) seconds, then turn ignition switch to OFF.
7. F uel collected in the graduated cylinder should be
approximately 16 fl oz (475 ml) after fifteen (15) sec-
onds.
8. Replace fuel pump if testing determines that it is
faulty. Remove seat base to access fuel pump (seeSeat
Base in the Service and Repairs section of Chapter 6 --
Chassis).
9. Install fuel hose to the fuel/water separator. Make
sure t o secure fuel hose with hose clamp.
10.Connect wire harness electrical connector to the en-
gine run solenoid.
11.Bleed the fuel system.
12.Lower and secure cargo box.
1. Fuel tank
2. Fuel pump
3. Fuel hose to filter
Figure 26
1
2
3
1. Fuel/water separator 2. Pump discharge hose
Figure 27
1
2
Fuel Pump Specifications
Pump Capacity
64 fl oz/min (1.9 l/min)
Pressure 7PSI(48.3kPa)
Current Draw 2.0 amp
Electrical
System