Filter
Top Products
Workman HD Series Page 8 − 23 Electrical System
Fuel Pump/Sender (Workman HDX)
The electric fuel pump/sender used on Workman HDX
vehicles (Kubota EFI gasoline engine) is a combination
positive displacement pump that provides pressurized
fuel to the engine fuel rail in a return−less system, and
a fuel level sending unit. The fuel pump assembly in-
cludes a regulator to maintain fuel pressure of approxi-
mately 40 PSI (276 kPa).
Electrical power for the fuel pump is available when the
fuel pump relay is energized by the engine ECU and
when one or more of the transaxle switches are closed
(e.g. transaxle is in 2nd gear, transaxle is in low range,
or 3
rd
−high lockout switch is in fast position).
NOTE: When the ignition switch is turned to RUN, the
engine ECU energizes the fuel pump relay for approxi-
mately three (3) seconds which allows the fuel system
to be pressurized.
Fuel Pump Testing
1. Park vehicle on a level surface, raise bed and engage
parking brake. Stop the engine and remove key from
ignition switch. Allow engine to cool.
2. Install bed support on bed lift cylinder to prevent bed
from lowering.
CAUTION
The fuel supply hose will contain pressurized
fuel. Be careful when disconnecting fuel supply
hose. Wipe up any spilled fuel before starting the
engine.
3. Disconnect fuel supply hose from engine fuel rail
(Fig. 33).
4. Install a fuel pressure gauge capable of measuring
50 PSI (350 kPa) to the disconnected hose.
NOTE: If pressure gauge is connected to a tee fitting,
fuel rail and injectors can be checked for potential leak-
age while measuring fuel pump pressure.
5. While monitoring pressure gauge, turn ignition
switch to ON so that fuel pump relay and pump are ener-
gized. Fuel pressure displayed on the gauge should rise.
After pump relay is de−energized (approximately 3 sec-
onds), turn ignition switch to OFF and then back to ON
to re−energize the fuel pump relay and fuel pump. Fuel
pump pressure should be approximately 40 PSI (276
kPa).
6. If fuel pump pressure is low, make sure that electrical
power is available to pump and then consider a clogged
fuel filter or faulty fuel pump (see Fuel Pump in the Ser-
vice and Repairs section of Chapter 3 − Kubota EFI Gas-
oline Engine Gasoline Engine).
7. After testing is completed, remove pressure gauge
from fuel supply hose. Connect fuel supply hose to en-
gine fuel rail and secure with hose clamp.
8. Remove bed support from bed lift cylinder and lower
bed.
Figure 32
1. Fuel pump/sender
2. Fuel hose (to engine)
3. Pump/sender harness
1
2
3
Figure 33
1. Fuel supply hose
2. Hose clamp
3. Fuel inlet fitting
4. Fuel return hose
2
4
1
2
3
Electrical
System