Groundsmaster 3500 Page 6 − 27 Electrical System
Fuel Pump (Gasoline Engine Only)
1. Fuel pump
2. Fuel hose
3. Cable tie
4. Hose clamp
5. Fuel rail
6. Pump electrical connector
7. Nut
8. Filter
9. Gasket
Figure 35
1
2
3
4
5
6
A (+)
B (−)
4
6
1
7
8
9
175 to 200 in−lb
(20 to 22 N−m)
The electric fuel pump used on the Groundsmaster
3500−G is a positive displacement in−tank pump that
provides pressurized fuel to the engine fuel rail in a re-
turn−less system (Fig. 35). The fuel pump assembly in-
cludes a regulator to maintain fuel pressure. Electrical
power for the fuel pump is controlled by the engine ECU
through the PWR relay.
Fuel Pump Test (Fig 35)
1. Park machine on a level surface, lower cutting
decks, stop engine, and engage parking brake. Unlatch
and raise hood.
CAUTION
The fuel supply hose will contain pressurized
fuel. Be careful when disconnecting fuel supply
hose. Wipe away any spilled fuel before starting
the engine.
2. Disconnect fuel supply hose from engine fuel rail.
3. Install a fuel pressure gauge capable of measuring
50 PSI (350 kPa) to the disconnected hose.
NOTE: If pressure gauge is connected in−line (using a
tee fitting), fuel rail and injectors can be checked for po-
tential leakage while measuring fuel pump pressure.
4. While monitoring pressure gauge, turn ignition
switch to ON so the fuel pump is energized. Fuel pres-
sure displayed on the gauge should rise. Turn ignition
switch to OFF and then back to ON to re-energize the
fuel pump and fully pressurize the fuel line. Fuel pump
pressure should be approximately 43 PSI (300 kPa).
CAUTION
Make sure test wire connections are secure be-
fore turning ignition switch to ON to prevent an
explosion or fire from sparks.
Electrical
System
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