Service manual

Rev. A
Groundsmaster 3280−D/3320Page 6 − 26Electrical System
Fuel Pump (Groundsmaster 3320)
The fuel pump used on the Groundsmaster 3320 (gaso-
line engine) is attached to the support bracket inside the
right side frame near the fuel filter (Fig. 36).
IMPORTANT: When testing fuel pump, make sure
that pump is not operated without fuel.
DANGER
Because gasoline is highly flammable, use cau-
tion 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 ventila-
tion when testing. Always wipe up any spilled
fuel before starting the engine.
Fuel Pump Capacity Test
1. Park machine on a level surface, lower cutting deck
(or implement), stop engine and engage parking brake.
2. Disconnect fuel pump discharge hose from the car-
buretor inlet (Fig. 36).
3. Make sure fuel hoses attached to the fuel pump are
free of obstructions.
4. Place disconnected pump discharge hose into a
large, graduated cylinder sufficient enough to collect 1
quart (.95 liter).
IMPORTANT: When testing the fuel pump, DO NOT
turn ignition switch to START.
5. Collect fuel in the graduated cylinder by turning igni-
tion switch ON. Allow pump to run for 30 seconds, then
release ignition switch to OFF.
6. The amount of fuel collected in the graduated cylin-
der should be approximately 13.5 fl oz (400 ml) after 30
seconds.
7. Replace fuel pump if necessary. Install fuel hose to
carburetor inlet.
Figure 36
1. Fuel hose (from tank)
2. Fuel filter
3. Fuel hose
4. Fuel pump
5. Fuel hose (to engine)
5
2
4
3
1
Fuel Pump Specifications
Pump Capacity
27 fl oz/min
(800 ml/min)
Pressure 2.8 − 4.3 psi
(19.6 − 29.4 kPa)