Ezgo EXPRESS L4 Technician's Repair And Service Manual page 114

FUEL SYSTEM
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
B
a negative pressure moves the diaphragm within the
fuel pump (1) (Ref. Fig. 8). This movement draws fuel
from the fuel tank into the fuel pump chamber. This
action also closes the outlet valve which prevents fuel
back flowing from the carburetor.
As the piston moves down in the cylinder, a positive
pressure is formed in the crankcase which causes the
diaphragm to move in the opposite direction (away from
the engine). This action forces the inlet valve to close
and the outlet valve to open and supply fuel to the car-
buretor float bowl.
Fuel Pump Replacement
Tool List
Socket, 3/8" ................................................................. 1
Ratchet........................................................................ 1
Pliers ........................................................................... 1
Straight Blade Screwdriver.......................................... 1
1
Fig. 8 Fuel Pump
Do not confuse the pulse and fuel lines. Attempting to
operate engine with lines reversed will result in fuel
entering the crankcase and diluting the oil and possible
engine damage.
The length of the pulse hose from the fuel pump is important
for efficient pump operation. If the hose is to be replaced, be
sure to replace with a hose of the same length and approved
material.
Observe and identify the supply and pulse hoses.
Remove the hoses, plug the fuel lines and remove the
fuel pump (1) by removing the two screws that secure it
to the bracket located on the seat support frame near
Page H-6
NOTICE
Repair and Service Manual
the fuel tank on the passenger side of the vehicle
(Ref. Fig. 8).
Installation is in the reverse order of disassembly. Be
sure to connect the pulse line to the correct location on
the pump (Ref. Fig. 8).
FUEL LINES AND FILTER
Tool List
Pliers ........................................................................... 1
Straight Blade Screwdriver .......................................... 1
Qty.
Fuel is supplied to the fuel pump and carburetor
through flexible fuel hoses. An in-line filter (1) is
installed in the hose between the fuel tank (2) and the
fuel pump (3) (Ref. Fig. 9).
3
Fig. 9 Fuel Lines and Filter
To prevent possibility of personal injury, tests
that involve fuel flow should be avoided if at all
possible. If a test to determine fuel/vapor pres-
ence or flow is required, the ignition system
must be disabled. Remove the input wire to
the magneto in order to prevent an ignition
spark that could ignite the fuel/vapor. Never
permit smoking or an open flame in an area
that contains fuel/vapor. Clean up all fuel spills
immediately.
Qty.
1
2