Fuel Pump Troubleshooting; Carburetor Troubleshooting; Hard Starting; Stalling - Kohler 5E Service Manual

4.4 Fuel Pump Troubleshooting

The fuel pump transfers fuel from a source to the
carburetor.
Fuel Pump Test Procedure
1. Connect the inlet side of the pump to a fuel source.
2. Disconnect the outlet hose from the fuel filter and
place the end in a container to catch the fuel.
3. Disconnect the P9 connector.
4. Connect the positive (70) terminal of the fuel pump
to the positive (+) terminal of a 12-volt battery.
5. Connect the negative (N) terminal of the fuel pump
to the negative (--) terminal of the battery. The
pump should operate and fuel should discharge
from the pump outlet. If the pump does not operate,
replace the pump.
Figure 4-2 Fuel System Exploded View
10 Section 4 Fuel System

4.5 Carburetor Troubleshooting

This section is for fuel-related problems only. Use for
basic carburetor troubleshooting.
Note: When troubleshooting the fuel system, it is
important to have an adequate fuel supply.
A lean or rich fuel condition can reduce power output
and cause poor acceleration.
Symptoms of a Lean Condition:
D

Hard starting

D

Stalling

D
Rough idle
D
Surging above idle
Symptoms of a Rich Condition:
D
Hard starting
D
Stalling
D
Rough idle
D
Percolation
D
Flooding
D
Leaking carburetor
4.5.1 Hard Starting
A flooded engine, improperly adjusted or inoperative
choke, dirty carburetor (lean condition), or improper idle
fuel mixture can cause hard starting.
4.5.2 Stalling
Improper idle air/fuel mixture or a dirty carburetor can
cause stalling. Clogged idle air bleeds, idle air
passages, or an idle discharge port can cause stalling
because of a lean condition.
carburetor.
598642
Clean or adjust the
TP-5986 4/03