Troubleshooting - TOHATSU 40 Service Manual

SECTION 3

TROUBLESHOOTING

The troubleshooting chart lists common engine symptoms related
to problems with the fuel system. It also indicates specific
malfunctions in the fuel system which may be causing the problem
so it can be isolated more effectively. Before beginning major
troubleshooting operations on the fuel system, perform the
following operations:
• Disconnect fuel tank hose from the engine. Connect a known
good tank and hose and determine if the problem persists.
• Remove and clean the engine fuel filter assembly and replace the
filter element.
• Replace filter element in the fuel tank pickup tube.
• Remove and clean the automixing check valve.
Checks
Empty fuel tank
Low fuel in tank
Fuel tank air vent closed
Poor quality or old fuel
Water in fuel system
Fuel hose pinched or disconnected
Restricted fuel pickup pipe or clogged
pipe filter
Faulty primer bulb
Improper or faulty anti-siphon valve
Clogged fuel filter
Loose connector or vacuum leak
3-6
Symptom
FUEL TANK AND FILTERS
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3-/ 4-Cylinder