Troubleshooting - TOHATSU NB-1000 Service Manual

SECTION 3

TROUBLESHOOTING

The troubleshooting chart lists common engine symptoms related to
problems with the fuel system. lt 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
tankand 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.
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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1-/ 2-Cylinder