Fuel System - TOHATSU MFS25 Service Manual

Check operation of
fuel feed pump (FFP).
Operating noise
heard?
YES
Measure fuel pressure.
Out of
specified range?
YES
Check fuel regulator of
vapor separator.
Normal?
YES
Check fuel rail for leak
and damage.
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25/30 2006

Fuel System

NO
Check electrical conductivity
of wire harness and fuse.
Conductive?
Check output from ECU to
fuel feed pump (FFP).
Output signal
exists?
Replace
fuel feed pump (FFP)
NO
Check injector clogging
and resistance.
Normal?
Check ignition system and
compression pressure.
NO
Repair or replace
defective parts.
YES
NO
Check or replace ECU
or alternator (ECU charge)
coil.
YES
NO
Replace injector.
YES
NO
Replace fuel regulator.
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