SERVICE TIP
Model : MX825V-EFI
26
Fuel Pump System
Operation
• The positive and negative pressure pulses created
in the crankcase during engine operation move a
diaphragm assembly inside the vacuum pump (1)
back and forth – detected through hose (2)
• This diaphragm action draws fuel from the external
fuel tank(s) through the replaceable filter (3)
• Fuel is then pumped from the vacuum pump into a
small reservoir inside the electric fuel pump
assembly (4)
• The electric pump then provides pressurized fuel to
the fuel injectors through the high-pressure hose
fitting (5) – fuel pressure specification is listed in the
2016 MX825 EFI Seminar material
Service Tips
• If excessive fuel accumulates in the crankcase
sump, the diaphragm assembly in the vacuum
pump (1) may have failed, allowing fuel to flow into
the crankcase via hose (2)
• Fuel filter (3) should be replaced following the
interval listed in the MX825 Owner’s Manual
Maintenance Schedule
• Electric fuel pump (4) is not serviceable, and the
internal fuel filter is not replaceable
• Vacuum and electric pump output specifications are
listed in the 2016 MX825 EFI Seminar material
(1)
(3)
(4)
(5)
(2)
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