3A-6 - FUEL SYSTEMS 90-824052R3 JUNE 2002
a
b
c
a-Clear Hose
b-T-fitting
c-Vacuum Gauge (obtain locally)
Vacuum Test Troubleshooting
This test is normally performed at an idle speed. As
engine rpm increases, there will be a slight
increase in vacuum. The increase should not
exceed specification.
Normal Reading
Below 2.5 in. (64 mm) of
vacuum (mercury)
Reading above 2.5
in. (64 mm)
of vacuum
(mercury)
Restriction within the fuel
system –
• Restricted anti-siphon
valve
• Restriction within the
primer bulb
• Kinked or collapsed
fuel hose
• Plugged water sepa-
rating fuel filter
(in the boat)
• Restriction in fuel line
thru-hull fitting
• Restriction in fuel tank
switching valves
• Plugged fuel tank pick-
up screen
Fuel Pump Removal/Disassembly
IMPORTANT: Fuel pump diaphragm and gaskets
should not be re-used once fuel pump is
disassembled.
1. Disconnect fuel hoses from fuel pump.
2. Disconnect pulse hose.
3. Remove two mounting screws.
4. Remove fuel pump from engine.
51803
a
e
d
b
d
c
a - Fuel hose from tank to fuel pump
b - Fuel hose from fuel pump to carburetors
c - Pulse hose
d - Mounting screws
e - Fuel pump
5. Disassemble fuel pump.
50161-1
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