166
FUEL SYSTEM
FUEL COMPONENT TESTS
open check valve at approximately 15 psi (103
kPa).
Circulation Pump Resistance Test
Disconnect the battery cables at the battery.
Use a digital multimeter to measure the fuel pump
circuit and coil resistance.
Lift Pump Pressure Test
Install a 0 to 15 psi (0 to 103 kPa) Fuel Pressure
Gauge, P/N 5006397 or equivalent, to the lower
fuel pressure test fitting.
Prime the fuel system and check for leaks. START
outboard and run at idle speed. Hold gauge level
with inlet fitting and monitor gauge for pressure
reading.
Pressure should stabilize and gauge must not
indicate less than 3 psi (27 kPa).
Results:
Normal pressure
•
Perform the
Lift Pump Vacuum Test
on
p. 167. Make certain no air leaks or restrictions
exist in the fuel supply hose or boat fuel system.
Low pressure
•
Check pulse hoses and fittings for restrictions.
•
Perform the
Lift Pump Vacuum Test
on
p. 167. Make sure no air leaks or restrictions
exist in the fuel supply hose or boat fuel system.
•
Check fuel flow through fuel lift pump. Use fuel
primer bulb to force fuel through pump.
No pressure
•
Check pulse hoses and fittings restrictions.
•
Check fuel flow through fuel lift pump. Use fuel
primer or primer bulb to force fuel through
pump.
•
Momentarily prime or squeeze primer bulb to
check gauge operation.
•
Check pulse hose and fittings for restrictions.
1.
Pressure regulator
2.
Fuel return fitting
000249
Fuel Pump Resistance
Between 2 and 3
Ω
@ 77°F (25°C)
Fluke
Model 29 Multimeter
002382
2
1
1.
Fuel pressure gauge
2.
Test fitting
005010
1
2
Summary of Contents for E-tec 75 HP
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Page 233: ...233 POWERHEAD POWERHEAD VIEWS 10 POWERHEAD VIEWS Port Short Block Starboard Short Block ...
Page 234: ...234 POWERHEAD POWERHEAD VIEWS Port Dressed Powerhead Starboard Dressed Powerhead ...
Page 235: ...235 POWERHEAD POWERHEAD VIEWS 10 Front ...
Page 236: ...236 POWERHEAD POWERHEAD VIEWS Rear ...
Page 237: ...237 POWERHEAD POWERHEAD VIEWS 10 Top ...
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