Evinrude E-tec 75 HP Service Manual page 166

FUEL SYSTEM
FUEL COMPONENT TESTS
open check valve at approximately 15 psi (103
kPa).
1
1. Pressure regulator
2. Fuel return fitting
Circulation Pump Resistance Test
Disconnect the battery cables at the battery.
Use a digital multimeter to measure the fuel pump
circuit and coil resistance.
Fuel Pump Resistance
Between 2 and 3 Ω @ 77°F (25°C)
Fluke Model 29 Multimeter
166
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.
2
1. Fuel pressure gauge
2. 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.
2
Pressure should stabilize and gauge must not
000249
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.
002382
•
Check pulse hose and fittings for restrictions.
1
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