BRP E 250 L HO AG B, Руководство по обслуживанию

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163
Fuel System
Fuel System Tests
7
Non-Running Outboard
If the outboard does not run, turn the key switch to
the ON position to prime the fuel system. Crank
outboard; check circulation pump operation;
check fuel system pressure.
Results:
Normal pressure
•
Observe pressure reading after outboard is shut
OFF. Pressure should not drop below 15 psi
(103 kPa).
Pressure continues to drop below 15 psi (103
kPa) after outboard is shut OFF:
•
Check for leaking fuel injector.
•
Check for leaking pressure regulator.
•
Check for external fuel system leak.
High pressure:
•
Check for restricted filter or fuel return fitting of
vapor separator, damaged pressure regulator in
vapor separator, or restricted fuel return rail.
Low pressure
•
Check fuel supply to fuel lift pump. Refer to Fuel
Lift Pump Vacuum Test on p. 163. Higher vac-
uum readings indicate restrictions in the fuel
supply. Repair or replace as needed.
•
Restricted inline fuel filter.
•
Restricted fuel filter/water separator assembly.
•
Lift pump not supplying adequate fuel to vapor
separator. Refer to
Mechanical Fuel Pump
Pressure Test on p. 161.
•
If the above tests are good and vapor separator
remains full of fuel, check for damaged circula-
tion pump. Replace vapor separator assembly.
No pressure
•
Check electrical circuit and ground connections
for circulation pump.
•
If voltage is present and pump does not run,
repair connection or replace vapor separator
assembly.
Relieve fuel system pressure before removing fuel
pressure gauge. Refer to
Relieving Fuel System
Pressure on p. 168.
Fuel Lift Pump Vacuum Test
Confirm fuel supply to the fuel lift pump.
Temporarily install a vacuum gauge, T-fitting, and
8 in. (20.3 cm) of clear vinyl hose between the fuel
supply hose and fuel lift pump (inlet). Secure con-
nections to prevent fuel or air leaks.
START outboard and run at FULL THROTTLE for
at least two minutes. Monitor clear vinyl hose for
the presence of air. Air bubbles indicate a faulty
hose, connection, or fuel tank pick-up. Repair, if
necessary, before proceeding.
There should be no air or vapor bubbles visible in
the clear hose. The maximum inlet fuel vacuum
should not exceed 4 in. Hg. (13.5 kPa) at the inlet
to the fuel lift pump under any operating condi-
tions (IDLE to WOT).
A higher vacuum indicates an excessive restric-
tion in the fuel supply. Repair as needed. Refer to
Fuel System Requirements on p. 153 for fuel
supply component requirements.
NOTICE
Do not use fuel primer bulb, manual fuel
primer, or electric fuel pump primer to restart
outboard. A positive pressure in the fuel sup-
ply could damage some vacuum gauges.
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