Lift Pump Vacuum Test; Lift Pump Diaphragm Test - BRP Evinrude E-TEC Series Service Manual

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 with tie straps to prevent fuel or air leaks.
NOTICE
Do not use fuel primer bulb, manual
fuel primer, or electric fuel pump primer to
restart outboard. A positive pressure in the
fuel supply could damage some vacuum
gauges.
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. 120 for
fuel supply component requirements.

Lift Pump Diaphragm Test

Perform this test only if a damaged pump is sus-
pected. This test does not confirm the perfor-
mance of the internal fuel pump check valves.
Remove the fuel inlet and outlet hoses from the
fuel pump housing.
Attach gearcase pressure tester to the fuel outlet.
Apply 3 psi (20 kPa). Replace lift pump if pump
fails to hold pressure.
Attach gearcase vacuum tester to the fuel inlet.
Apply 3 in. Hg. (-10 kPa). Replace lift pump if
007419
pump fails to hold vacuum.
FUEL SYSTEM
FUEL SYSTEM TESTS
007420
007421
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