Mariner Mercury 105/140 JET, Service Manual

Page: 300 / 797

90-824052R3 JUNE 2002 FUEL SYSTEMS - 3D-27
Vapor Separator Fuel Delivery Test
Purpose: Verifying there is adequate fuel flow to the
electric fuel pump (through full RPM range)
will determine components in low pressure
fuel system are functioning correctly.
1. Remove vapor separator drain plug and place a
clean container under drain.
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Results: If fuel flow is present, fuel is being delivered
to electric fuel pump. Go to high pressure flow
chart.
If fuel flow is not present, proceed to step 2.
2. Place emergency stop switch in OFF position to
prevent engine from starting. If boat is not
equipped with a emergency stop switch, connect
a jumper lead from the BLACK/YELLOW
terminal on the switch box to engine ground.
3. Turn ignition key switch to “START” and operate
starter motor for 10 to 20 seconds.
4. Look for fuel flow from drain hole.
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Results: If low or no fuel flow is present, inspect
water separating fuel filter and perform Vapor
Separator Float Test.