Starting The Engine - Mercury Racing 500R Operation And Maintenance Manual

PRIMING THE FSM (RAN OUT OF FUEL CONDITION)
The use of a purge tool for priming the FSM is the preferred method, but is
not always practical. When the vessel fuel system is void of fuel volume, it can
be primed without the use of a purge tool. The objective is to purge the air
entrained in the fuel system through the fuel injectors during engine cranking to
allow fuel to enter the fuel module. This method can be used on vessels where
the fuel inlet system to the outboard is less restrictive and holds a relatively
small volume of fuel; a short fuel supply line, no water‑separating fuel filter, or
water‑separating fuel filter is already primed.
NOTE: In most cases, the priming procedure can be accomplished by purging
the air from one fuel rail.
1. Verify the engine is in a level vertical position.
2. Verify the vessel fuel supply line is connected to the outboard fuel system
inlet fitting.
3. Turn the ignition key ON. The fuel pumps will run for approximately five
seconds.
4. Turn the ignition key to the START position and release the key. The
ECM controls the activation of the starter. The starter may continue
cranking for up to eight seconds.
NOTE: When priming a drained fuel system, residual fuel may cause the
engine to flare and stall which shortens the engine cranking event.
5. Continue with the ignition key ON and START sequence until the engine
continues to run.
IMPORTANT: Allow the starter motor to cool for 20 to 30 seconds between full
eight second crank events. Limit the number of attempts to a maximum of 10
full eight second cranking events.
6. Once the engine starts, it may run rough at idle for up to two minutes
while the residual air is purged from the fuel system.
7. If the fuel system will not prime within 10 full eight second cranking
events, use the previous procedure Priming the FSM with a Purge Tool
to prime the fuel system.

Starting the Engine

Before starting, read the Prestarting Check List, special operating
instructions, Engine Break‑in Procedure, Gear Shifting in this section, and
the remote control features and operation in the Features and Controls
section.
Without sufficient cooling water, the engine, the water pump, and other
components will overheat and suffer damage. Provide a sufficient supply of
water to the water inlets during operation.
OPERATION
NOTICE
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