Installation manual

90-898305

4-6

Fuel Starvation

See Service Bulletin 2001-17

Models Affected

MERCURY/MARINER

1987 and Later, 30 Thru 250 HP, (with square fuel pump)

FORCE

1994-1/2 and later 40 Thru 120 HP, 1997 and later 175 Sport Jet

It is important that fuel supply restrictions/vacuum levels do not exceed

specification. High restrictions may result in the engine stalling at low speed,

and /or a lean fuel condition at high RPM, that could cause non-warrantable

engine damage. It is recommended to check fuel system vacuum on all new

boats/engines being prepared for delivery to ensure customer satisfaction and

engine durability.

Inspection/Test

The purpose of the following tests is to check the vacuum level required to

draw fuel from the fuel tank to the pulse driven fuel pump, check for air leaks

in the fuel supply system, and the condition of the pulse driven pump. The

following items will be required to perform these tests.

• Short piece of clear hose ¼” .250 [6.35mm] I.D.

• Vacuum gauge, (digital gauge is preferred) obtain locally

• “TEE” fitting that will fit ¼” .250 [6.35mm] I.D. fuel hose

• Tubing clamp P/N 91-804063

Make vacuum gauge, “TEE” fitting, and hose connection as shown.

NOTE: Prior to performing the following tests, squeeze the primer bulb to

determine if thereis sufficient lift capability. If engine runs, confirm this by

performing the tests on the following page.

Notes

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