Checking The Fuel Filter; Checking The Intake Manifold; Checking The Air Pressure Sensor; Checking The Isc Valve - Yamaha F150A Service Manual

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6. Remove the drain hose "1" and fuel hose
"2".
7. Disconnect the fuel hoses "1", "2", and
"3", and remove the fuel filter "4".
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8. Remove the fuel hose "1" and pressure
regulator hose "2".
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9. Disconnect the fuel pump coupler "a".
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Intake manifold and vapor separator
10. Disconnect the vapor gas hose with filter
"1" and vapor gas hoses "2" and "3".
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Checking the fuel filter

1. Check the fuel filter. Replace the fuel fil-
ter if there is dirt, residue, or external
damage.

Checking the intake manifold

1. Check the intake manifold. Replace if
cracked or deformed.

Checking the air pressure sensor

1. Check the air pressure sensor exterior.
Replace if cracked.
2. Check the electrical performance of the
air pressure sensor. See "Checking the
air pressure sensor" (5-24).

Checking the ISC valve

1. Check the ISC valve exterior. Replace if
cracked.
2. Check the electrical performance of the
ISC valve. See "Checking the ISC valve"
(5-15).
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