Yamaha F150 Wartungshandbuch PDF herunterladen (Seite 76)

FUEL

Fuel system

4-13

63P3F11

Measuring the fuel pressure

1. Remove the cap

1

.

2. Connect the fuel pressure gauge to the

pressure check valve.

WARNING

• When connecting the fuel pressure

gauge, first cover the connection

between the gauge and the pressure

check valve with a clean, dry rag to pre-

vent fuel from leaking out.

• Gently screw in the gauge until it is

firmly connected.

3. Turn the engine start switch to ON, and

then measure the fuel pressure within 3

seconds.

NOTE:

The fuel pressure decreases 3 seconds after

the engine start switch is turned to ON.

4. Start the engine, warm it up for 5 min-

utes, and then measure the fuel pres-

sure. If below specification, check the

high-pressure fuel line and the vapor

separator.

WARNING

• Before measuring the fuel pressure,

make sure that the drain screw is tight-

ened securely.

• Do not loosen the drain screw while

measuring the fuel pressure. Loosening

the drain screw can cause fuel to spray

out creating a fire hazard.

• After measuring the fuel pressure, cover

the end of the hose with a clean, dry rag,

point the hose downward, and then

loosen the drain screw to drain the

remaining fuel from the hose and gauge.

• When storing the fuel pressure gauge,

make sure that the drain screw is tight-

ened securely.

Checking the pressure regulator

1. Remove the cap

1

.

2. Connect the fuel pressure gauge to the

pressure check valve.

3. Disconnect the pressure regulator hose,

and then connect the special service

tools to the pressure regulator.

Fuel pressure gauge: 90890-06786

Fuel pressure (reference data):

310 kPa (3.1 kgf/cm

2

, 45.0 psi)

Fuel pressure (reference data):

260 kPa (2.6 kgf/cm

2

, 37.7 psi)

S63P4130

1

Fuel pressure gauge: 90890-06786

Vacuum/pressure pump gauge set:

90890-06756

S63P4140

1

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