Fuel Pressure Measurement - TOHATSU BFT75A Service Manual

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FUEL PRESSURE MEASUREMENT

Gasoline is highly flammable and explosive.
You can be burned or seriously injured when
handling fuel.
• Keep heat, sparks, and flame away.
• Wipe up spills immediately.
• Handle fuel only outdoors.
Relieve the fuel pressure (page 5-66).
Remove the service check bolt and set the special tool
in the threaded bolt hole.
TOOL:
Fuel pressure gauge, 0 – 100 psi [1] 07406-004000B
Disconnect the pressure regulator control tube [1] from
the pressure regulator and clamp the tube.
Remove the propeller (page 16-3).
Set the outboard motor gear case in a test tank filled
with water. Start the engine and measure the fuel
pressure at idle.
Standard fuel pressure
[At idle speed of 750 ± 50 min
325 – 375 kpa (3.3 – 3.8 kgf/cm
When the fuel pressure is out of the specified standard
pressure, check the following:
• When fuel pressure is higher than standard
pressure:
– Check fuel return hose and fuel line for clogging.
– Check the high pressure side fuel pump for proper
operation (page 5-99).
• When fuel pressure is lower than standard pressure:
– Check the pressure regulator for proper operation
(page 5-98)
– Check the high pressure side fuel pump for proper
operation (page 5-99).
– Check the high pressure side fuel strainer for an
obstruction.
– Check the fuel hose and fuel line for leaking (page
5-3).
After measuring fuel pressure, install the service check
bolt (page 5-66).
-1
(rpm)]:
2 , 47 – 54 psi)
FUEL SYSTEM
[1]
[1]
5-97