TOHATSU BFT115A Service Manual page 246

FUEL SYSTEM
FUEL PRESSURE MEASUREMENT
Gasoline is highly flammable and explosive.
You can be burned or seriously injured when han-
dling fuel.
• Keep heat, sparks, and flame away.
• Wipe up spills immediately.
• Handle fuel only outdoors.
Relieve the fuel pressure (page 5-79).
Remove the service check bolt and set the special tool
in the threaded bolt hole.
TOOL:
Fuel pressure gauge (1)
Disconnect the pressure regulator control tube (1) from
the pressure regulator (2) and clamp the tube.
Remove the propeller:
– Standard rotation type (page 16-6)
– Counter rotation type (page 17-6)
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
270 – 320 kpa (2.8 – 3.3 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
(page 3-27).
– Check the pressure regulator for proper operation
(page 5-129).
• When fuel pressure is lower than standard pressure:
– Check the pressure regulator for proper operation
(page 5-129).
– Check the high pressure side fuel pump for proper
operation (page 5-130).
– Check the high pressure side fuel strainer for an
obstruction (page 3-26).
– Check the fuel hose and fuel line for leaking (page
3-27).
After measuring fuel pressure, install the service check
bolt (page 5-79).
Connect the pressure regulator control tube to the
pressure regulator.
5-128
07406-0040004
-1
(rpm)]:
2 , 40 – 47 psi)
(1)
(1)
(2)