TOHATSU MD 70-90C2 Service Manual page 114

Fuel System (TLDI)
How to Use Pressure Gauge
1. Pressure Gauge Ass'y
Measurement of Fuel Pressure and Air Pressure
1. Set the lever (3T5-72883-0) to position "A" shown below.
2. Screw adapter B (3T5-72884-0) into a valve of air rail for measuring air pressure or fuel pressure.
Be careful of fuel that spurts when
screwing the adapter into the fuel
pressure measuring valve.
3. Turn key switch from "OFF" to "START" position to crank the engine for approximately 15 seconds. (Run the engine
for 15 seconds at idling speed of 700 r/min.)
4. The fuel system and air system are normal when the gauge indicates specified air and fuel pressures.
(If the measurement of the pressure is out of the specified range, troubleshoot by referring to this service manual.)
Pressure Measurement
AIR PRESSURE
FUEL PRESSURE
5. After the measurement, set the key switch to "OFF", cock lever to position "B" to release the inner pressure, and then,
remove adapter B from the measuring valve.
After measuring the fuel pressure, use a container to catch fuel that flows out from the tip of hose when the cock
lever is set to position "B" (open). Bring cock side below the valve to drain fuel completely from the hose before
removing adapter B.
Valve Ass'y
Valve for measuring air pressure
or fuel pressure
4-40
WARNING
Typical Value
0.65 MPa (94.3 psi) [6.5 kgf/cm
0.72 MPa (104.4 psi) [7.2
kgf/cm ]
2
Position of lever for pressure
A
measurement (closed)
Position of lever for releasing
B
pressure (open)
Cap
Air Rail Ass'y
Specified Range of Pressure
0.61 - 0.58 MPa (88.47 - 101.53 psi)
]
2
[6.1 - 7.0 kgf/cm 2 ]
Air Pressure
+0.06 - 0.08 MPa
(8.70 - 11.60 psi) [0.6 - 0.8 kgf/cm
Adapter B
Replace following parts if air or
fuel leaks with the adapter
perfectly screwed in.
Seal Joint
Remarks
The pressure reduces
gradually after stopping
the cranking.
2 ]
TLDI 75/90C2 2010