Inspection Of Fuel Pump - TOHATSU MFS25 Service Manual

Fuel System (Fuel Injection)

3) Inspection of Fuel Pump

1. Remove fuel hoses (2) from fuel pump.
2. Connect vacuum/pressure gauge to inlet of fuel pump.
3. Close fuel pump outlet with a finger and apply specified
pressure. Check if no air leaks.
Vacuum/Pressure Gauge :
P/N. 3AC-99020-0
Specified Pressure :
0.049 MPa ( 7 psi ) [ 0.5 kgf/cm
4. With the outlet closed, apply specified vacuum pressure to
check that no air leaks.
Specified Pressure :
-0.029MPa ( -4 psi ) [ -0.3 kgf/cm
5. Connect vacuum/pressure gauge to outlet of fuel pump.
6. Apply specified pressure to check if no air leaks. Replace if
necessary.
Air-tightness of fuel pump can be increased by
making the interior wet with gasoline.
Specified Pressure :
0.029 MPa ( 4 psi ) [ 0.3 kgf/cm
4) Inspection of Fuel Connector
1. Check fuel connector for crack and damage.
2. Connect vacuum/pressure gauge to outlet of fuel connector.
3. Apply specified pressure, and check if the pressure is
maintained for 10 seconds. Replace if necessary.
Vacuum/Pressure Gauge :
P/N. 3AC-99020-0
Specified Pressure :
0.029 MPa ( 4 psi ) [ 0.3 kgf/cm
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25/30 2006