Parsun F40 EFI, Maintenance Manual

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3. Check the fuel joint for cracks or damage.
4. Connect a vacuum manometer to the fuel joint outlet.
5. Check whether the negative pressure can be maintained for more than 10 seconds
under the specified pressure. Replace it if necessary.
Specified pressure: 50kPa
Removal and inspection of fuel pump
1. Remove the bolts securing the fuel pump.
2. Remove the fuel pump.
3. Connect a vacuum manometer to the fuel pump inlet.
4. Plug the outlet of the oil pump with your fingers and apply the specified positive
pressure. Check for air leakage.
Specified pressure: 50kPa
5. Apply a specified negative pressure. Check for air leakage.
Specified pressure: 30kPa
6. Connect a vacuum manometer to the fuel pump outlet.
7.
Plug the inlet of the oil pump with your fingers and apply a specified negative
pressure. Check for air leakage.
If necessary, disassemble the oil pump and check it.
Specified pressure: 50kPa
8. Remove the 4 bolts and separate the fuel pump cover and from the fuel pump seat.
9. Remove the valve plate screw from the fuel pump body and remove the valve plate.
10. Press down the plunger and diaphragm and rotate the fuel pump seat to align the
notch with the groove on the plunger. Remove the roller pin.
11. Check whether there are cracks in the diaphragm, whether the rivet is loose, and
whether the valve plate is damaged. Replace it if necessary.
12. According to steps 8-10, assemble the oil pump in reverse sequence.
Filter inspection
Check whether the filter screen is blocked or there are sundries in it, and check whether
the filter bowl is damaged or leaked.
If necessary, clean it with gasoline or replace it.
Note:
Before reassembling the filter bowl, apply lubricating oil to the O-ring.
１.
Oil filter lid
２.
Filter screen