Pump scheme:
1 - sealing cuff,
2 - diaphragm,
3 - inlet valve,
4 - inlet tube,
5 - fuel return pipe,
6 - fuel return tube jet,
7 - graduation (pressure) valve,
8 - exhaust pipe,
9 - pump lever.
Removing the fuel priming pump
1. Disconnect the fuel hoses from the pump.
2. Remove the pump along with the gasket or insulator by unscrewing the two bolts.
Pump test (tightness test)
Perform the following steps before performing a basic pump check:
- A) Run some fuel through the pump to make sure the pump valves are working properly (dry valves cannot work properly);
- b) Without blocking the pump tubes, operate the pump lever to assess the amount of force applied and the play on the lever; the same force should be applied when checking the pump.
1. Check intake valve. Close the outlet pipe and fuel return pipe with your finger and press the pump lever once or twice; make sure that the free play of the lever increases and that there is no force on the lever.
2. Check the release valve.
Close the intake tube with your finger and make sure the lever is locked (the force to move the lever has increased compared to that which took place during preliminary checks).
Attention:
- Never apply more force to the lever than was the case when pre-testing the pump.
- This also applies to points 3 and 4.
3. Check aperture.
Close the inlet and outlet pipes and the fuel return pipe with your finger and make sure the pump is blocked. Attention: if the results of the previous checks do not meet the requirements of the technical specifications, then the tightness of the pump is broken.
4. Check the sealing collar. Close the vent and make sure the pump is blocked.
Installing the fuel priming pump
1. Install the pump, after installing new gaskets and insulator; fasten the pump with two bolts.
- Tightening torque - 18 Nm
2. Connect the fuel hoses to the pump.
3. Start the engine and check for leaks.