6.3. Check of pressure created by the fuel pump

PERFORMANCE ORDER
1. Remove a pillow of back sitting and remove the inspection panel of the fuel pump.
2. For removal of pressure in fuel system disconnect the socket of the fuel pump, start the engine and wait so far it will not stop in connection with fuel use from fuel-supply lines and the fuel highway.

Prevention

Before separation of fuel-supply lines take off pressure in fuel system, otherwise, the fuel which is under pressure will intensively follow from fuel system.


3. Disconnect a wire from the negative plug of the rechargeable battery and connect the socket of the fuel pump.
4. Connect the adapter of the manometer (09353-24000, 09353-24100, 09353-38000) to the fuel filter and tighten a fastening bolt the required moment.

Inhaling moment: 25-35 N • m

5. Connect a wire to the negative plug of the rechargeable battery.
6. Give additional wires tension to the socket of the fuel pump and check that there is no leak of fuel from connections of the manometer.
7. Start the engine and leave it to work at idling rotation frequency.
8. Measure fuel pressure.

Fuel pressure: 350 kPa
9. If the measurements executed in steps 7 and 8 do not correspond to the required value of pressure of fuel, define the reason and execute necessary repair.
Condition
Probable cause
Elimination method
Fuel pressure too low a. The fuel filter is polluted. a. Replace the fuel filter.
b. The leaks from fuel return caused by bad consolidation of the regulator of pressure. b. Replace pressure regulator.
Fuel pressure too high a. Sticking of the regulator of pressure of fuel. a. Replace pressure regulator.
b. The fuel return pipeline is hammered or bent b. Replace the fuel return pipeline
10. Stop the engine and in 5 min. on the manometer read value of pressure of fuel which should not change. If fuel pressure considerably decreased, define the reason and execute necessary repair.
Condition
Probable cause
Elimination method
Fuel pressure after a stop of the engine decreases slowly a. the fuel nozzle is untight a. Replace a fuel nozzle
Fuel pressure after a stop of the engine decreases very quickly a. The control valve of the fuel pump is open Replace the fuel pump
11. Take off pressure in fuel system.
12. Disconnect a hose and the manometer.

Prevention

Close connection by a towel to exclude the fuel spraying caused by residual pressure in a fuel-supply line.


13. Replace a sealing ring on the end of a hose.
14. Connect a hose to the fuel highway and tighten a connecting nut the required moment.
15. Check tightness of fuel system.