Attention: Observe fire safety rules, do not work with open flame! To check the pump flow, the tank must be at least half full.
Remove the fuel pump relay.
Connect a voltmeter to the fuel pump. Close contacts 7 and 8 on the relay board.
The pump should start working, and the voltage on it should be at least 11.5 V. Otherwise, check the battery, respectively, the wiring according to the diagram.
Remove test lead.
Connect an ammeter to terminals 7 and 8. The current at the fuel pump should be approximately 6 A. If the current exceeds 7 A, replace the pump.
Unscrew the fuel return (51) from diaphragm pressure regulator (40). Screw a piece of hose about 50 cm long to the regulator. Tip: sealing cone with a union nut with a M14.5x1.5 thread. The tip is connected to the hose with a clamp. Hold the hose over the container.
Short circuit terminals 7 and 8 of the fuel pump relay socket for a maximum of 50 seconds.
The pump delivery should be approximately 1 litre. Otherwise, carry out the following tests:
- Unscrew the union nut from the fuel supply fitting to the dispenser, remove the mesh and blow it through, if necessary, replace it.
- Inspect hoses for kinks and creases, replace if necessary.
- Pinch the short hose on the fuel accumulator with a screw clamp and check the pump flow again. If the specified value is reached, replace the fuel tank.
- Replace the fuel filter and check the fuel supply again. If the flow is still low, replace the pump.
- Screw the pipe with a torque of approx. 10 Nm to the pressure regulator.
- Insert the fuel pump relay.