Complaint: starting problems

• Run engine briefly at idle speed and switch off.
• Note down measured value while engine is stopped.
• Read off measured value again after approx. 20 to 30 minutes while engine is stopped.

Special tool 13 3 010 (hose clamp) is required for the following test.

If the measured value has dropped by more than 0.5 bar: 

• Start engine and wait briefly for a stable pressure increase.
• Switch off the engine and immediately pinch off the delivery line just before the pressure gauge with the special tool 13 3 010.
• Note down measured value
• Read off measured value again after approx. 20 to 30 minutes while engine is stopped

If the measured value has now dropped by less than 0.5 bar, the following faults can be present: 

• Fault in delivery lines
• Fault in in-tank delivery hose
• Faulty pressure-holding non-return valve in fuel pump

Check components. Replace faulty components.

If the measured value has dropped by more than 0.5 bar again: 

• Replace pressure regulator