13 31... Notes regarding the fuel pressure test (reference pressure: surrounding area): Attention

There is a low probability that the return line is completely closed due to obstruction. Fuel would then leak out under pressure when the pressure regulator is removed!

• Have a cleaning rag ready and catch and dispose of escaping fuel.
• Do not replace the pressure regulator. Replace the return line instead.
• Let the engine run briefly at idle and then stop the engine.
• Write down the measured value at engine standstill.
• Read the measured value again after about 20 to 30 minutes at engine standstill.

The following check requires special tool 13 3 010 (hose clip).