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

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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).