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Home >> Mercedes Benz >> 1989 >> 560SL >> Repair and Diagnosis >> Engine Performance >> System >> Basic Testing >> Fuel System >> Fuel Delivery & System Pressures >> Visual Check (Fuel Leak)
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Visual Check (Fuel Leak)

  1. Remove air cleaner and check for any visible fuel leaks. Remove fuel pump relay from relay board. Bridge terminals No. 7 and 8 long enough to establish fuel pressure.
  2. Push airflow sensor plate down manually. Uniform resistance should be felt throughout travel after slight amount of free travel. No binding should be felt when sensor plate is released. If upward movement of sensor plate is slow, resistance from control piston closely following adjusting lever should be felt. No binding should be evident.
  3. Push airflow sensor plate completely down and hold briefly. Slight fuel seepage past control piston is acceptable. If no fuel leaks are evident found, go to next test.