Disconnect the fuel drain hose from the fuel dispenser.
Attach a hose to the fuel drain fitting of the fuel dispenser and place a measuring cup under its free end.
Turn on the fuel pump directly as described above.
With a half-filled fuel tank, about 750 cm³ of fuel should flow into the measuring cup within 30 seconds.
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Checking the performance of the fuel pump (BMW 3 Series E21)
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