Remove cover -1- with fuel pump control unit -J538--2- from fuel delivery unit.
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First check that the connector -arrow- is fitted securely by pulling the connector without pressing the catch. If connector was not inserted correctly, repeat functional check of fuel pump.
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Now pull off connector.
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Check the contacts on the connector and on the fuel delivery unit for damage.
WARNING
Fuel supply line is pressurised. Wear eye protection and protective clothing to avoid possible injury and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection.
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Pull fuel lines -1- and -2- off flange. Detach push-on connectors → Chapter
Note
On vehicles with auxiliary heater the connector and the fuel line of the metering pump -V54- must also be separated.
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Open locking ring using wrench -T10202-.
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Check that electrical wires between flange and fuel pump are connected.
If no open circuit can be found:
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Fuel pump defective, renew fuel delivery unit → Chapter.