[sergioautoshop]

I recently replaced the Fuel pump on a 2004 C240 because i couldn't get the car running. Got the car to run but once i turn the engine off. the fuel overflows into the engine and have to manually extract it from engine. anyone know what might be causing this issue. look forward to suggestions.

thanks,
Oz

 

[khomer2]

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[cdcjr63]

Possible 1 way check valve or the pressure regulator. I would chk fuel pressure and make sure it maintains pressure after shutting down vehicle.

 

[record10carvon]

I recently replaced the Fuel pump on a 2004 C240 because i couldn't get the car running. Got the car to run but once i turn the engine off. the fuel overflows into the engine and have to manually extract it from engine. anyone know what might be causing this issue. look forward to suggestions.

thanks,
Oz

I put one in my (old) car not too long ago. I would almost guess that your return is blocked or not connected...that would be my only guess. But, why would it pass the injectors and not just pressurize and ruin the new pump?