DISSECTING A FAILED BOSCH 044 FUEL PUMP 

There is a plastic valve on the out going fuel in neck of behind the coal connecter when it close fuel will stop to go out and engine fails.

There was some think as aplastic door closer in output of fuel if you watch there is a rubber in out door going of fuel which open and close for out going fuel

That's west I was gong to ask, genuine or counterfeit?

The little plastic is in the out neck of fuel Pumpe very thin rubber and black.

That little plastic in out door of fuel Pumpe to keep back fuel to pumpe is

That plastic in out going fuel is like second door of air in bycikel Airpumpe acts one door is for in and one door is for out

that's a Chinese copy