Adjustable pressure relief valve, and how it is mounted

Fuel pump part no. 4012, the pipe be twin Pump & Motor have to be in rubber & 75 mm. long, 

It is very important that the tube not is longer, because the fuel pressure will be lover and lover the longer the tube is. 

Adjust the arm for the needle valve: 3 mm. from the edge of the carburetor without the gasket. 

You can use a 3 mm. Alan key as you can see on the photo.

It have to open as you can see on this photo.