The fuel pump is secured with two nuts through a heat-insulating spacer and an annular gasket. The pump body and cover are non-separable, i.e. the fuel pump design is non-disassemblable and cannot be repaired.
Connect the pressure gauge hoses to the carburetor and fuel pump.
Start the engine and measure the boost pressure using the pressure gauge: it should be in the range of 0.20-0.25 kg/cm².
The pressure at the fuel pump outlet is not regulated. If the pressure drops below the permissible value, replace the fuel pump.
Checking the fuel pump discharge pressure (Audi 100 C3)
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