Rebuild kit for the P34-PB2 # D11023 Dellorto fuel pump , the kit includes the 4 rubber gaskets the 2 diaphragm sheets and the 2 rubber umbrella type check valves. This impulse pump works on pressure pulses from the engine inlet, these pulses move a diaphragm inside the pump which pushes and pulls petrol through two one way valves providing a steady flow of fuel, It also includes a pressure relief valve to prevent over fuelling
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