A mechanical fuel pump- paul-ryan.info Check the fuel-pipeclips for tightness. Inlet valve Outlet valve The pump diaphragm,omitted here for clarity, fitsunder the brass centre cupand its outer edge is heldbetween the two halves ofthe body. Use the operatinglever to checkwhether the pumpis working. Sometimes dirt canget into the valvesand prevent themfrom sealingproperly.
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Checking a mechanical fuel pump

If a car stops and has not run out of petrol, check whether there is petrol in the carburettor....