Quote:
Originally Posted by Crvett69
and some cars have a extra hose coming off the pump or carb going back to the fuel tank for the extra fuel thats not needed
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This keeps fuel circulating to prevent fuel overheating and vapor lock.
Cars that do not have such a return- line simply have the pump maintain pressure in the line, using a diaphragm and a spring. The pump actually stops pumping when the spring has adequate fuel and pressure in the line.