... with small size, light weight, transfer diesel oil, gasoline, kerosene and other light oily liquid. Self priming, rotary vane ... rotary vane pump, steel rotor.3. Bypass valve built in.4. Built in filter, easily accessible for cleaning.5. Self priming: ... pumps, fuel transfer pumps, fuel flow meter, oval gear flow meter, turbine flow meter, positive displacement flow eter, fuel nozzles, fuel dispenser ...