I  picked up a  couple  'leaky'  cast iron 'banjo' pumps  from the  co-op   for  scrap price.   Easy to find  Viton  seal kits for  converting to  petroleum duty.    

Bolted up to  a  Honda clone.    

I will say you have to hang on to the nozzle,  it's got quite a kick.     It will  foam up the fuel quite a bit  when  pushed  much above   idle speed.