Your EARLY GASOLINE Cart is very similar to the Fig 121 1908-1930, except your has the taller standpipe for hose connection w/o the BALL Expansion Chamber on top. BUT it also has an EARLY ID CAST TAG [raised Lettering, instead of ETCHED Background, shallow Lettering];
http://petrolianacollectibles.com/bowser%20121.htm
The Locking FLAP to left of hand crank is same as used on Early Fig. 41 pumps like one of the Sales Sample I have [2];