old pumps...
We had several hand crank pumps for 55 gallon drums at the boneyard..all went south fairly quickly except one old Lincoln brand one --we found it in the back of an old delivery van!..it was cast iron and very rugged...leaked at the shaft seals some though...we were still able to buy parts for it,and it was made in the early 60's!..
We tried making a lot of home brew pumps to empty the gas tanks of junkers people hadn't bothered to pull..we used a small block water pump,powered by a drill,but it caught fire and almost burnt the shop down when gas spilled ,and was ignited by the drill motor's brushes..

..strike one!..
We wasted a day building one out of a power steering pump..couldn't use it,it had to be primed every time,it was a PITA..we used a hand crank to turn it...it did pump ok once it was primed,but we had second thoughts about the steel vanes in the pump,and what could happen if a spark was ever produced..best to use a brass impeller pump if possible,to avoid an explosion!.

strike 2!..
Then we robbed a water pump from a scrapped slide in truck camper...it was great,used 12V,had half inch I.D. hoses,and pumped 3 times faster that the trickle we were getting from a universal electric fuel pump we were using!..but it didn't like gasoline,I guess it softened whatever the impeller was made of,and it slowly came to a halt,and started humming and smoking!..

strike 3!..
We never got to try it,but we were planning on trying an oil home oil furnace pump for the hell of it...they are designed for fuel oil,so I'd say it would be safe with gas too (a lot safer than an old RV water pump anyway!)..but they put out 100 lbs pressure,to make the fine mist so the oil will burn..I assume if you took the nozzle out,and reduced the pressure somehow,they would make a decent fuel pump too...maybe an enclosed heater motor or radiator fan motor could power it..less danger of sparks!..
I've looked in lots of catologs,nobody makes a good affordable petrol pump that holds up for very long..most of them are plastic crap..iron ones are about extinct I guess..and 99% of all other pumps say "NOT FOR GASOLINE" on them...sigh..
