I recently screwed about for a couple of hours attempting to remove all fuel from my motorcycle tanks using bulb type siphon devices and letting the cycles run until tanks were empty. These devices sort of worked,,,but difficult to maintain siphon for last 1/2 gallon or so.

Never again to waste this much time. Had a supercharged Jag XJR one time where both in tank fuel pumps had failed,,,,tank had to be removed to replace them,,,,yes I know it's a Jag,, and the tank had some 15 gallons of fuel in it. A real pain in the [censored].

https://www.amazon.com/gp/product/B00QSPU0NS/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

Used this to refuel cycles with fresh gas from one of my cars. Yes likely cheaper to buy an electric pump,,,but like the idea of portability in a hard case that I can just throw in the trunk to help others or myself in an out of fuel emergency.