First I'd make sure the tank is completely clean. Sounds like non ethanol E10 ain't available in your area so unfortunately you are stuck there. I'd search for a pump built with the modern ethanol compatible neoprene/gaskets etc and that any neoprene lines are made of the good ethanol compatible stuff. I believe stabil only prolongs the storage life of gasoline but does not make ethanol any less hazardous to pump gaskets/valves. & there is a bottle of stabil available that says for ethanol but same deal it is to enhance the storage life of ethanol not to help combat ethanols' corrosiveness.