I filled my Kolb by pressurizing a 5 gallon gas can with a foot pump (the kind made for air mattresses). I did some measuring, and a sealed gas can ballooning up in the summer sun gets up around 5psi so that much is obviously safe for the can, and is plenty to push the fuel up to my tanks. A hose and a brass ball valve, and a homemade fitting to hook the hose through the cap, were the only other parts.