I’m just wondering what you guys are using just before your burner? Tank? Off-the-shelf jerry can? Or homemade tower of power... LOL. or just sipping out of a 5 gallon pail. - Those that are using propane probably have a little bit of a problem in the middle of a melt swapping tanks. - Those who are using gravity feed are playing with variable pressure during a melt... (like Jason) could just walk over and top up his tank during the burn. - Those who are using pumps could top up their fuel at any time... (like Dennis) - Those who are pressurizing their fuel tank with (air compressor compressed) air would have the same problem as those that are using propane when topping up their tank in the middle of the melt. As well, I’m wondering what kind of line/hose are you delivering the fuel (diesel, propane, WO, WVO) with, and what’s OD/ID?(polyurethane, polyethylene, vinyl, rubber reinforced fuel line...) I seem to have no problem delivering diesel fuel 300 mL per minute(or 5 gallons per hour). When it comes to waste oil (or waste vegetable oil) the viscosity through the same lines as the Diesel, I’m getting around 80mL per minute(or 1.25 gallons per hour). The choker for me on this whole equation is the brake line ID is only 1/8 of an inch.