Review on STMGW Priming Transfer Kerosene Biodiesel by Brian Fishel

Mine does not self prime, I had to undo the caps on the pump to deflate the pump, this is not recommended and should not be necessary for a self-priming pump unless you are in a hurry, anywhere run out of fuel. The quality of the drain hose and nozzle is good, that's all. Once you fill it up, it will flow fine, but once you stop it, it will quickly lose its original appearance, and then you'll have to fight to restore it. I had to return this pump, I think you get what you pay for. Much luck.