As of now, I can not leave the trigger locked in or it will either stop itself; or spill fuel over my fender. I have only used super unleaded and unleaded in my car, though, I always configure the pump to an even dollar amount, tried a few times to fill it to the fullest, and occasionally pour seafoam into the tank. Can anyone please tell me what is wrong, what is a wrong with what I am doing, and possibly part number(s). Hopefully I could fix this myself, just tell me from personal experience. Really appreciate the replys!