I have always wondered why people buy the tank. I guess some people don't mind blowing money. It takes all of 30 seconds to remove the baffle inside. I was always told not to go below 1/8 of a tank. I tested it numerous times and it seems to operate just as it did with the stock pump I've ran with the fuel light on for a while a couple of times. Unless I have to, I just keep a sufficient amount of fuel in my car anyway. I'd hate to spray and run low on fuel, it could get ugly.