When trying to fill up with gas, the pistol nozzle pops off every few seconds. Very difficult to fill with gas unless you are filling very slowly.... Almost 15 minutes just to top off the tank from empty. This has happened at just about every gas station I go to. The matter is getting worse. It seems like there might be a restriction in the fill line to my gas tank which is causing the gas to splash back up and hit the nozzle. I know these nozzles are designed to shut off automatically when they are hit with gas. (or possibly gas vapor?) Solutions .... anyone????