RON430

Both my GS430 and my wife's GS300 have no engine mods whatsoever.

RON430

When this first happened I tried every nozzle I could find. I tried every possible combination of holding the nozzle, pulling back the rubber hose seal, etc. Nothing worked. In to Lexus where they said there was an internal check valve at the bottom of the filler hose and that a piece of paper had gotten stuck on it and the check valve was then stuck closed which would cause the gas to run back up the filler and the nozzle would shutoff thinking it was full. They claim that they clean the check valve and that fixes it. I could have written it off to my or something I did or a particular station until it happened to my wife's GS3. And of course, it has happened to both cars again. Neither car has had this problem until the last year or so and we have owned both since new, my GS4 since 2k1 and the GS3 since 2k3. I have the Lexus manuals for these cars and the fuel system diagrams do not show any check valves anywhere. Not saying they might be there, but they aren't in the service manual. And when I use a wire to go down teh filler, it doesn't hit anything into the tank. I have a feeling it is something in the vapor return but just don't have the interest in figuring it out. Don't want to pay $200 each time to have Lexus fool with it either.

I know there has been at least one other thread about this but evidently no one really has this problem. I am already past the point where I will be trading my car in so it will go shortly and my wife's will go not long after that. Guess I will just live with it. At least this time Magnussen Lexus didn't charge the $200 they have charged me in the past to fix it. But if I were just a bit more paranoid I would be thinking about something in the GS fueling system that gets hinky when it gets five or six years old. And I doubt Lexus will do anything to fix it. Glad no one else has a problem.