Rust below fuel filler

[The Hoax]

Being a bit of an anorak, when I'm in scrappies, I pay attention to how Golf's rust out so that I can protect mine.

I have noticed that some even quite late mark twos are badly rotten in the rear quarter below the fuel filler. I have never seen a posting about this so , having just lost my virginity, I thought I would chuck in my tuppence worth.

This rust comes from the inside out and I am pretty sure that it is caused by the drain in the filler recess becoming blocked with road dirt etc. The water ponds in the recess and gets through the gasket at the filler neck and drips down inside the quarter panel.  If after rain or when you wash your car you open the filler flap and find a puddle then make sure you poke about with a bit of coat hanger to clear the blockage.

You won't be able to stop yourself from checking tomorrow will you?.

[Blue MK2]

on mine i have a rusted screw. maybe it starts from there?

[gti fly bye]

mk1's i here rust there and the filler neck, rust through then water gets in to the petrol and that aint good!

[Gambit]

aye done this a while back when my filler cap drain hole was blocked, stuck an allen key down in and big lump of solid muck dropped out the bottom

[turbo]

i dont think that hole being blocked helps..
the rust comes from the inside of the arch behined the rubber filler thing the rubber which connected the pipe to the bodywork.... mud builds up behined a rusts though......i think thats what happens as far as i know.