If the machine had just been away to the coachmakers it is likely that the poly bag got in there.
They cover the fuel hole with a poly bag and a rubber band to protect the rubber seals etc while painting. Unfortunatly when they cook the paint the tank heats and vents then when it cools it sucks the bag in.
The caps are like hens teeth to get a new one if yours is nicked. Its not unknow to stick a tesco bag in the hole to stop it venting when driving down the motorway. It usually doesn't matter because the fuel strainer catches it.
It could have been in there for years. After a fuel tank split I had fag ends poly bags and a tampon!!!! dumped out the bottom But I do know what they used the tampon for.
Last edited by mad_jock; 30th Apr 2008 at 11:47.