My mk6 RS2k has been having a starnge running fault recently, so i decided to drop the tank and see if the intank filter has blocked.

the filter bag on the bottom was fairly furred up, so i clean that up. what has surprised me is what i have found in the tank...


The white bits are from the sides of my tank (in a plastic cap, where i tried disolving them)


swirl pot


Inside the tank, the silver bit at the bottom is where i could scrape with a screw driver.

Its like lime scale or something. a thin white layer over the entire inside of the tank. not on the swirl pot at all, just the metal. i've cleaned off as much as i could, and removed anything loose with compressed air.

its been refitted and refilled for now, and i haven't had a performance problem at all, but who knows how long before it get worse again?

any ideas what would cause this?

 

does cheap supermarket fuel cause this?? just a thought?

 

looks like the hard cack you get in old carbs , a kind of petrol scale ?

 

not seen that before. had the tank off my saff when i refurbed it, and it was mint inside, none of this stuff.

if it is a sort of scale, will anything dissolve it?

 

saw this once myself in a RS16i and thought someone had dumped some crap in my tank, hope you changed the fuel filter too

 

filter was changed last week, that was my first inkling that it might be fuel related, as i got a load of dirty crap out the intake side of the old filter. lumps that looked like wax, but crumbled into fine powder.
i flushed out the new one, today, though. its a pain in the ass trying to faultfind your everyday car...

 

I have seen this before on some old motorbikes and it is down to ethanol they are now putting more in petrol and it eats the fuel system on older cars.

http://www.jawaczownersclub.co.uk/te...l_advice13.htm

 

interesting read. its still driving fine, so will have to keep an eye on it