I'm not (yet) convinced that the old tanks do become brittle with age, mine is
a pre 2006 XS tank. The material I removed for the cut-out seems to be exactly
the same as a cut-out I removed from a new tank I purchased but didn't fit as
far as flexibility goes. What I did do was support the old tank as much as
possible
underneath and at the sides using non-expanding foam used in the building
industry.
As far as possible, I use non-ethanol forecourt fuel, maybe some other fuels
could
cause embrittlement who knows.
One thing is for sure, even if I have to fit a new tank sometime in the future,
I would still cut a hole in the tank top, it's great to be able to drain, clean
and inspect the tank properly.
You may be wondering why I cut a hole in the top of a new tank, the reason is
that
I was going to fit a bladder inside the original tank. This didn't work out
because I couldn't make a fuel-tight bladder and getting one manufactured was
prohibitively expensive. It remains an option though.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=482158#482158
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