Thats not good! "Plastic Welding"

[cully]

just had a go at fixing this
have not filled it back up yet but fingers crossed

after watching son videos on youtube i decided to have a go

so heres the quick guide

Tools
wickes 2000w paint stripper gun
jigsaw
hand grinder
large flat screwdriver
water pump

pumped out tank to below crack line.
used grinder to clean crack area and under cut the crack.
cut up strips of the same plastic from the lid.
warmed area with heat gun.
feed in plastic careful not to get it to hot or the plastic runs.
work into the desired shape with the flat of the screwdriver.
carefull not to get the screwdriver too hot or the plastic sticks to it