On this subject, I have a lot of 'crud' in my tank which keeps blocking my
filter.  The tank is a replacement one and looks good on the outside.  You
can hear the pump cavitating as it tries to pump the gas (strange humming
noise), due to the filter getting blocked and restricting flow.  The end
point is restriction in flow to the point that the engine cannot accelerate
due to the injection pressure being too low.
The crud in the filter is rust - how do I clean and rust-proof the inside of
the tank - can it be flushed by someone without removing?  Or should I pull
it and flush with rust proofer?
TIA
Michael
1981 Westy 'Daisy'