Gas tank cap not clear anymore

[glen]

Gas came up into to fuel gauge part of the boat gas cap.  Now the clear plastic is not clear.  I can’t see how much gas is left.  Can it be fixed.  Maybe I’ll  buy a new tank if I can find one.   12L tank with the handle on top. 
 

 

[OMCDinosaur]

Try taking the cap off for a bit and put it in the sun for a while...usually condensation but alcohol may have degraded the plastic.   Try the sun for an hour or so...just the cap, otherwise replace the cap. Some tanks have serviceable parts, some not.

[glen]

I guess gas came though the vent and got on the outside of the plastic fuel gauge. 
 

I buffed it with some glass cleaner and now I can read it. So good for now