The sight gauges on my diesel tanks are so cloudy they are worthless.
They are made of some 1/2" plastic pipe and I want to replace them. The
company I'm dealing with is so gutless and liability oriented they won't
tell me whether diesel will destroy or erode their ester-based
polycarbonate tubing.

Is there anyone out there with a chemistry background with an opinion on
this?

Capt. Jeff