What, if anything, does this mean?

Yes when the fuel gets near the top of filter its time to change it, your are near that time to change your filter now!

 

Nothing, it has a bypass in the filter.

That's a secondary filter, so get it changed when you can.

 

I think if it gets full it will bypass the filter and you will have unfiltered fuel going to the main filters. But you should be ok for today

 

It explodes.

 

error

 

It won't hurt anything, just get it changed out like others said.

Transparent is so you can see water levels (it collects at the bottom and can be drained) and so DOT can see if it is stained red from running offroad fuel.

 

If you actually change it yourself, have a bucket ready to catch the diesel. I watched some clown take the filter ring off and had diesel all over the place, he just dumped the filter, put the new one in, closed everything up and had a cop standing there when he could not get his truck started to get out of there.