[copper]

I know this thread has been repeated over and over as I have read many of them and obtained some good info.

My 69 911T has been having some rough running problems. Gone through many options, but after speaking with some other members and reading different threads, I think there may be some rust problems in my tank.

When I took the fuel sender out to replace the gasket, the bottom 1/4 of the sender was covered in a reddish brown coating. I presume this is rust related.

Questions:
1. What is the best way to inspect the tank for rust. (I'm sure it exists, more interested in the level of deterioration.)
2. Once I replace my fuel filter, being a sealed unit with the two nipple like ends, is there a way to determine if there are particles in it?
3. How do I access the filter screen within the tank proper, and how do I assess whether it needs replacing?

Thanks
Jim