Leaking Fuel P 99 TD, Help

[oldwheels]

I want all the combined knowledge of resident guru's here. The tricks, pitfalls, cautions and exlpecit insights. I have come to the mountain seeking the guidance. Yes, I search the forum for past referances.

MY 99 300 TD fuel pump O rings are leaking again. LAst year the dealer charged me $700 to fix this and I'm not going thru this again.
I searched the parts online and see only one O ring listed. So here are my questions.

1 What is the size and material of the O ring?? I want to get better replacements

2. How in world can I get to the lines with out removing the intake manifold?? The dealer didn't remove the manifold.

3. any potential problems or traps?

4 Should I do anything else?
5 Should I replace all of the O rings??

Thanks in advance, free beer on me!!!