[Diesel-RVs] What does ULSD have to do with a leak in ISC engine fuel lift pump??

What does ULSD have to do with a gasket leaking on a fuel pump?? I
have seen a lot of discussion about the lack of lubricity of ULSD, but
I fail to see what that has to do with a gasket leaking. Maybe I am
missing something here.

This is the thread where I saw a discussion about the leaking fuel
pump:

http://autos.groups.yahoo.com/group/Diesel-RVs/message/82540

Message number 82540 discusses a leaking fuel pump. There is a
reference to Cummins Bulletin 06T5-18 in this thread. The main part
of the bulletin is about a new gasket.

Al
2003 Phaeaton with ISC 330 engine.

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