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

Al there appears to be two issues with ULSD. Lubricity is one and the
'reduction of aromatics' is the other. There are additives for additional
lubrication but nothing to increase the aromatic content back to pre-USLD
levels. Aromatics cause seals and gaskets to swell. This is a known factor
and engineers designed their pumps seals and other fuel component gaskets to
accomodate the degree of swelling that occurs. With the advent of ULSD and
the corresponding reduction in aromatics came some seal/gasket issues. In
certain cases the seals shrunk due to decreased aromatics and allowed
leaking to occur. This is how it was explained to me so if I have this wrong
I'm sure someone will enlighten me.

On 21/01/2008, aw_florida <al2florida@gmail.com> wrote:
>
> 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.
>
>
>

--
Rob, Sue & Merlin Robinson
94 WLWB

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