[Vwdiesel] pump numbers

[Scott Kair]

 >I have a old style fuel filter housing
> I want to install instead of the newer style. The newer style has an
extra
> line that I don't know what to do with but will figure it out.
>
> Bart<<

    The newer style incorporates a thermostatic wafer in a plastic
housing that runs return fuel from the pump back through the filter at
temps below 50F.  IIRC, two of the fuel lines are coupled to the
housing, which sits atop the filter.  Over time, the plastic gets
brittle and cracks or breaks when you try to tighten the line clamp.
    The new style doesn't become apparent until the thermovalve
housing cracks and leaks, or when you find out the filter is more
expensive and the housing a dealer-only item, or when the temperature
gets below about 10F.
    At cold outside temps, you get warm fuel to the pump pretty
quickly, rather than the cold stumbles for several minutes.  Replacing
the newer style with the old involves a bit of re-plumbing the extra
lines, and does save money and increased risk of leaks, but a couple
of mornings at -10F made me a believer in the newer style.
    HTH,
    Scott Kair