[Vwdiesel] A2 fuel filter control valve

[Scott Kair]

    My 92 Jetta has been weeping fuel at the filter so I decided to change
it as it's of unknown age.  When I pulled the pre-heater/control valve off
the filter, the valve came apart.  The metallic disc, which I took to be a
thermostatic expansion device, rolled off into the netherworld of the engine
bay.  Between the halves of the control valve there was residue of what
appeared to have once been an O ring.
    Naturally, it leaks worse now.
    Does anyone know of a source for the valves outside a dealer?  I tried
Jack Ewald, but he doesn't stock them.
    TIA,
    Scott Kair