T-

I had a similar problem on my Jetta, and the sender was the wrong one (this
was from the dealer as well. Beyond the stamping on the bottom with "bar"
rating, there *should* be a color difference. Mine is a Turbo Diesel and
they put a "gas" sender. Bzzzzzzzzzzzzzzzzzzz.

There are (believe it or not) at least four different colors for VW
pressure senders, each with a different pressure rating, blue, white,
black, and brown...don't ask which is which, you are just supposed to be
smart enough (as a mechanic) to put the same color back...kind of like
those kids clothes, Garranimals, you just match them up, Tigers with
Tigers, Giraffes with Giraffes, blue pressure senders replace blue pressure
senders.

Cheers,

G. Matthew Bulley
Bulley-Hewlett & Associates
www.bulley-hewlett.com
Cary, NC USA
888.468.4880 tollfree