Hi, kind of normal, have no worry unless they are deform/melted.

The reason is simply heat! With time, all those "fuel flooding" and back
fire cause this, heat gos back into the intake plenum. Intake valves not
seating properly can also cause that kind of problem, hot gas make their way
back up on deceleration / cold start... I also blame poor sealing of the
injector tip , that little O-ring.

Most, not to say all vanagon engine don't have a properly sealed FI system.
If the injectors are the faulty one, overnight a certain amount of fuel
flood the combustion chamber, so in the morning that extra fuel need to burn
someways.

In your case, i'll bet you that this injector is not sealing/closing properly.
A pressure test could confirm that.
http://www.benplace.com/fi_test.htm

Cheers, Ben
http://www.benplace.com

n Sun, 25 Oct 2009 21:22:50 -0400, Mark <mbrush@GMAIL.COM> wrote:

>Got all the fuel lines to the fuel rail and the fuel injectors replaced
>(along with the seals).  New gas tank is next.  Wohoo!
>
>One of my injectors was discolored.  The plastic was brown instead of
>white/tan like the others.  Anyone know what this is a sign of?
>
>--
>Mark
>1990 Westy (2.1 - manual)