The injectors get 12 volts.
My concern is the duty cycle though.  The voltage is pulsed, not continuous.
The Vanagon injectors may be robust enough to take continuous voltage for a
few seconds, but I'm not sure.
I suppose the momentary switch and a fast finger would suffice.

I have checked injector patterns by simply plugging a spare test harness to
the injectors and tapping the positive wire on the battery terminal.
This is done off the vehicle with the injectors plugged into a spare intake
manifold and fed fuel pressure.
I haven't killed any injectors yet, but YMMV.

I really like the idea of back flushing the injectors.  That should really
help clear debris as opposed to trying to push it through.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Stuart Fedak
Sent: Tuesday, July 23, 2013 10:54 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Vanagon fuel injector cleaning

I am in the process of replacing the engine fuel lines in my 86 Vanagon 2.1
GL.  Any recommendations on what process should be used for cleaning the
fuel injectors once they are removed.

I did a quick search on YouTube and did find some videos that show the use
of a 12 VDC wall wart transformer, a momentary switch, and a syringe/hose
that is used to hold brake cleaner fluid.  The process that was demonstrated
showed forward and reverse cleaning of the fuel injectors.  Is this a
recommended process.

Is there any polarity concerns with the fuel injectors, and is 12 VDC
acceptable?  One video showed the use of just a 1.5 VDC battery.  What is
the usual voltage used to feed the injectors?

Cheers!
Stuart

Sent from my electronic umbilicus