I installed some new German fuel hose that release enough rubber partials that plugged the screen in the rebuilt injectors I installed when redoing a 914 fuel system.  I removed the injectors and its hose, hooked a MityVac hand vacuum pump to the injector fuel inlet and pulled a vacuum on it. Then I placed the injector tip in a solvent, ( I think I used kerosene ) and with 12 volts from a battery charger cycled the injector rapidly. I had a clear suction hose and could watch the kerosene fill the hose and back flush the injector.  The reinstalled injectors work just fine now at all speeds including full load at high rpm.
SBB

At 11:48 6/2/03 -0700, Brian brian wrote:
>So I'm going to have my injectors tested (new seals
>arriving tomorrow), and if any are leaking (a hunch)
>or have a poor spray pattern, I want to switch them
>out with some from my parts van, which also has at
>160K miles on it and has plenty of 'Michigan cancer'
>(rust) on everything. (I bought a southern van and the
>difference in rust quantity is amazing).
>
>So anyway, I took the whole fuel ring off my parts
>van; I couldn't get the screws to turn on the clamps
>holding the injectors to the ring and will probably
>saw them off. My question is, how can you clean an old
>injector? Is this worth doing? At $80 a pop from Bus
>Depot, I hope to avoid buying any new ones. Maybe I
>won't have to anyway, but out of eight injectors I'd
>like to run the best four I can.
>
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