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Fuel Injector Question?

Have you ever tried to check injectors for leakage by using compressed air.
Tonight I rigged up an air regulator to test the 8 spare injectors I have as I
think I still have a leaky one and am trying to find a better way to test

I put a little amout of soapy water (soap suds) on the end and slowly brought
up the air pressure from 40-60 psi.  All six injectors would open right at 60
psi. When I reduced the pressure down to 40 psi I could still see a slight
anount of evidence of leakage in the tip.  All 8 injectors did this. Granted
they are used injectors but I would think there would be at least one good

Littleton, CO