First, I did not say my FD was "that gunked up." I only set out to test if I can wash ANY residue out of an unknown condition FD.

I cleaned mine on the bench (off the car). In my tests the only way to draw sufficient quantity of Yamaha carburator cleaner - not spray brake cleaner - into the chambers was by extending the plunger far beyond where it can travel when mounted on the AFM.

If you spray and pulse the AFM plate (what you are calling diaphragm), you'll get _something_ in, but I would not rely on that method.

My test was successful in that it reached its objective - I was able to inject cleaner, and then to purge out some contaminant. Furthermore, the cleaned FD is now operational, in the car. However, I have yet to apply this method to a KNOWN bad FD. That test is planned but not yet scheduled.

bostonmish