I've noticed if your diaphragm is leaking for any of the two or three reasons it may be happening, you will see the gasket shown below get wet while your engine is running and it will remain wet when you stop running for a while. This seems to me to be a very clear barometer. Also there is shown with a red arrow one of the lower screws. You may also notice this is wet with fuel and in one case I noticed one where fuel was actually dripping off the bottom of it. If anyone wants me to resurrect the instructions on making the "bonnet" flat and to see some of what I found there, please let me know.
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
