I have done a rebuild of my Zenith 40's for my 1971 911T (2.2L). After rebuilding, the right side accelerator pumps do not work at all.
Looking at a good breakdown of the carbs I am wondering if the accelerator suction valves are missing a check valve, or a ball to check flow when the diaphragms are pushed in.
Positive displacement pumps, piston pumps, diaphragm pumps, compressors, etc... always have a suction and a discharge valve. The discharge valve (ball type) appears to be in the injection tube (part #25 in the maintenance manual) , however the pump inlet valve (item #26) does not seem to have any type of valve. It looks like a jet that is screwed into the bottom of the float bowl, but I can not see any type of check or ball in it.
Does anyone have experience with the accelerator pump inlet valves? When I filled the bowls with gas on the bench-top and pumped I could see flow flowing back into the bowl, not down the throat of the carb.
New inlet valves? Bad reassembly? Bad luck??? I really need some help figuring this out.
As a side note I am going to miss a Loma Prieta PCA event this weekend I have already paid for (food, lodging, etc...) and would gladly hand it over to another enthusiast for 1/2 price... ($100) They are going to the 17 Mile Drive in Carmel, then overnight near Mission San Juan Batista.
If interested in the trip, please let me know. If interested in giving advice on the carbs, please do!!! I have got to get this thing running again!!!
Thanks,
Mike
