I'm still reading replies and searching for a cure
but wanted to add a couple points...
1--regarding a tuneup workshop for Zeniths (all kinds) - that is an excellent idea.
I hope I have not sounded negative on the idea, and hopefully I've not said anything more rookyish than usual.
At one time I had a copy of the zenith WIP WIA factory tech bulletin and I'll search if anyone is interested in a fax or a scan.
2--I bought the biggest screw driver I could find that will fit a fuel line clamp and put a big hurt on each and every clamp between the fuel pump and the gas inlet on the fuel tank, including all crossover tube joins.
3--I drained the tanks and installed fresh fuel along with 4 oz of Marvel Mystery Oil in the tanks to clean out anything that may need cleaning out from tanks to carbs.
4--I removed and inspected the central crossover tube, found no sign of a blockage and reinstalled it. I reamed out the outlet to fuel line "piplet" with a wire brush just to be sure.
I DID notice that much of the red liner has vanished from the crossover tubes making me wonder if it vanished from the fuel tanks as well........
5--I don't see any more fuel pump bubbles but do see excitement in the fuel filter - maybe that is due to its elongated shape as the pump pulses it looks bubbly but really isn't ??
6--the piece of crap inline fuel pressure gauge is not working and will be returned.
There must be one that works on the market somewhere.
7--I inspected each inch of the fuel line for wet spots or holes but could find neither from carbs to crossover pipe.
8--the engine now idles but won't run unattended for too long so the carbs may need a tweek to mate to this engine...
If I add a little choke it helps.
Lastly...
I'd like to add a note on how the two fuel leaks discovered recently came to be...
A while back, I had a problem (that was of my doing) with the seal around the fuel tank sender device.
If I filled up with fuel, it would run out the top of that tank.
I got tired of not being able to fix that leak and left the car with a nearby shop to fix.
They pulled that tank and somehow got the seal to work right and reinstalled that tank.
While they were at it, they did not get the crossover pipe "joins" right and the one on that side leaked so I returned and had them fix that.
Unknown to me, when they slid the crossover pipe to the right to free up the left gas tank, they got the crossover pipe join poorly aligned on the right side..
It was way over to one side, barely fitting at all, but not noticeable to the eye - until I yanked the crossover pipe last night and found the leak.
Also the shop said the stub of metal fuel line to the fuel pump inlet was twisted a little bit (as I knew and ignored) and that they had 'straightened it some."
Where they twisted that pipe a pinhole leak developed.
Allan