IDA3C Weber Troubleshooting Options

[Cfletch]

Hey there everyone, working on getting my 6 conversion going here and I was able to hook up a temp fuel system in place of my tank while I am waiting on a few parts. I wanted to get the car to idle with its new fuel pump (not yet regulated down to 3.5psi) rated at 5 PSI max. I wanted to get the carb bodies full of fuel and get some pressure into the system and as soon as the pump turned on with the ignition the carbs essentially started dumping fuel down my intakes. Almost as if there was an internal leak causing fuel to just enter their respective cylinders. I'm new to down draft webers so this confuses me. I popped the top off of one of the carbs and noticed the fuel level was extremely low in the bowls so it was not like the needle and seat were stuck or a float was stuck causing it to overfill. Kind of stumped here as these carbs are rebuilt. Really any suggestions are good here. the float level was set, the needle and seats are good and not sticking at all.

I read somewhere but not in much detail that the bowls are vented? I have these little plunger-esq things in each vent tube that I have not yet pulled out. Would that be the source of my problem? If the bowls couldn't vent its just pressurizing the changes and causing the fuel to just leak down into the engine?

[brant]

You should check and reset your float levels

Most likely reason

And they change. Even just from use or possibly sitting

You’ll need a float gauge to do this
And the different thickness of special washers they sell for this purpose
I like to use two of the float gauges at the same time, one per a bank

Floats are checked while the motor is running with this special tool

3 barrel webers are the most complicated and sensitive carbs I’ve ever had personal experience learning

You need to read the hundred pages of Paul abbot set up articles any time you have the carbs off. Lots and lots of tuning and linkage that needs to be done in correct sequence
There is an art to these carbs. Might be worth paying a guru for this job. It can take a lot of time as a beginner to learn this skill and still not come out as well as a guru can perform


And if previous rebuild time was very long.
Worth considering another rebuild, fresh gaskets all around if you don’t know the age of that last rebuild and gaskets