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?

[Graydingo]

Sounds like you are making progress.

Popping out the exhaust is rich. Reduce the idle by 1/4 turn. You can search best lean procedure and that should be your starting point. In a nutshell you run them in until it sputters then 1/4 turn out or maybe 1/8th turn. it doesn't take much. Some of the idle mixture screws on emissions carbs were stepped. Pull one out and verify it's tapered.

You can pick up a cheap laser temp gun. I use one to shine it on the exhaust header coming right out of the cylinder to verify that cylinder is firing.

If one is cold, but you have it set up correctly, it could be plugged in one of the hidden passageways. Even so called rebuild carbs dont always have the hidden passages cleared.

[Cfletch]

Sounds like you are making progress.

Popping out the exhaust is rich. Reduce the idle by 1/4 turn. You can search best lean procedure and that should be your starting point. In a nutshell you run them in until it sputters then 1/4 turn out or maybe 1/8th turn. it doesn't take much. Some of the idle mixture screws on emissions carbs were stepped. Pull one out and verify it's tapered.

You can pick up a cheap laser temp gun. I use one to shine it on the exhaust header coming right out of the cylinder to verify that cylinder is firing.

If one is cold, but you have it set up correctly, it could be plugged in one of the hidden passageways. Even so called rebuild carbs dont always have the hidden passages cleared.

Yup used one of those laser temp readers and saw a noticable difference in temps. 1 and 2 seemed to be lower than all others. I'm going to get new plug wires as mine as suspect to begin with and then ensure I have correct float level as well as pressure and use that as my starting point. My adjustments didn't see to matter much when I was running the engine so I'll do the above and get to a standard baseline per your lean suggestion and go from these in the coming days. Also need a muffler since tuning while its just headers kind of sucks