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]

He "deadend" it so he could check PSI. I think that was temporary.

OP needs the PMO pressure regulator. Many out there. Can get it with AN or hose barb.

It's really a bypass.

So FP--------> Fuel Filter --------> PMO regulator set to 3.5 PSI ---------> dual outlets to small inline filters ------_> each carb.


PMO regulator ------> return line.

Optional: Carb crossover line to equalize fp. (I don't run one but I've heard it can be helpful for overall performance.

[Cfletch]

He "deadend" it so he could check PSI. I think that was temporary.

OP needs the PMO pressure regulator. Many out there. Can get it with AN or hose barb.

It's really a bypass.

So FP--------> Fuel Filter --------> PMO regulator set to 3.5 PSI ---------> dual outlets to small inline filters ------_> each carb.


PMO regulator ------> return line.

Optional: Carb crossover line to equalize fp. (I don't run one but I've heard it can be helpful for overall performance.

Right, did that to check ma PSI if valves were shut, wanted to check and see how strong the pump would be. Anyway, yes today I plan to do: FP---Filter--regulator-- stock 6 hard line--- carbs. Im not doing a return line back to tank, blocked that off at the tank with a hose bolt combo.

I am using the return line as my feed because the return line diameter matches everything else and didn't want to mess around with going up and down sizes. I have a regulator mounted kind of near where the stock 914 4 fuel pump was, and then its going up through the metal to the stock 6 hard line which does the branch to both carbs. Because of that, no PMO regulator.