Weber idf 44 leak!, Help! Options

[jmill]

What I'm now wondering is: if the lowest progression hole is open and exposed below the throttle plate, would fuel leak out (with engine off) because the throttle plate isn't covering it?

No. Look at the picture of the idle circuit I provided above. Fuel and air are drawn into the circuit by vacuum. With the engine off you have no vacuum. If the air jet is clear it will break the siphon and the fuel flow stops.

But like George said, you have another issue if your butterflies don't close all the way.

[rhodyguy]

yep. the 4 progression holes are effectively blocked/out of the vacuum (should be) when the plates are completely closed. the bevel of the plates must be in the correct orientation or they are held open slightly.

[Milkman7286]

Either way I'll look at the throttle plate and readjust if needed.

Can anyone comment on my earlier discovery about the throttle plate stopping the gurgling noises when forced closed a little further? Why would that cause it to stop?
(I'm assuming the gurgling noises and leaking are one in the same and when one stops the other will)

[stugray]

Can anyone comment on my earlier discovery about the throttle plate stopping the gurgling noises when forced closed a little further? Why would that cause it to stop?

I am not as familiar with the 44 options.
Do you have the adjustable accelerator pump linkage?
If so, it would be easy to disconnect it to take it out of the equation.
And if you DO have the adjustable version, is it adjusted way too "tight"/far in?

Other than actually opening the butterflies, that is the only thing hooked to the shaft that affects the carb operation.

ANd if you took the any of the butterflies out, it is possible you bent the shaft.
And when you reinstall the butterflies, it takes quite some time to get it realigned.
I had to let mine "slap" shut a number of times to get them to seat properly before tightening the screws.

[jmill]

Again, with the engine off, no fuel should leak out of the progression holes no matter where the butterfly is. There's no vacuum to draw fuel and air through the idle circuit. That's if the idle air jet isn't blocked creating a siphon and your casting isn't cracked/porous.

Did you verify that the idle air jet was clear?

If your positive that your problem is a leaking idle circuit, I can't explain why the gurgling stops when closed. Unless, the "gurgling" your hearing is fuel running down the intake manifold and sizzling in the hot head.

Just send them to George. He can go through them, check for problems and even rebuild them for you.

[Milkman7286]

Again, with the engine off, no fuel should leak out of the progression holes no matter where the butterfly is. There's no vacuum to draw fuel and air through the idle circuit. That's if the idle air jet isn't blocked creating a siphon and your casting isn't cracked/porous.

Did you verify that the idle air jet was clear?

If your positive that your problem is a leaking idle circuit, I can't explain why the gurgling stops when closed. Unless, the "gurgling" your hearing is fuel running down the intake manifold and sizzling in the hot head.

Just send them to George. He can go through them, check for problems and even rebuild them for you.

Well I didn't get a chance to work on it yesterday but I have spent hours mulling this over while in the office at the day job.
It absolutely will not gurgle with the top of the float bowl off (gasket and metal float bowl cover that float and needle and seat attach to).
I have placed the gasket over the bowl and there is no blockage of air bleeds or anything like that. The gasket would have to shift a few mm in order for that to happen and that is certainly possible but I have looked into that and determined it isn't happening. Also since I have tried two different gaskets...

So the next piece above the idle air bleed would be the metal float cover that screws down with the 5 flathead screws. If there was a casting flaw or something on this piece that could cause an obstruction I wouldn't have caught it yet so it is probably worth a glance.

I have another trick up my sleeve that I will try tonight and report back.