Rough Running w/ Dual Carbs, And now low fuel pressure too. Options

[Craigers17]

So I've been trying to track down a rough running issue with my 2056 w/ dual 40IDF's. It has not been running well for several months, and has had spells of sitting for a while. When these issues started, probably 9 months ago now, I changed out the old fuel filter and relocated the pump and filter to the front and upgraded both to the type that Tangerine sells. I also took that opportunity to install a stainless steel line and all new rubber lines. (the problem existed BEFORE I did all of this)

Recently, in the last week or so, I replaced both manifold and carb gaskets. I haven't actually opened up the carbs yet, but have cleaned all the jets. After this work, I had it running great for about a quarter mile, and then started backfiring and bogging down. I have a fuel gauge and also noticed that it is now only reading about 1.25 to 1.5. It normallly sits around 3 consistently. I suspected maybe I had a fuel line that was kinked under the tank, so I pulled it and they are fine with no leaks.

I am thinking that the fuel filter may be clogged after having sat dormant for so long, OR, I might have some clogging going on in either my fuel "T" splitting the carbs or in the "T" that contains the gauge. My only other guess is that something is going on with the floats. I know this post is a lot, but if anyone has any ideas, please feel free to chime in. Thanks!

[technicalninja]

You did have some nastiness.

Looks like a goober in the top of the chamber in the first picture.

Some crustiness on the main well tubes in another.

I'd have put a few ounces of fuel in the bowls to test/flush out the accelerator pump circuits.

The carb bodies look NICE, however.

They needed to be "poor boy" rebuilt now.

Is the picture of the floats with your new adjustment?

Something I've noticed over the years is when the floats are right the parallel lines/surfaces are also parallel to the top plate. This is on almost everything, not just Webers.

It looks like the outer float is a little bit bent downwards (high level) but picture angle may be playing a part.

If "12" is pictured, then 6-8 would have been a significantly higher fuel level in the bowl.
Tuning/jets might change
Did it run rich?
Too high a fuel level in the bowl tends to make things rich.

Get an 8oz container with a squirt top and dump 2 oz of fuel into each carb through the bowl vent. It should run then.

I'd run a bunch of fuel through the pump/lines looking for trash in it.