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!

[Osnabruck914]

As far as fuel pressure goes, I do remember that when I had a fuel pressure gauge installed in the engine compartment it was only accurate when the engine was cold just after startup. As soon as things got hot in the compartment it always read low. I would get 3 lbs cold and about 1-1/2 when hot. I'm sure I getting was a false reading from the hot gauge.

Are you confident your carbs are truly balanced?

Osnabruck914

[Craigers17]

As far as fuel pressure goes, I do remember that when I had a fuel pressure gauge installed in the engine compartment it was only accurate when the engine was cold just after startup. As soon as things got hot in the compartment it always read low. I would get 3 lbs cold and about 1-1/2 when hot. I'm sure I getting was a false reading from the hot gauge.

Are you confident your carbs are truly balanced?

Osnabruck914

Good point. You just made me remember that my gauge actually has a release valve to equalize to atmospheric pressure after it heats up. Tomorrow I will try the release and see if that changes the reading....could be a false reading.

The carbs are definitely balanced at idle. All 4 at about 5.5-6. The throats on the passenger side are a little higher than the driver’s side when the rpm’s go up.