Looks like you are missing the back squirter?


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I have a demon 850 vac secondary carb. I did a quick rebuild on it. New gaskets, needle/seats, etc. I put it back on the boat and its blowing out tons of black smoke (unburnt fuel). I noticed its now dumping a ton of fuel during idle where it wasn't before. Float levels are fine and jet sizes weren't changed. Idle set screws are 1.5 turns out on all 4 corners.

What did I screw up?

It was a specific kit to this carb I got from summit. It's pouring from (sorry for my lack of technical terms) out of the round ring in the center on the primary side only. The floats have clear sight windows and they are just at the bottom of them. Adjusted only by using those sight windows while running.

Here is the kit I used:
http://m.summitracing.com/parts/DEM-190003

Yup. Sure as shit was the wrong metering block gasket. I had this black one in there. Swapped it for the blue and it worked. Only difference between the two was the blue didn't have the hole just under that square vent hole and had a hole rather than the arch over the power valve cutout.

A side issue I've seen twice now with this carb is I get the brass needle clogged and stuck that's under the squirter. It takes a lot to get it free and its caked with white corrosion. I do have a issue getting water in one tank, so that might be the corrosion issue.

Damn fill cap gaskets are leaking water - I think that's my source of water in this one tank. Any idea where I can replace the rubber in them? Looks like they are just O-rings. Rex even still make these?