just found a new size bottle for GM top engine clean.
12346535
it is .8 oz
$4
just enough to mix with 20oz of gas and run through the fuel rail for cleaning.
not enough for you guys wanting to pour through the carb though. (#1050002 for old 15oz bottle)

Just like to add something on GM top end cleaner. That stuff is fantastic for cleaning gum off of things like TBs, carb jets/needles etc. We use it on our motorcycles too. The thing is, you have to put the parts in a metal laddle or pot, put the top end stuff in and then using a propane torch heat it to a boil. I strongly recommend doing it outside as it sticks and tends to catch fire too. Oh yeah, have something ready to cover the pot and put the flames if does catch fire. It sounds hairy bit it's really is no big deal. As it starts to boil you'll see the grum/and/or whatever just sperate from the parts and float away! When you take the items out, they will look better than new, brass looks like gold. And don't throw the top end stuff away, you can use it again.

Actually you could mix it and use it with a gravity feeder to supply a carb. Carbs don't need allot of pressure. Hanging a bottle of the stuff mixed from an open hood is usually enough to keep the fuel bowl filled on an idling engine, even if you blip the throttle a couple times to get it to secondary jets etc.

The hard part on some carbed cars is figuring out how to disable the fuel pump in a way it won't get damaged. Electric ones are easy but some mecahicals don't like being run dry very long. It sounds stupid but plugging the line from to the carb from a mecahical pump is often the best way... The pump is built to expect this line to be blocked when the needle in the carb closes.

If you realy do need pressure for a carb... you can always use the EFI cleaning tank and pump it up with a hand pump so you can keep the pressure low. Most carbs don't want to see more than 4-9 PSI.

I can't recomend that heating idea but using something that isn't an open flame would probably make it safer. I'd definitely agree you want to do it outside and way far from anything that would catch fire. Besides that it stinks god knows what chemicals you'd be breathing. Whatever is actually in the stuff isn't the only problem. Allot of things change, often to really ugly compounds, when heated.

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