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Post by lostforawhile on Aug 9, 2017 21:15:26 GMT -5
it may have a facet brand fuel pump inside the tank. the pressure would be regulated at the pump, inside the tank, excess fuel would simply flow from the pump back into the tank
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Post by lostforawhile on Aug 9, 2017 23:03:09 GMT -5
it most likely looks like this if the tank is in the floorboard. it either has an external pressure regulator, or the regulator works by venting excess pressure out a spring loaded valve on the pump, right back into the tank, these small carbs will only handle about 2 psi at the most before the needle valve is forced open. so it doesn't take much, the fact that two of them flood, is telling me you have a pressure issue , these types of pumps are really common on a lot of lawn equipment, generators, and other power equipment, including some scooters , this one is from a Kymeco
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Post by catchacuda on Aug 9, 2017 23:30:39 GMT -5
Hope the issue is resolved! Had a GY6 150 carb apart last week. If your stripped screw is accessible with vice grips go for it! I had to do this to avoid stripping a very tight fastener on the float bowl. Just clamp it down really tight and it should break free with little effort. ...Should you need that carb in the future
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Post by bluegoatwoods on Aug 20, 2017 8:43:16 GMT -5
Neat info, fellows!
I hadn't occurred to me, lostforawhile, that there might be an actual fuel pump inside that tank,though modern automobiles should have been a good hint. But that makes excellent sense. I'd been walking around thinking about that little puck-shaped fuel valve and wondering if vacuum pressure from the engine could possibly be enough to draw fuel up that high. It seemed doubtful. Now things are much more clear.
And I like your (1970? 71?) Barracuda, catchacuda. I'm one of those who have a soft spot in my heart for Chryslers of the 60s and 70s. They weren't perfect and they could often be odd. But they always seemed to me to be the best of the big three in terms of just going and going and going. I was fond of saying that I figured I could fill the tanks of the ones I had with coal dust and they'd still get me around. I never tried it, but I might have been right.
Anyway.....as far as my scooter is concerned. I still haven't yet opened up the extra carburetors I have on hand.Between my job and work needed on my home, this job just can't be a high priority. But I might not need to do it anyway. After bending the needle valve hanger in order to jam that valve up in there better, I no longer seem to have any flooding issue.
It's been a couple of weeks since I did that. And I've commuted to work everyday since with no issues at all.
So I feel pretty certain that fuel pressure forcing open that needle valve was the trouble and that it's now okay. And if that trouble comes back I'll know what to look for.
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