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No obvious fuel lines were disconnected (although I did replace 2 that were getting old) and I pulled the carburetor out, but nothing looked obviously amiss.

Any ideas?
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Carb float stuck open? *AND* vacuum tap line also stuck open somehow...?
To have that happen your muffler must be full of fuel....

Park it outside. What The? emoticon
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I checked the float and it looked good to me. Smooth action and no obvious damage. But I'm not really used to working on scooters, so it's possible I'm stupid.

Watched this video and my float seemed to be doing what this one is doing:
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Please
Hate to belabor the obvious, but you're sure it was gas and not water?

And is this an ongoing thing?

Possible bypassing gas filled the cylinder, and then cranking it over pushed it out the exhaust.

Definitely want to change the oil soonest.

Usually can tell if the float is working by attaching a short tube to the fuel inlet of the carb, with the float bowl off. Blow through the tube, push the float up, it should block flow.

Not common, but floats do occasionally spring a leak, fill with fuel and fail to float.

Or could put a sparkplug in the exhaust, and have a flamethrowing exhaust. Probably kinda kill your mileage, though.
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Re: Piaggio LT150, spurting gasoline out of the exhaust!
MrDarkHorse wrote:
Crying or Very sad emoticon Crying or Very sad emoticon

No obvious fuel lines were disconnected (although I did replace 2 that were getting old) and I pulled the carburetor out, but nothing looked obviously amiss.

Any ideas?
I think the answer lies within the question here..

Check your work again... Something didn't went back the right way...

You may need to dry the spark plug as well...
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Re: Please
Jimding wrote:
Hate to belabor the obvious, but you're sure it was gas and not water?

Hate to belabor the obvious, but, where would water come from?
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Definitely gas, not water.

I just changed the oil a couple months ago, so I think that's good.


I'm gonna pull the carburetor again and try some of the steps you mentioned with the float.
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MrDarkHorse wrote:
Definitely gas, not water.

I just changed the oil a couple months ago, so I think that's good.


I'm gonna pull the carburetor again and try some of the steps you mentioned with the float.
No, your oil is most definitely not good.
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that is alot of gas. something is AFU, I have never ever seen an exhaust with gas like that in over 50 years of being around m/c's and scooters. did someone play a prank on you?
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Okay I pulled the carburetor again.

Here are some relevant videos and pictures.

I pulled the jet screws and cleaned them with a guitar string, but they really didn't seem to need it.

Am I missing something here? It seems pretty clean to me
Forum member supplied image with no explanatory text
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⚠️ Last edited by MrDarkHorse on UTC; edited 1 time
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The float
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Oh and to answer a previous question. I had ridden the scooter for a couple of hours just last Saturday, no work has been done on it since, when I went to start it yesterday this happened. So it's not that I put things together incorrectly. Something seems to have failed internally.
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Re: Please
Jimding wrote:
Usually can tell if the float is working by attaching a short tube to the fuel inlet of the carb, with the float bowl off. Blow through the tube, push the float up, it should block flow.

Tried this and the float does block the flow when it's engaged.
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The odds are that the fuel valve does not shut off when the engine does. Pull the gas line off the carb and see if gas continues spewing out of the hose. If it does, there's your main issue. Float needles will sometimes leak a little, but if the fuel valve shuts off, there's nothing to leak into the engine.
Two things to concern yourself with while the bike does this, it is likely filling the cylinder with gas too, and if you try to start it with the cylinder full of liquid (hydrolock), you run a very real risk of either bending the connecting rod or burning up a starter motor.
I know it's a very effective way to ruin your day, but take the spark plug out of the engine after it's been sitting overnight, and see if gas comes out or the plug is wet.
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Re: Please
MrDarkHorse wrote:
Jimding wrote:
Usually can tell if the float is working by attaching a short tube to the fuel inlet of the carb, with the float bowl off. Blow through the tube, push the float up, it should block flow.

Tried this and the float does block the flow when it's engaged.
This test doesn't address this issue.
Jimding wrote:
Not common, but floats do occasionally spring a leak, fill with fuel and fail to float.
I don't know about your fuel tap/lines but I do know how to check a float. Put the float in a container of gas overnight. If it looks like it's not floating correctly, bad float.
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old as dirt wrote:
that is alot of gas. something is AFU, I have never ever seen an exhaust with gas like that in over 50 years of being around m/c's and scooters. did someone play a prank on you?
I was going to say the same thing ...
Also because the excessive quantity of ejected liquid is incompatible in operation with fully open gas, too much comes out and it would not start at all.
I said liquid because if the vehicle has a damaged lubrication pump there could also be an excessive supply, in this case check the oil level.
Furthermore, the oxidation of the jets makes me think of a vehicle that has stopped for a long time ...
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If
If the gas got to the muffler through the cylinder, then some of that gas almost certainly got into the crankcase, contaminating the oil.

I dunno where the water came from. Washed the bike? Someone's prank? Accumulated moisture from combustion? Point is, if it's water and not gas, then not a carb problem. Sometimes worth checking the details so as to close off lines of inquiry.

Beware of cranking the bike over with the sparkplug out to clear gas from the cylinder. Best done by hand, with the ignition off. Know a person who had that problem on a boat engine. Pulled the plug, put it into the sparkplug wire for safekeeping, laid it on the head. Cranked it over, the cylinder sent a plume of gas out the sparkplug hole, where the plug just happened to spark at the right time and ignite it. I hear it got pretty exciting for a while.

Generally if a float needle will block air, it will block gas. If you want to be certain, hold the float bowl on the bottom of the carb (without screws) with the carb vertical, feed it gas until the float shuts off, carefully remove the float bowl to check the gas level (after shutting off the gas supply, of course). If the float needle seat is removable, be sure it is gas tight as well, to prevent bypassing the needle.
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For whatever it's worth, as a followup...

I ended up cleaning the carburetor real well, changing out the spark plug and fuel petcock (just in case), plus a couple of fuel lines that were pretty ratty. Also changed the oil again and had to flush the muffler out cause it was still full of gasoline.

After putting all that back together it seems to be running really well, and so far I haven't had any recurrance of the crazy gasoline in the tailpipe thing.
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Bah, just went to check on it and it seems like I have a small oil and/or gas leak coming down the kickstand. Got a couple of little spots where it touches the ground.
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