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@dibiasio avatar
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2006 LX150
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Forgive me if the answer to this is common knowledge or has been posted before but lately my LX150 (not fuel-injected) has been stalling out when my gas gauge dips below 1/4 tank. I had to push it a mile and a 1/2 to a gas station last week - filled it and it ran fine. A month ago I could ride until the warning light was on steadily but now it seems to peter out on me with seemingly plenty of gas in reserve. Hoping that someone with more experience will know why this could be happening.

Thanks in advance to the MV braintrust.
@znomit avatar
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Veni, Vidi, Posti
LX190 Friday afternoon special, Primavera, S50, too many pushbikes
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How much gas did you fill with?
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znomit wrote:
How much gas did you fill with?
A little more than 3/4 of a tank.
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Veni, Vidi, Posti
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znomit wrote:
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Dude: in this context what does that mean? I filled it to roughly 7/8 of a tank.
@berto avatar
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Molto Verboso
2006 LX150 (carbed) | 2007 GT200
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@berto avatar
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I think znomit's asking how many litres of fuel you had to add to fill up. Maybe your gauge isn't working and you just ran out of gas?

Is the evap system still in place? Maybe that's malfunctioning and the tank is getting vacuum locked When it stalls, can you hear a rush of air into the tank if you remove the cap?

Does the bike run better if you disconnect the evap hose at the carb?
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berto wrote:
I think znomit's asking how many litres of fuel you had to add to fill up. Maybe your gauge isn't working and you just ran out of gas?

Is the evap system still in place? Maybe that's malfunctioning and the tank is getting vacuum locked When it stalls, can you hear a rush of air into the tank if you remove the cap?

Does the bike run better if you disconnect the evap hose at the carb?
I added $4 worth @ 4.29 a gallon to get the gauge to go from 1/4 to about 7/8. I know the tank holds more than 2 gallons. (I'll accept all the facepalm emojis it takes to get me some honest advice on the matter.) The situation I described happened once when I was on E, but in the past I could go well past that and ride until the warning light was blinking. Then I'd fill up when it was solidly on. Then yesterday it started bogging down when the meter read 1/4.

I've never had that air suction upon cap removal. I know what you mean but that hasn't happened. I haven't run it with the evap hose disconnected - but I can try that in the name of troubleshooting. Since no suction dynamic when gascap is removed it seems like maybe that's not the thing...

Sincere gratitude to znomit and berto for trying to work with me here.
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You need to fill to the brim to see if it's just a fuel gauge issue or something else.
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znomit wrote:
You need to fill to the brim to see if it's just a fuel gauge issue or something else.
OK thanks - I'll report back afterwards.

I appreciate your input brother.
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Molto Verboso
2006 LX150 (carbed) | 2007 GT200
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UTC quote
What about a kinked fuel line? Or a dodgy petcock?

The LX doesn't have a fuel pump. So I'm thinking lower fuel height in tank = lower fuel pressure = can't get through an imperfect flow path.
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berto wrote:
What about a kinked fuel line? Or a dodgy petcock?

The LX doesn't have a fuel pump. So I'm thinking lower fuel height in tank = lower fuel pressure = can't get through an imperfect flow path.
Maybe any of those things but I kinda hope it's a petcock issue so I can have a reason to say that word a lot.

I should mention: this thing just had a full going over less than 2,000 miles ago.
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UTC quote
znomit wrote:
You need to fill to the brim to see if it's just a fuel gauge issue or something else.
So I filled it to the brim, meniscus and everything. Gague fell slightly short of F - looked like 7/8ths. But even if there is a discrepancy with the reading now? It'd be a recent development. I used to run it down til the light came on. What could cause a change like that?
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A fuel sending unit going out or (less likely) a gauge starting to go. Possibly wiring/connection.

My money is on the sending unit.
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greasy125 wrote:
A fuel sending unit going out or (less likely) a gauge starting to go. Possibly wiring/connection.

My money is on the sending unit.
How major an ordeal is that Greasy?
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I just checked: the last major service Salvatore had was only 1,200 miles ago.
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UTC quote
DiBiasio wrote:
I just checked: the last major service Salvatore had was only 1,200 miles ago.
I've found that with older bikes like this (I have an '06 LX too), the maintenance problem isn't really the usual mileage items. It's more that the non-standard items, like hoses and vacuum petcocks, start to age out and cause grief.
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UTC quote
Wiring to the choke was janky and cracked fuel line - according to the dealership. All good now. Thanks for listening to my newbie whinging.
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UTC quote
I had this problem on the S50 and now the sprint. Both were driven by my house mate and she would tighten the cap so tight that it was hard to setoff. This caused a vacuum issue. When it would happen I would take it for a ride see the fuel was low and it was sputtering. I'd get gas put the cap on just snugging it up. It would run with no problem. She would get gas and back it came. Now when she fuels it she just snugs it and no problems.

This might be your problem and it might not but it is easy to try.
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berto wrote:
The LX doesn't have a fuel pump.
Ah…some carbed LX models (and all fuel-injected LX models) do indeed have fuel pumps. My carbed 09 S, which is mechanically and in the eyes of the DMV an LX, makes a ticking sound for a few seconds when the ignition key is turned on. That is the fuel pump coming to life.
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Pinkscooter wrote:
I had this problem on the S50 and now the sprint. Both were driven by my house mate and she would tighten the cap so tight that it was hard to setoff. This caused a vacuum issue. When it would happen I would take it for a ride see the fuel was low and it was sputtering. I'd get gas put the cap on just snugging it up. It would run with no problem. She would get gas and back it came. Now when she fuels it she just snugs it and no problems.

This might be your problem and it might not but it is easy to try.
You let someone else use your Vespa? I wanna talk about that for a minute.
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I had a motorcycle that stopped running because of a dirty fuel filter when the tank got low.
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