Fri Jun 10, 2022 10:21 am

Lurker
Vespa px 125 2003
Joined: 10 Jun 2022
Posts: 1
Location: London
 
Lurker
Vespa px 125 2003
Joined: 10 Jun 2022
Posts: 1
Location: London
Fri Jun 10, 2022 10:21 am linkquote
Hi All, I'm a new Vespa owner and have just bought a 2003 PX 125. All was going well, until halfway through my second journey and she ground to a halt, would not start, and I then noticed a large amount of liquid pouring out from the bottom of the scooter (not sure if petrol, oil etc). Happy to share a photo if possible and if this helps. Any ideas?!
Fri Jun 10, 2022 10:26 am

Veni, Vidi, Posti
GTS 300ABS, Buddy 125, Buddy Kick 125
Joined: 29 Dec 2007
Posts: 12663
Location: Oregon City, OR
 
Veni, Vidi, Posti
GTS 300ABS, Buddy 125, Buddy Kick 125
Joined: 29 Dec 2007
Posts: 12663
Location: Oregon City, OR
Fri Jun 10, 2022 10:26 am linkquote
You are having trouble telling petrol from lubricating oil?? Have someone else help you with that determination, if needed, and then identify the source of the leak. From there I'd advise you to seek help on the Not-So-Modern forum as that is where you will find P/PX owners.
Fri Jun 10, 2022 11:15 am

Style Maven
'74 50s x3 '78 P200 E '84 Cosa '91 PK50XL2 '58 AllState '68 Sprint '80 50special and a '66(?) Super125
Joined: 22 Nov 2010
Posts: 8603
Location: seattle/athens
 
Style Maven
'74 50s x3 '78 P200 E '84 Cosa '91 PK50XL2 '58 AllState '68 Sprint '80 50special and a '66(?) Super125
Joined: 22 Nov 2010
Posts: 8603
Location: seattle/athens
Fri Jun 10, 2022 11:15 am linkquote
If something is pouring out, get some on your fingers and smell it. You should know if it's gas, or if it feels slippery it's likely oil. I think you'd have autolube and have no 'premix' in your tank. But yes, some pics of where it's coming from will help figure it out.

Next thing I'd wanna do is quickly check for spark just in case, before chasing fuel issues. Pull the plug, make sure it's healthy or use a new one, hook it up, lay it someplace it will be grounded, turn on ignition and kick it over. You should see a nice blue spark.
Fri Jun 10, 2022 3:06 pm

Ossessionato
'70 Super 150, Aprilia SR MT 125, Moto Guzzi Bellagio
Joined: 22 Nov 2011
Posts: 2334
Location: Sydney, Australia
 
Ossessionato
'70 Super 150, Aprilia SR MT 125, Moto Guzzi Bellagio
Joined: 22 Nov 2011
Posts: 2334
Location: Sydney, Australia
Fri Jun 10, 2022 3:06 pm linkquote
Probably not a good idea to check for spark if it's leaking fuel all over the place. Can you smell petrol? Most likely cause is a cracked/snapped fuel line. They get brittle and fall apart. As others have said, if you can't tell petrol from oil, best to get it to a mechanic.
Sat Jun 11, 2022 1:30 am

Hooked
Joined: 28 May 2020
Posts: 449
Location: Planet Earth
 
Hooked
Joined: 28 May 2020
Posts: 449
Location: Planet Earth
Sat Jun 11, 2022 1:30 am linkquote
As said before very common for line just to rupture . Get ethanol resistant fuel line and more than likely get somebody to do for you as the lengths and positioning are crucial as it's gravity fed. They tend to rupture near the carb box due to heat produced by the cylinder making them brittle. If it's 2003 px and not had a line change it will be as brittle as anything . Fuel absolutely stinks , 2 stroke oil doesn't turn the fuel tap off , whilst sitting in it lever goes to your left. Pop the engine side panel off. Remove the air intake banjo, corrugated black rubber tube. Look at the petrol line coming in from frame , suspect your leak somewhere around that point. If you feel confident remove the retaining clip where tube enters carb. Undo the petrol tank bolts. If there's a lot of fuel in tank get somebody to support tank and lift up. Place something like a doubled up tea towel on each side of frame. Reach down and pull out fuel tap retaining clip. Swivel the tank sideways and rest on the towels on frame so not to scratch paint. Take a photo of the exact positioning of the fuel line, there's a metal bracket on the tank where the line will rest. Disconnect fuel line and pull out. Measure the length, width of tube and the inner width of fuel hole feed. Order one of these online and get ethanol resistant one. With new pipe , feed in from the frame hole near carb first. Place your fuel retaining clip back on the fuel line near carb and attach to carb intake. Pull the fuel line up from the frame where tank goes and make sure the line is taught near carb end. Place your fuel retaining clip for the tank on the line and reattach but refer to the positioning you took earlier with your phone . Lower the tank into frame with somebody helping to support and reattach fuel lever, make sure the rubber grommet is on the lever , thus pops into frame on the exterior of frame. Do your tank bolts up. Put the carb air box banjo back on. Turn your fuel back on and give it a go. If the scoot then plays up when your fuel gets low In tank then you likely got a kink and you need to go back and check by removing fuel tank again. It's a simple job once you done it but can be frustrating. Does help having a low tank as low weight makes it easier or another pair of hands .
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