Many of us share the common demon that is filling up the gas tank in the Vespa GTS 300. I can only assume the 250s were similar, if so, the problem is widespread!
Yet, thanks to this community, the answer is upon us.
In the wiki section is a post about it. With a video no less (what does it say about us that we need a video to demo this process...).
Thus in the truest testament to taking others' advice, it was with trepidation that I ignored the flashing yellow warning light when it first came on this morning, telling me I was low on fuel. I think we can all agree the gauge is lying at the best of times, so the light is your, umm...light? No...BEACON! Yeah, that's better!
The low fuel light is your beacon!
Let's clarify one thing, however: the light, when it first flickers, can come and go a bit while the fuel level moves around a bit. If your light is flicking between on and off (not back and forth, but randomly), you're merely "almost low" on fuel, but heed the warning. Word is we've only got about 20 miles on riserva.
I was 6 miles into a hard low fuel light as I rolled into the Chevron - not my usual one with the fancy new nozzles, but a close to similar setup at the pumps.
Went all James Bond on the per carrier with the Q-branch move (prop the carrier up with the fuel cap at the rear).
Grabbed the nozzle, inserted said nozzle into the gas tank and put it all the way in, with the handle essentially "pointing" up the centerline of the scoot, facing the handlebars.
1.3 gallons went in and it clicked off. I took a peek inside and could see there was still room for more benzene, so GENTLY, I trickled the nozzola to get me up to 1.5 gallons. I knew I was close and at 1.6 I saw a minute splash of fuel that didn't so much as wet the capture area around the filler neck on the bike.
Given I was as close to topped up as I cared to push it, I suspect our riserva has more than 20 miles of range, but...we can all test that theory some other time.