My 250 has a 2" lip inside the tank to prevent one from completly filling (but 
i rock the bike when i fill it to get the air out of that void and more fuel 
in) i  believe that is suposed to stop the fuel leaking out the cap issue.... 
Although when it got blown down by the wind i did see gas leaking out
-----Original Message-----
Date: Tuesday, April 13, 2010 9:54:59 am
To: [email protected]
From: "Javier Garcia" <[email protected]>
Subject: Re: [Nighthawk Lovers] Re: 83 550 Gas Cap Seal Question

I think the tank cap should be sealed enough to prevent that. I do not have
a center stand, but when I fill out my '96 750 I always make sure it is in a
complete vertical position. I actually never get out of the bike to fill up.
I have never had this problem, and I can remember at least a couple of times
when I stop, fill up the tank, put the bike on the side stand and when the
bathroom, grab a soda, etc. Sunny or not, the gas is always on my tank.

Javier.

On Tue, Apr 13, 2010 at 9:13 AM, Dale <[email protected]> wrote:

> I've heard the term vapor lock used specifically when talking about
> airplanes or cars that are fuel injected.  The term is related to gas
> that is in a fuel line that evaporates creating a bubble that can not
> be pushed through the line.  The solution is indeed to get the fuel
> back below its vapor pressure (it condenses and the bubble goes away)
> and the fuel will flow normally again.  I have not hard it in
> reference to the level of fuel in a tank, although on a motorcycle
> your fuel pressue depends on how high the fuel is above the carburator
> so I'm not positive.  Different fuels may have a slightly different
> vapor pressure depending on additives, thus thebetter experience with
> Shell fuel...
>
> "E"
>
> On Apr 13, 4:38 pm, Don Simpson <[email protected]> wrote:
> > Years ago I had a similar problem with my V45 Sabre, After riding 30-40
> miles on a hot day the bike wouldn't start. My mechanic diagnosed it as
> "vapor lock". After waiting 30 minutes it was fine.  Said the remedy was to
> fill tank only 2/3 full.  I also noticed I rarely had the problem when I
> used Shell fuel.....
> >
> > DON SIMPSON
> > 93' 750 NIGHTHAWK
> > West Central IN
> >
> >
> >
> >
> >
> > > Date: Mon, 12 Apr 2010 14:32:08 -0700
> > > Subject: [Nighthawk Lovers] Re: 83 550 Gas Cap Seal Question
> > > From: [email protected]
> > > To: [email protected]
> >
> > > Something no one else has addressed:
> >
> > > Gas expands when it sits in a enclosed tank in the hot sun, whether
> > > the tank's been filled with the bike on its center stand or not.  The
> > > fix is to not fill the tank too full.
> >
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