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Display Mesage #94779


Gas leak in vacuum line
Written by literidr on 7/6/2010 at 04:01 am

Hey Greg,

I've not had the pleasure to work on the California Evap. system from the
Carburetors, but you shouldn't be seeing any fuel in those hoses, only fumes.
So, I would think that you should check the same things on your bike as well.

John Handford, literidr@...
Taylors, SC
'90 PC "Spirit"
'94 PC "Chance"

--- In ipcrc@yahoogroups.com, "gm29484golf" <gm29484golf@...> wrote:
>
> I am having the same problem with my 90 PC. Are you guys talking about the
Evaporative emmisions carb air vent control valve? It has 4 lines on it and the
bottom tube is the one spewing gas on mine. I thought it might be a stuck
float... Just wondering if i could or should try and tackle it or just take it
to my Honda dealer... what you guys think?
>
> thanks,
> Greg
>
> --- In ipcrc@yahoogroups.com, "literidr" <literidr@> wrote:
> >
> > Hey Leland,
> >
> > Two of those hoses vent the chamber above the float bowls, the other hose
goes to a T that connects to the carburetor side of the slide diaphrams on both
carburetor. My guess is that the third line has a small amount of vacuum that
allows the engine to consume any vapor from the float bowls while the engine is
running. The large open hole is merely a vent to atmosphere to vapors
genereated once the engine is shut down. If you have fuel coming from the open
tube then you have a problem with one of the floats in one of the carburetors.
I would guess that one of the floats has developed a leak and is no longer
shutting the fuel supply off once the proper fuel level is achieved. That's
where I would start looking.
> >
> > To check the float bowls, just remove the air cleaner, then loosen the
clamps that hold the carbs to the intake rubbers. Rock the carbs back and forth
until they come out of their rubber tubes, then turn the carbs over (fuel is
going to spill out) and remove the bowls to check the floats. Check the floats
for fuel inside them, and check the needles and seats to be sure they are
securely seated and the needles moving freely. Hopefully, this will help you
locate your problem.
> >
> > John Handford, literidr@
> > Taylors, SC
> > '90 PC "Spirit"
> > '94 PC "Chance"
> >
> >
> >
> >
> > --- In ipcrc@yahoogroups.com, "Leland C. Sheppard" <lcshepp@> wrote:
> > >
> > > Hi Coasters,
> > >
> > > Douglas Van Bossuyt and myself have been trying to help Jim Day solve a
> > > mystery with his '96 PC. Jim lives in Hawaii and the local dealer won't
> > > work on the bike because it is over 10 years old...
> > >
> > > He has a small gas leak and the associated smell. I thought it would be
> > > the petcock but Jim tightened the screws (which were a little loose) and
> > > the smell persisted.
> > >
> > > I pulled some plastic off my '96 so we could compare notes and, with
> > > Douglas' help, we have determined the following:
> > >
> > > There is a little 4-way connector below and to the rear of the petcock.
> > > 2 of the lines coming from it are vacuum lines and 1 of those goes to
> > > each carburetor. We aren't sure where the 3rd line goes. The fourth
> > > connector is open on 49-state bikes. On CA bikes, an emissions hose is
> > > attached to this fourth connector. It is the 'Evaporative Emission
> > > Carburetor Air Vent Control".
> > >
> > > If Jim puts his finger over the opening from that connector, his engine
> > > speeds up. On mine the engine speed changes when I cover it. In both
> > > cases, I suspect the level of vacuum in the motor is being affected by
> > > closing off this connector.
> > >
> > > Jim is getting a small amount of gas out of this connector; none comes
> > > out on mine. What we are trying to figure out is where the gas is
> > > coming from. It's most likely from the carbs but how and why are not
> > > clear to us.
> > >
> > > Has anyone else experienced this and what did you do to cure it?
> > >
> > > Thanks for any info on this.
> > >
> > > Leland
> > >
> > > --
> > > Leland Sheppard
> > > Placerville, California, USA
> > >
> > > ...Life is good on the Pacific Coast...
> > >
> > > '94 Pacific Coast, "Black Beauty", 211,500 miles
> > > '89 Pacific Coast, "Shadow Dancer", 118,475 miles
> > > '90 Pacific Coast, "Red Baron", 106,100 miles
> > > '96 Pacific Coast/SuperSport sidecar, "Handsome Hannigan", 31,150 miles
> > > '02 Ural Patrol, "Boris Blueanov", 15,250 kilometers
> > > '89 GB500, "Little Bugger", 13,692 miles
> > > '02 GL1800, "Copper", 55,850, '07 Aspen Classic, "Copper's Camper", 1,545
miles
> > > iPCRC #72; IBA #10582; AMA #481368
> > >
> > > Mother of all PC800 Web Site Lists: http://www.pc800links.net
> > >
> > >
> > >
> > >
> > >
> > >
> >
>

Message Thread for message #94779

lcshepp
6/20/2010, 08:49 am
Gas leak in vacuum line
Hi Coasters, Douglas Van Bossuyt and myself have been trying to help Jim Day solve a mystery with his '96 PC. Jim lives in Hawaii and the local dealer won't work on the bike because it is over 10 years old... He has a small gas lea

    troy.ohio_pc800
    6/20/2010, 12:36 pm
    Gas leak in vacuum line
    My guess would be the petcock diaphragm is still seeping a tiny bit of fuel. It's something not always solved by tightening the cover screws on the auto fuel valve. Just a drop or two of fuel can cause quite a stink in a hot garage!

      douglasvanb
      6/20/2010, 01:47 pm
      Gas leak in vacuum line
      But would that cause gasoline to come out of the four hose barb contraption's open port? We determined that it is definitely coming out of that port and not from the petcock. Are the petcock and that four-way connector connected together?

    literidr
    6/20/2010, 11:09 pm
    Gas leak in vacuum line
    Hey Leland, Two of those hoses vent the chamber above the float bowls, the other hose goes to a T that connects to the carburetor side of the slide diaphrams on both carburetor. My guess is that the third line has a small amount of vacuum

      daviddockstader
      6/21/2010, 06:30 am
      Gas leak in vacuum line
      Yes, I think this is exactly right, and on what I believe to be a properly functioning bike, when that vent is covered at idle, the engine will slow and eventually stall. I imagine with no air vent the engine just can't draw gas. If the engin

      gm29484golf
      7/5/2010, 07:47 pm
      Gas leak in vacuum line
      I am having the same problem with my 90 PC. Are you guys talking about the Evaporative emmisions carb air vent control valve? It has 4 lines on it and the bottom tube is the one spewing gas on mine. I thought it might be a stuck float... Just

        literidr
        7/6/2010, 04:01 am
        Gas leak in vacuum line
        Hey Greg, I've not had the pleasure to work on the California Evap. system from the Carburetors, but you shouldn't be seeing any fuel in those hoses, only fumes. So, I would think that you should check the same things on your bike as wel

    jimkeal
    6/21/2010, 01:00 pm
    Gas leak in vacuum line
    I'm in the process of bringing Rick Corwine's bike back from the brink and I have this same problem. I rebuilt the carbs and I now have a leak at the bowl on the left side and sometimes a leak from the 4 way connector too. I need to take it a

    lcshepp
    6/22/2010, 02:40 am
    Gas leak in vacuum line
    Hi John, > Two of those hoses vent the chamber above the float bowls, the other > hose goes to a T that connects to the carburetor side of the slide > diaphrams on both carburetor. snip... Thanks VERY much for that info