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Display Mesage #94346


Gas leak in vacuum line
Written by lcshepp on 6/22/2010 at 02:40 am

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. That helps a lot. I suspect that Jim
won't want to tackle it himself but that information could be useful to
a mechanic that I'm hoping Jim will be able to find.

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

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Message Thread for message #94346

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