1986 VFR700F Gas Tank Question

Discussion in '1st & 2nd Generation 1983-1989' started by midlothianjoe, Sep 14, 2009.

  1. midlothianjoe

    midlothianjoe New Member

    Joined:
    Nov 24, 2007
    Messages:
    16
    Likes Received:
    0
    Trophy Points:
    0
    I have a 1986 VFR700F, on the underside of the gas tank there is three ports, 2 large ports and 1 small port on the front of the tank, the two large ports are tied together and then a single gas line is runs to the fuel pump, is this right or is the large port on the right side of the tank a tank vent or a reserve port. The manual I have does not show this in detail, thanks for the help in advance.
     
  2. racerxninja

    racerxninja New Member

    Joined:
    Jul 19, 2007
    Messages:
    11
    Likes Received:
    0
    Trophy Points:
    0
    my 86 vfr tank only has 2 ports. 1 for fuel and 1 for vent
     
  3. TOE CUTTER

    TOE CUTTER Mullet Man

    Country:
    United States
    Joined:
    Nov 30, 2008
    Messages:
    6,635
    Likes Received:
    41
    Trophy Points:
    78
    Location:
    Sacramento
    Map
    California tanks

    California tanks have three ports,small one in the front is tank vent,and is California only.The large one in the bottom rear left, as you sit on the bike, is to fuel pump, and the large one on the right is the over flow around the gas cap and vents to the ground.:thumbsup:
     
  4. crustyrider

    crustyrider New Member

    Joined:
    Jul 27, 2008
    Messages:
    5,012
    Likes Received:
    1
    Trophy Points:
    0
    Location:
    North Country, New York
    Map

    what TOE CUTTER said....
     
  5. vfrf2

    vfrf2 New Member

    Country:
    United States
    Joined:
    Aug 25, 2006
    Messages:
    109
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Manassas, VA
    Map
    Ditto, mine is a CA bike too. 1 in the front left going to the emissions, 2 in the back...1 for the fuel, 1 for vent.
     
  6. McViffer

    McViffer New Member

    Joined:
    Dec 29, 2008
    Messages:
    173
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Northern California
    So Im having carb problems...and Im remembering that you mentioned something about putting a 49 state tank on to a bike with california carb & emissions...?
     
  7. TOE CUTTER

    TOE CUTTER Mullet Man

    Country:
    United States
    Joined:
    Nov 30, 2008
    Messages:
    6,635
    Likes Received:
    41
    Trophy Points:
    78
    Location:
    Sacramento
    Map
    California gas caps are not vented, if you install a Ca. cap on a 49 state tank it will pull a vacuum and and fail to run after a short period .
     
  8. Lazy in AZ

    Lazy in AZ New Member

    Joined:
    Feb 10, 2010
    Messages:
    305
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Mesa, Az
    Map
    Mine is a California bike too (3 ports on the bottom of the fuel tank) and also has a canister at the front left of the bike. Is that a required item for the system to work properly? It doesn't show in my manual. What'll happen if I delete it from the system?
     
  9. supertex

    supertex New Member

    Joined:
    Jul 24, 2008
    Messages:
    895
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Sacramento, California, United States
    This is the emissions system. You definitely do not need this. Make sure you cap every port where the tubes from the system go onto the carbs or you will hear this little spitting of air every 15-20 seconds. I used rubber caps made to cover metal screws. Got them at Ace hardware.
     
  10. intercept_this

    intercept_this New Member

    Country:
    United States
    Joined:
    Apr 16, 2020
    Messages:
    11
    Likes Received:
    1
    Trophy Points:
    3
    I know this is an old thread but I have a relevant question. Which color port (see photo attached) goes to the fuel line and which one is a vent?
     

    Attached Files:

  11. Captain 80s

    Captain 80s Member

    Country:
    United States
    Joined:
    Apr 25, 2009
    Messages:
    1,894
    Likes Received:
    372
    Trophy Points:
    128
    Location:
    Edmonds, WA
    Map
    Green is fuel (it is right below the fuel valve)

    Red is not a vent, it is a drain tube if you overfill the tank. Look under the cap and you'll see a hole.

    If it was a California bike, there would be a vent spigot towards the front. On 49 state bikes the tank vents thru the cap key hole.
     
  12. intercept_this

    intercept_this New Member

    Country:
    United States
    Joined:
    Apr 16, 2020
    Messages:
    11
    Likes Received:
    1
    Trophy Points:
    3
    For the red overfill - my bike didn't have anythiny attached to this port. Should it have a tube or a cap?
     
  13. Captain 80s

    Captain 80s Member

    Country:
    United States
    Joined:
    Apr 25, 2009
    Messages:
    1,894
    Likes Received:
    372
    Trophy Points:
    128
    Location:
    Edmonds, WA
    Map
    Drain tube that runs down to the bracket in front of the rear brake pedal, with coolant overflow and battery vent tube.
     
    Last edited: Apr 24, 2020
Related Topics

Share This Page