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Fuel tank squirting fuel.

Discussion in 'Technical' started by Bolly, Nov 16, 2017.

  1. Bolly

    Bolly Member

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    My 2007 EFI Mastiff squirted fuel under pressure to the ground just behind the front wheel from a small black rubber tubing under the fuel tank.. I just parked the bike after a ride in Hot Weather.. It seems to be releasing tank pressure?
    Also thinking there has to be pressure relief valve which isn't working properly? There seems to be no Vent on the Fuel cap?
     
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  2. Bolly

    Bolly Member

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    Sorry, it's a 2008 Model..
    The black hose is not connected to the fuel line.. It's loose..
    Its pointing downwards like a Vent pipe..
     
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  3. Mr. Wright

    Mr. Wright Guru
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    Can anyone help Kevin out? This is out of my league.
     
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  4. Bolly

    Bolly Member

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    Sorry i took so long.. Its under the tank..Looks like a Vent pipe?
     

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  5. Bolly

    Bolly Member

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  6. BWG56

    BWG56 Guru

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    [​IMG]
    [​IMG]
     
    #6 BWG56, Nov 17, 2017
    Last edited: Nov 17, 2017
  7. Bolly

    Bolly Member

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    Not going into the battery box... Yes...Same hose..
     
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  8. woodbutcher

    woodbutcher Mr. Old Fart member #145
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    isn't that bung just supposed to have a plug in it?????????

    don't know about the EFI but the carb version only has the petcock and a plugged bung for a drain on the bottom of the tank.
     
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  9. BWG56

    BWG56 Guru

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    Did the hose just break and need replaced, it comes outta the bottom of the tank but the one with the arrows looks like its coming from the front of the bike.
     
  10. Th3InfamousI

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    I would plug it and see what happens. Worst case scenario you need to replace the gas cap so it vents properly.

    There's no need for that to vent there and we all know that vent line breaks and if that happens while riding your gonna have a really bad day. Might need a fire extinguisher handy.



    Sent from my 2PS64 using Tapatalk
     
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  11. Th3InfamousI

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    Pretty much, I just added the fire element to it for a little extra pizzazz.

    Sent from my 2PS64 using Tapatalk
     
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  12. heybaylor

    heybaylor Active Member

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    ok , I see the open end of the line, where does the other end go ?
     
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  13. BWG56

    BWG56 Guru

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    Maybe if its an extra vent line it would be a better fix rather than the gas cap vent that's always removed and then the paint bubbles. As far as safety, my gas line to the carb goes thru the jugs and I replace it every so many years and never had one break, so why not just replace the hose. Its cheap. I'm curious though to find out where the other end goes in the front of the tank.
     
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  14. Th3InfamousI

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    It doesn't go anywhere... Picture is upside down. It's the same hose in both pics they looped it back up and probably just used the gas tank mount to hold it in place

    Sent from my 2PS64 using Tapatalk
     
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  15. Bolly

    Bolly Member

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    When I bought the bike, it came with a Sissy bar and a Big Dog Bag..
    Inside the bag was a large black canister with Harley Davidson stamped on it..
    Now I'm thinking did it come from the Mastiff? and did someone remove it.. But I can't see where it would go.?
    Was going to throw it in the bin but decided to keep it.. I asked the Importer about it and he's never seen canisters fitted to these Big Dogs..
    Tomorrow I'll take some pics of the canister and see if anyone has seen this canister on a Big Dog..?
     
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  16. pauly

    pauly Active Member

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    My Mastiff is the same year as yours and it was an EFI before I have converted it to carb.
    There are only three fittings on the bottom side of the tank. The front two are for the cross over hose
    and the third one towards the back of the bike is plugged with a plug.

    Paul.
     
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  17. oss

    oss Member

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    Not to hi-jack, but my chopper has a carb. It's got a vent line also.
     
  18. BWG56

    BWG56 Guru

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    The hose with the fitting is at the back of the tank and the pic with the hose with arrows is by the front of the tank. Looking at it again I think the 2 hoses shown are different sizes.
     
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  19. BWG56

    BWG56 Guru

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    Can you take a pic of where it is connected and where it goes?
     
  20. Bolly

    Bolly Member

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    Will double check tomorrow..
     
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