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  1. #1
    Join Date
    Jul 2012
    Location
    Jersey
    Posts
    730

    Default Fuel line joints

    I've been suffering a small amount of air in the fuel feed to my engine for a little while and decided to remake some of the joints that may be suspect when under suction. Is there a 'best practice' method of achieving the valve connections in the photo. At the moment the threaded joints are sealed with Loctite 577 but I have a small weep from the 3/8" BSP hydraulic fitting on the right hand side which is the supply from the tank.

    IMG_1594res.jpg

  2. #2
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    16,566

    Default Re: Fuel line joints

    It looks like a compression fitting so no sealant should be required and possibly won't make any difference anyway. If it doesn't seal when you nip it up tight then it suggests that something is wrong with the mating surfaces ..... scoring or dirt.

    Richard

  3. #3
    Join Date
    Feb 2008
    Location
    Suffolk
    Posts
    3,486

    Default Re: Fuel line joints

    In theory you should not need any sealant on a fitting like that. You could just try tightening the fitting but I expect you've already done that. Perhaps replace the tubing from the tank?

  4. #4
    Join Date
    Mar 2015
    Location
    Isle of Eigg
    Posts
    6,344

    Default Re: Fuel line joints

    Quote Originally Posted by Keith-i View Post
    I've been suffering a small amount of air in the fuel feed to my engine for a little while and decided to remake some of the joints that may be suspect when under suction. Is there a 'best practice' method of achieving the valve connections in the photo. At the moment the threaded joints are sealed with Loctite 577 but I have a small weep from the 3/8" BSP hydraulic fitting on the right hand side which is the supply from the tank.

    IMG_1594res.jpg
    Theres a male/male barrel in that connection, isnt there? You might have luck with a new one.
    Just call me Dougal, Sir Dougal to you.

  5. #5
    Join Date
    May 2001
    Location
    North from the Nab about 10 miles
    Posts
    8,559

    Default Re: Fuel line joints

    +1 That type of joint should be self sealing. If not there's something wrong, usually damaged facing where it makes contact. It takes very little to break the seal, the mating surfaces have to be completely smooth to seal properly. Simply over tightening the joint to make its work further compunds the problem by causing further damage. Using a sealer rarely seems to work, its needs to have full metal to metal contact throughout.
    Is Conservation for wildlife or conservationists?
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  6. #6
    Join Date
    Jul 2012
    Location
    Jersey
    Posts
    730

    Default Re: Fuel line joints

    Quote Originally Posted by Lon nan Gruagach View Post
    Theres a male/male barrel in that connection, isnt there? You might have luck with a new one.
    As it happens, it is a new male/male barrel that I’ve used. I will need to undo it and take a closer look.

    Are such hydraulic fittings appropriate for diesel fuel feeds in a boat or is that a more reliable alternative?

  7. #7
    Join Date
    Nov 2016
    Location
    Lincoln
    Posts
    547

    Default Re: Fuel line joints

    As said they work by metal to metal contact so suitable for most fluids and gasses. It’s the flexible hose material that changes with use

  8. #8
    Join Date
    May 2007
    Posts
    33,495

    Default Re: Fuel line joints

    Check you don't have a mixture of BSP and merkin threads/fittings?
    I've been through this with an oil cooler years back.

  9. #9
    Join Date
    Nov 2004
    Location
    Medway, UK, boat in SYH
    Posts
    2,205

    Default Re: Fuel line joints

    personally I would move to a hose tail on the ball valve and a decent fuel pipe clamp

  10. #10
    Join Date
    Feb 2008
    Location
    Cornwall
    Posts
    644

    Default Re: Fuel line joints

    Put some tape around the suspect joint and test again to check it is the problem. Personally I would have sleeved soft copper pipe and use this jointed into any ball valve. Minimum joints is always better.......... works for me.

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