Best additive to get rid of varnish in fuel system

Results 1 to 9 of 9
  1. #1
    Registered User
    Join Date
    Feb 2002
    Location
    Langley BC
    Posts
    1,671

    Best additive to get rid of varnish in fuel system

    I used about 2 gallons of old gas in moment of weakness and now fuel tank and system has a lot of varnish in it. Drained it a few times but too late. Varnish is growing. What is best additive to clean? Even if I boil or change the tank the varnish is still in lines and fuel log. Truck drove okay but tank stunk and problem not getting any better.
    MINT: Definition:

    in mint condition
    in perfect condition: in perfect condition as when first made

  2. Remove Advertisements
    BC4x4.com
    Advertisements
     

  3. #2
    Registered User
    Join Date
    Sep 2008
    Posts
    57

    Re: Best additive to get rid of varnish in fuel system

    atf

  4. #3
    Registered User
    Join Date
    Jan 2010
    Location
    Langley
    Posts
    17

    Re: Best additive to get rid of varnish in fuel system

    Varnish forms in fuel systems that have sat with fuel stagnant in them for extended periods. Running a few gallons of bad gas will not likely cause this varnish buildup unless it was allowed to sit stagnant in your truck.

    As long as the fuel did not sit in the truck for long, a fresh tank of fuel and any decent additive should have it back to normal in a tank or two. Varnish will not grow or plug up fuel lines, it will gum up small pasages like injectors or carburetors. Avoid additives with alchohol as they attract moisture.

    Although ATF has detergent properties, it is not advisible on any modern engine. The ATF oil may clean the fuel system (it will do just the opposite if left in the fuel for long) but also plug up the catalytic converter.

  5. #4
    Registered User
    Join Date
    Feb 2002
    Location
    Langley BC
    Posts
    1,671

    Re: Best additive to get rid of varnish in fuel system

    Thanks for replies. Vehicle not licensed so dont go through a lot of gas, but ran at least every few days. Tried stabil but seems to have no effect, maybe even worse. Changed tanks now but varnish still in lines etc. Saw on diesel site someone did gas chromatography on seafoam and it was almost 100% kerosene. Was looking for some sort of varnish dissolver. Industrial strength gumout or similar.
    MINT: Definition:

    in mint condition
    in perfect condition: in perfect condition as when first made

  6. #5
    Registered User
    Join Date
    Apr 2006
    Location
    Abbotsford
    Posts
    807

    Re: Best additive to get rid of varnish in fuel system

    have you changed the fuel filter if it's gummed up it'll run like crap too
    Herd of Turtles member
    VE7TOY
    73 Plymouth Scamp

  7. #6
    Registered User
    Join Date
    Feb 2002
    Location
    Langley BC
    Posts
    1,671

    Re: Best additive to get rid of varnish in fuel system

    Not yet but I am sure it is pretty restricted. Truck ran okay but for how much longer I dont know. Had to unseize the fuelpump once already...
    MINT: Definition:

    in mint condition
    in perfect condition: in perfect condition as when first made

  8. #7
    Registered User
    Join Date
    May 2008
    Location
    vancouver
    Posts
    626

    Re: Best additive to get rid of varnish in fuel system

    For the amount of energy time and money spent seeking a fix for fouled fuel sometimes it's easier to drain tank lines and clean the system with fresh gas and additives!

  9. #8
    Registered User
    Join Date
    Feb 2002
    Location
    Langley BC
    Posts
    1,671

    Re: Best additive to get rid of varnish in fuel system

    I changed tank, changing injectors now, will do filter before I run it. There is a varnish buildup on inside of lines and fuel rail. How do you clean those?
    MINT: Definition:

    in mint condition
    in perfect condition: in perfect condition as when first made

  10. #9
    Registered User
    Join Date
    May 2008
    Location
    vancouver
    Posts
    626

    Re: Best additive to get rid of varnish in fuel system

    Quote Originally Posted by bobknob View Post
    I changed tank, changing injectors now, will do filter before I run it. There is a varnish buildup on inside of lines and fuel rail. How do you clean those?
    Inside of the lines I have no idea
    Fuel rails as in injectors?
    How long did this sit for?

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •