Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Strange valve

Discussion in '1982-Present GM Diesel' started by 4x4_76, Aug 18, 2001.

  1. 4x4_76

    4x4_76 1/2 ton status

    Joined:
    Jul 22, 2001
    Posts:
    628
    Likes Received:
    0
    Location:
    Ylämaa, Finland
    My brother was welding new steel on his 'Burbans fenderwell,and he found small drain valve or something like that on the right frame rail.It's located right in front of the fuel tank,and it sticks out in the midlle of the frame.It has small rubber plug,and when it was removed,diesel fuel came from there.We were wondering that what purpose it has?Draining the fuel tank?

    I'm too lazy to stick shift,that's why I prefer autotranny.
     
  2. 6.2 man

    6.2 man 1/2 ton status Premium Member

    Joined:
    Feb 17, 2000
    Posts:
    636
    Likes Received:
    1
    Location:
    Curtis , WA
    That valve is used to drain water out of the tank .....diesel is heavier than water and it floats to the top and siphons off the water
     
  3. 4x4_76

    4x4_76 1/2 ton status

    Joined:
    Jul 22, 2001
    Posts:
    628
    Likes Received:
    0
    Location:
    Ylämaa, Finland
    Ok.For a monent I thought that someone could stole all your fuel if knows that valve.So it takes only from the top of the tank...half gallon or so?

    I'm too lazy to stick shift,that's why I prefer autotranny.
     
  4. NewK5Guy

    NewK5Guy 1/2 ton status

    Joined:
    Mar 2, 2001
    Posts:
    556
    Likes Received:
    0
    Location:
    Alexandria, VA
    Correction(but I coule be wrong): Water is heavier than diesel fuel. The water settles to the bottom of the tank. Excess water can be pushed out through that water drain hose by the weight of the fuel on top. If only diesel came out, then you are in good shape. The tank water drain hose is a last resort to fuel problems where too much water has been introduced into the system. The fuel pickup filters for the diesel tanks are even designed to filter out water to leave it in the tank. No water means you've been using good fuel.
     
  5. tshiko

    tshiko Registered Member

    Joined:
    Apr 13, 2001
    Posts:
    26
    Likes Received:
    0
    I though that it was an intake valve, not a drain ... and it could be used with an air compressor to push the fuel through the line when you get air in the fuel line (say after a filter change).

    The drain valves are usually at the bottom of the primary fuel filter located on the firewall.
     
  6. 4x4_76

    4x4_76 1/2 ton status

    Joined:
    Jul 22, 2001
    Posts:
    628
    Likes Received:
    0
    Location:
    Ylämaa, Finland
    Yep,you're right,water is heavier.I had to check it on my chemistry book.

    I'm too lazy to stick shift,that's why I prefer autotranny.
     
  7. 6.2 man

    6.2 man 1/2 ton status Premium Member

    Joined:
    Feb 17, 2000
    Posts:
    636
    Likes Received:
    1
    Location:
    Curtis , WA
    I stand corrected ! I did forget water is heavier than diesel .
     

Share This Page