Results 1 to 5 of 5

Thread: Leaking 1974 gas tank

  1. #1
    Registered User
    Member ID
    CZCC-19431
    Join Date
    Jun 2009
    Location
    california
    Posts
    28

    Exclamation Leaking 1974 gas tank

    Hey everyone I have a 260z and the gas tank leaks if I fill it up past half tank. I changed the sending unit and I changed the oring and lock twice but it still leaks! I watched it leak from the unit so I know for a fact It comes from there. Also I capped off all the unnecessary vents. So my question is WHAT THE HECK IS WRONG WITH MY TANK?? And if i do infact need a new tank where might I find one for cheap preferably used as I dont have much cash like the typical college student. anyways HELP PLEASE!
    Last edited by z4life92; 01-17-2012 at 02:57 PM.

  2. #2
    Registered User beermanpete's Avatar
    Member ID
    CZCC-21519
    Join Date
    Apr 2010
    Location
    Northridge, California, U.S.A.
    Age
    56
    Posts
    631

    Default

    If the fuel is leaking past the o-ring then the tank or sender unit might be bent or have a small flaw in the sealing surface such as a scratch or pitting due to rust. Inspect the surface carefully for any irregularity.

    The sender unit has a feed-thru for the wire. Perhaps it is leaking at the feed-thru.

  3. #3
    Registered User
    Member ID
    CZCC-20230
    Join Date
    Oct 2009
    Location
    The z is in Pittsburgh
    Posts
    294

    Default

    Seam leak?

    It's a sloppy way to troubleshoot, but if it is a seam leak and it's anything faster than a slow drip you should be able to fill the tank a little past half way and spot it with a flashlight. Wipe the tank down first and you'll see the source of the leak when the light hits the fluid.

    The above mentioned check of the level sender sealing surface is a good idea, too. Again, if the leak is from there, you'll see it with a flashlight.

    As a final note, it may be a good idea to take the tank out of the car at this point. Pain in the arse, but you'll have a full view of every angle of the tank and you can use a very small amount of gasoline and just roll the tank around as needed. Or, you could just take this opportunity to replace the tank with another one *shrug*
    Last edited by BTF/PTM; 01-17-2012 at 03:45 PM.

  4. #4
    Registered User Powderkeg's Avatar
    Member ID
    CZCC-8478
    Join Date
    Jun 2005
    Posts
    222

    Default

    I don't think the gas tank has any "unnecessary vents". I could be wrong though.

    Look into getting the POR-15 tank coating system.
    Also search on this site for removing the gas tank. It's not that difficult.

    Good luck.

    Dave Ruiz
    76 280Z

  5. #5
    Registered User olzed's Avatar
    Member ID
    CZCC-20649
    Join Date
    Dec 2009
    Location
    Auckland. New Zealand.
    Age
    75
    Posts
    1,069

    Default

    Are you sure it's not a leak from the filler hose?

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Replies: 50
    Last Post: 09-25-2014, 07:03 AM
  2. Gas gauge/tank unit quit working. How to test tank?
    By Kerrigan in forum Help Me !!
    Replies: 3
    Last Post: 02-03-2008, 12:00 PM
  3. Fuel tank leaking...
    By usafdarkhorse in forum Help Me !!
    Replies: 13
    Last Post: 11-07-2007, 02:33 PM
  4. leaking fuel tank, how to seal?
    By clutchdust in forum Carburetors (S30)
    Replies: 3
    Last Post: 02-08-2006, 09:13 AM
  5. Replies: 0
    Last Post: 11-16-2005, 05:51 AM

Tags for this Thread

Bookmarks

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
  •