Leaking vent pipe on fuel tank?

Discussion in 'The Bench' started by Deer, Jul 27, 2018.

  1. Deer

    Deer Well-Known Member

    Hi.
    I noticed some fuel leaking from the fuel tank and went under to see where it came from.
    The larger vent pipe is loose and I could drag it out of the fuel tank.
    Can I fix this in a good way without replacing/removing the tank?

    I have tested permatex before as you can see.

    (and I need to replace the thin hose also..)

    Thanks

    DSC_1457.JPG
     
  2. copperheadgs1

    copperheadgs1 copperheadgs1

    Is it the hose or nipple that is leaking? (I just wanted to write nipple)
     
    Waterboy likes this.
  3. Deer

    Deer Well-Known Member

    :D

    I’m not sure.

    First, I thought it was my short thin hose, plugged with a screw that was leaking thru the screw (short hose removed before picture), wet looking. I parked so it wouldn’t leak more while the exhaust pipe was hot and went under for fixing the thin hose, But when I felt that the larger nipple was completely loose I just assumed that it was the real leak.
     
    Last edited: Jul 27, 2018
    copperheadgs1 likes this.
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    It's the vent. Pull it off and replace it with new fuel line hose. There should be an element on it. Looks like this,

    https://www.opgi.com/gto/CH28013/

    There is no fuel pressure there, but if the hoses are rotted, they will leak when you fill the tank.
     
  5. deluxe68

    deluxe68 Well-Known Member

    I'm pretty sure the one I purchased from inlinetube came with the hoses already attached.
     
  6. Deer

    Deer Well-Known Member

    I have one big vent valve on the larger hose, mounted high on the frame.
    But I like the design on the GTO fuel tank vent valve and will order it.

    DSC_1457.JPG

    But It don’t seem right that the larger pipe moves freely in and out of the tank.
    Can’t fuel come out on the sides of the pipe?
    Shouldn’t I try Permatex or chemical metal to fix the pipe to the fuel tank?
     
    Last edited: Jul 28, 2018
  7. yachtsmanbill

    yachtsmanbill Well-Known Member

    I think where the tube is soldered into the tank let go. Short of dropping the tank to make a "hot" repair, I'd clean the area shiny clean (can you pull the tube all the way out?) and make a repair with JB weld (or a similar tank repair epoxy) with probably two app's. One that gets almost cured and a second for a good chemical bond. I say a double pass if the fumes affect the adhesion to a point. get them sealed first and then a pass to secure it. Id also have the hoses on as this is happening so as not to disturb or strain the pipe after its glued. JMHO.... ws
     
    Last edited: Jul 29, 2018
    Waterboy likes this.
  8. copperheadgs1

    copperheadgs1 copperheadgs1

    Get the tank empty as possible so it’s dry to repair. Don’t use GTO parts on your Buick. Things could be different.
     
  9. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    If the tube is broken or loose out of the tank it needs to be pulled and soldered. JB weld will work for about 5 minutes. It's not a bad job
     
  10. Waterboy

    Waterboy Mullet Mafia since 6/20

    I'm sorry, but I agree with Bill and politely disagree with you Joe. I JB Welded my carburetor filter thing around the stripped threads on the front of the carb, and I did my boat gas tank that the previous owner drilled a hole through the gas tank. Neither one has leaked after many many years. Just my 2 cents.
     
  11. yachtsmanbill

    yachtsmanbill Well-Known Member

    Thanks John... I guess I sometimes take for granted that some people don't understand the concept of a field repair. Besides the prep cleaning and re-assembly complete before hardening to prevent strain on the repair. its most important to have both side of the repair "tinned" and I use that term loosely. You cant just lay the stuff on; it needs to get a good adhesion into the sanding grooves on both sides of the repair, assembled and then a smooth out with some spit on yer finger(!) If you don't get this concept, its like putting body filler (bondo) on top of dusty steel. JB sets up in about 5 minutes, so you don't prep and mix and then go take a, well you know, paper-work break.

    Kripes, I had a 1976 Mark IV Lincoln that sprung a whole in the top radiator hose at a rest stop near Itchycrotchy Fla. at 3 am. A nice blob of RTV and a wrap with some duct tape, and a two cigarette break, refilled with rest stop well water , I was back on the road headed for Fort Pierce. That hose lasted a full extra year before I traded the car in. Upon arrival, the damn judges pulled the cap and checked the PH with some litmus strips and discovered the raw water. NOT.

    Now if that were a cracked exhaust manifold.... ws
     
  12. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I believe JB weld doesn’t hold up to E10, but maybe it does in certain applications if it is not submerged in it. I know Cliff uses Marine Tex on the Q jet main well plugs. Might be safer to use that.
     
  13. DasRottweiler

    DasRottweiler -BuickAddict-

    I just noticed a small wet spot of gas where the filler tube is connected to the gastank itself. Will JB Weld or perhaps the above mentioned Marine Tex solve this ?
    Not a drip , yet, just a wet spot at union...
    Jim
     
    Last edited: Jul 30, 2018
  14. yachtsmanbill

    yachtsmanbill Well-Known Member

    Marine Tex is pretty good old fashioned stuff too. You can actually apply in underwater and it will push the H2O out of the way and adhere. Had a mustang with a pin hole and used some epoxy stuff on the bottom with a full tank that held till the car got beat to death... ws
     
  15. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I would think so Jim. The key will be cleaning that area well before applying the epoxy.
     
  16. DasRottweiler

    DasRottweiler -BuickAddict-

    Noticed after my first fillup. It's always sumthing....least I put roughly 50 or so miles on it. I'll have to burn some more gas before I attend to it to get the tank near empty. Jim
     
  17. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    I've never had anything hold up to gasoline. I didn't think the OP was looking for a "field repair" Sure if you're 1000 miles from home and need to slow it down or have it last until you make it home, then fine, JB weld it. If you want it fixed properly then the OP knows what he has to do.

    95% of the time when JB weld is involved it's not a proper repair. No one has time to the job right the first time but they always have the time to do the job a second time.
     
  18. jaye

    jaye Well-Known Member

    I noticed fuel leaking under my tank also I thought it was the hoses on the sender used original spring style clamps, I filled up today and drove to work on the way home I smelled gas when I got home I saw fuel dropping on the ground. When I went to see fuel was coming out of the plastic vent valve mentioned above. I'm lucky it didn't catch fire, the exhaust is a few inches below it. could/should I just attached a hose that just join the two pipes (loop).
    Thanks
    Jaye
     

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