Gas Tank Trouble

That's an important endorsement.

I had a new factory replacement under-seat tank (a Jeep factory part) as an aux tank in my '73 with a Stant cap. It leaked through the cap.

The MTS cap must be something special.

 

Patrick, if you have no vent line and now an un-vented cap, do you get a vacuum in the tank when operating? Seems to me this would make a lot more work for the fuel pump, enhance the possibility of vapor lock, and on the other extreme, could allow pressure buildup when not operating, especially when temps are hot. I use a non vent cap in the 3B but put a small orifice (about .050) breather in the tipover line, mounted as high as I could get it (up against the bottom of the left rear wheel well). It has a sintered bronze filter on it to keep the debris out of the tank and is mounted facing down to provide an air lock to keep water out, at least for a short term exposure.

I have the same problem as you did with the vented cap on my CJ5 that still has not been addressed but intend to do the same thing to it.

 

Sorry, missed that last line, Patrick

 

Turiwks--Not to jump in on this too late, but your fixes are simple and inexpensive as Howard Eisenhauer has suggested. Your crimp-ended fitting is the fuel pickup line, and needs the crimped fuel line removed, and replaced with a short section of steel line that your rubber fuel line can be attached to, with the other end feeding your fuel pump; then the larger hex nut portion needs to be re-soldered back onto the base of the tank to seal it from ever leaking. That threaded brass elbow looking fitting is the location of your original drain plug, remove this fitting and find a drain plug that will fit at any hardware store. If you have any additional holes/leaks, POR-15 is the solution, as it will coat the whole inside of your tank, and prevent any future rust or leak issues; the POR-15 will be the expensive fix as it runs about $35-40 at automotive paint supply shops. Have fun with your new toy!

 

{ Any ideas? What can I do to repair this tank? Weld that hole shut? Also, when I fill the tank, it leaks out of the tank from the hole, not from the crimped part of }
Caution Before welding any fuel tank purge with air for at least 24 hours before hand to remove vapors & purge while welding, Welding + Vapors= DEATH by explosion

 

Usually radiator shops will do repairs on gas tanks. I expect they fill the tank with CO2 (dry ice) prior to working on the tank. Also I doubt they would weld - instead they'd solder.

I suggest you ask around for a radiator shop that will do the work for you. You can coat the inside of the tank yourself if you want - POR-15 makes a kit http://www.por15.com/FUEL-TANK-REPAIR-KIT/productinfo/FTRK/