Gas dripping at rear after fill-up

[mally002]

I just filled the tank on the 240 and noticed gas was dripping from the rear. After inspection it appears to be running down a black hose that is located almost at the far rear. If you look up from the ground it is behind the tank, nearer the taillight(right side).

Any ideas why at half a tank it doesnt leak, but full it's dripping?

Thanks,

[ddezso]

Mine does the same thing. I think it's probably a cracked or partially disconnected filler hose. My fix so far is to never fill it up. That is a lame fix but all I can do until I can drop the tank and fix it properly..

[e_racer1999]

Mine does the same thing. I think it's probably a cracked or partially disconnected filler hose. My fix so far is to never fill it up. That is a lame fix but all I can do until I can drop the tank and fix it properly..

haha... that's the fix i did with my other 72 that i no longer have. i got a filler tube and never put it in.

[MikeW]

It may be the filler hose as suggested but it may also be some of the other vent hoses.

[mally002]

Thanks for the info, I think you guys are right. After I ran some gas out it completly stopped....so I'm taking your advice and never filling up.

[Arne]

Better to find the leak and repair it.

[jmortensen]

It could be the filler, any of the vents, or the sender. It shouldn't be hard to chase down a leak in a Z tank, but I fought with one for a couple years off and on. Now I'm convinced that tank was leaking from the seam between top and bottom, no matter anymore, going fuel cell now...

[e_racer1999]

couldn't it also be an actual hole in the tank?

[TomoHawk]

You could probably do yourself a big favour, and get your tank cleaned & seled. then you'll find the leak, and have a perfetly rust-free gas tank with all new (and safe!) fuel hoses. The downside of this is that it may be expensive. Eventually, it will need to be done.

[a7dz]

After rereading this post I would have to say the most likely candidate is the vent hose on the top side of the tank which just happens to be the one with fuel on it when full. Located on the right side of the car. That would be the first place I went.

When the seams leak the fuel doesn't normally follow a hose to the low point it could but, not as likely as the hose leaking it self.

[JimmyZ]

Hopefully it is as simple as a rotted soft line. My tank had one of the vent tube leaded joints crack. Couldn't fill it up beyond half until I cleaned it and applied copious amounts of JB weld. This sealed it for quite a while. Amazing stuff that JB weld.

While my Z was in a million pieces during resto I cleaned the tank and cut an access hole for sandblasting. (After completely removing any chance of fuel or vapors being present) Had the local radiator shop resweat all of my vent lines and filler neck. By now the inside of your tank probably has a decent amount of rust anyway. The tenacity of the rust was so great I had to sandblast and Ospho twice to get it all out. Look into getting RedKote liner if you decide to clean/line the tank. It is removable with MEK and fills pinholes well. The guy at my local radiator repair shop showed me a slew of tanks that had been sealed with other products. Renu's process and service is the best with proper prep/RedKote coming in second place according to the rad shop.

Please be extra careful with raw fuel or vapors. I sustained second and third degree burns over 50% of my body years ago... All from half a cup of gas. It ignited twelve feet away from me! (Had a lawn service) Cutting and scrubbing off your skin for a month is no fun!

My 2c

Jim

[geezer]

I once got a great tip from a bike builder. He used a product from the Maytag people, used to remove rust from dishwashers and such. Labeled "for professional use only", and for good reason. The fumes can cause serious lung damage. That didn't deter me, I used it in a gas tank, with about 10% black diamond sand mixed in, as he instructed, sloshing around for a few days in my spare time. The results were astounding, shiny as a new silver dollar.