I recently dropped my fuel tank to install my holley pump and noticed the fuel neck had been cut with a small section of rubber filler neck hose connecting them. While it did make removing the tank much easier i noticed that the neck had a smaller inner tube and when looking at the filler neck close to the cap..there is a welded hole. I can only assume the inner tube connected to a hole in the filler neck...presumably to vent air while gas goes in? Now as you can see the tube vents to nothing. Critical orrrrr? As of now the charcoal canister is not hooked up as the throttle body is shaved of the appropriate vac lines so that can freely vent so I wasn't sure if this was even necessary anymore. I'd prefer not to buy a new tank of I can avoid it.

 

That extra line is there so that the tank can vent while filling it. No harm in that like it is as long as you can still put gas in it.

 

I took a look at my 91 ta and see that the welded hole was actually a tack weld that held that line up and close to the two holes above above the fill hole so I see how it was now. Yea I'll just leave it. Thank you!

 

I've done this modification to 2 third gen tanks and works great for removing/installing them. I cut mine much lower though. Large fuel fill rubber to splice the fill tube and smaller diameter rubber hose to connect the smaller inner tube to top so it can vent while filling.

Reminder to anyone considering this, do the cutting with tank NEW, NOT a tank that has had ANY fumes or liquid in it lest you BLOW YOURSELF UP. You will literally DIE if the gasoline explodes, and gasoline vapor is EXTREMELY explosive.

 

^^^ This ^^^ !!!!!!

It only takes a BARELY SMELLABLE amount of fuel vapor to be deadly explosive.

Back in the day, people would weld on gas tanks, by filling them up with exhaust from a nearby car first. Not saying I have ever done this, or ever would, or would counsel somebody else in the mode of "here's how you can do it, sounds sketch butt it's OK"; only, I knew more than one person that did it, and lived afterwards. Of course I also knew somebody that went skydiving one day and his parachute failed to open, and yet he survived: I also don't get on all the skydiving forums and tell people "you don't need a parachute, I personally knew ..." This falls into the same category.

I think it would be wiser to use a tubing cutter, rather than a wizz wheel. Or even a portable band saw or a hacksaw.

Lots of factory gas tank neck setups come with rubber splices, such as my truck; that part can't be too bad, if done right.

 

Also just as another option, the late 4th gen LS tanks 99 - 02 are easy to adapt, have good fuel pump options, don't rust, and already have a removable filler neck... i have been slowly converting all my 3rd gens to those tanks as work needs to be done on them

 

I was considering it. I have the Holley hanger and pump assembly already so I was hesitant to swap it out. My tank is in really good condition but I may eventually swap it over to a plastic tank