Fuel Tank over flow tank leaking gas.

There is no overflow hose. There is a vapor recovery line but that won't leak liquid fuel as there is about a five gallon air bubble on top for a crush zone. What you're more likely seeing is the return line from the pressure regulator is leaking. The clue is the engine will still run. If the supply line is leaking, the engine won't run because there won't be enough fuel pressure.

If the leakage is occurring with the engine off, it's due to expansion as the fuel warms up. That is more likely to come from the supply line. Look for rusted off hose clamps near the tank. I've had to replace mine a few times on my '88.

There shouldn't be any liquid in that tube. I've been searching through the service manual and I can't find a picture of the filler tube. From past experience, that filler tube extends down another few inches into the tank. Once you fill the fuel to the top of the pipe opening, fuel backs up into the tube to shut the pump off. That leaves a lot of air in the top half of the tank.

I never pulled that vent tube out so I don't know how far down it sticks into the tank. My best guess is it goes in far enough to hit liquid. Expansion would explain why liquid is in there to leak out. I think you're looking at one of three possibilities. The rubber hose is deteriorated, the metal tube has a rust hole, or the hose clamp is loose or missing. I've had to replace rusted hose clamps many times on mine.

The rollover valve is not the answer. Expanding vapor goes through it to the charcoal canister to be stored and burned in the engine later. The pressure relief function is a backup to the gas cap. The cap vents excessive pressure which isn't much. It should release over about two pounds of pressure.

By "regulator", you mean the rollover valve, right, not the pressure regulator on the engine? You can try it. First you might try removing the hoses from the charcoal canister. If vapor comes shooting out of one of them, something is plugged related to it. There's a fiber filter on the bottom, but they give such little trouble we never monkey with them.

Never saw a defective regulator on a Chrysler product. The closest I ever saw was a cut o-ring around the nozzle on a brand new car. The symptom was about a 15 second crank time, then it ran fine.

Come on now, I just got done telling someone I've never seen a defective regulator on a Chrysler product. You're making me a liar. Just to be sure I'm clear, you replaced the pressure regulator on the fuel rail on the engine, right? Do you have any idea what's wrong with it?

That's a very common failure, ... On GM trucks. I never heard of that happening before on a Chrysler product. So how did that cause fuel leakage back by the tank? All that regulator controls is the pressure in the fuel rail and the line from the pump to the rail. It doesn't have any affect on the pressure in the tank itself. Gonna have to add this to the memory banks.

There's a clinker in yer thinker. Once the fuel leaves the regulator, it's under 0 pounds of pressure. The fuel that stays behind in the rail and supply line is what's pressurized. To look at it another way, if there was pressure in the return line, how could the regulator drop the pressure in the supply line when necessary?

The volume of fuel going through the return line is the same as the amount leaving the tank in the supply line minus the miniscule amount used by the injectors. That should create a very small amount of vacuum in the tank, but the constant stirring of the fuel causes more of it to vaporize and expand. That's why the pressure goes up in the tank.

We can't argue with success. I'm disappointed the regulator was leaking, but I'm real happy you found it. If I can't get to sleep tonight, at least I'll have something of value to think about.