93 3000gt top fuel tank leak - 1993 Mitsubishi 3000GT

Rusted or broke fuel lines.

if you have a fuel leak from top of tank then it could be a fuel line or O ring leaking, which can cause a drop in fuel pressure causing it to bog down. if its a steel fuel tank the tank could be rotted out. either way fix fuel leak first and go from there.

You could have a bad fitting or line connecting to the fuel tank leaking over the top of the fuel tank and just dripping down the side. A road hazard (nail, glass, piece of wood could have been thrown up and hit the tank causing it to leak, or you could have gone over something like a curb or parking lot obstacle that could have damaged the tank. Someone will have to put it up on a lift and examine it to find out which. Have it towed, gas leaks are nothing to play with.

check to see if the fuel filter is leaking at line connections as the filter is on top of the tank. if so replace the filter. check the seal for the tank unit that seals this to the tank. being this new it should be good its more likely the fuel filter.

Remove the tank & check it out
Tank leaks,Fuel Pump Gasket on top
of tank leaks,fuel lines leak or are rusted out.

sounds like sending unit gasket is leaking. drop the gas tank...sorry

There are two hoses running from the filler neck. Either of them could be leaking from the top. There is also a seal on the top of the tank where the fuel pump is that can leak. If your car leaks the whole time you are putting fuel in, I would suspect the hoses. If it only leaks when you get it full, then check the seal on the top of the tank. The top of the tank can be seen without dropping the tank. Remove your back seat and you will see a cover over the fuel pump. Remove that cover and you can see the top of the tank.

The fuel supply and return lines connect to the fuel pump on the top of the fuel tank. And the fuel tank filler neck connects to the tank with a rubber hose. Thats on the side where you put the gas in.

yes very very possible the fuel lines probably are very rusty and/or brittle and when disturbed to replace pump can develop a leak also any connections where the lines hook to tank can leak or could be top seal on tank where pump goes into tank(top seal usually only leak on a full or near full tank)

the pressure in the tanks is not enough to "lift" the fuel up to where the seal is on the top. the tanks usually have the fuel pump and level sensor mounted in thru the top. actually if there was a leak anywhere above the fuel level in the tank it would not leak fuel but leak pressure which you would not see. it most likely is a rust thru spot on the tank, it only needs to be a small pin hole for it to leak and it can be very hard to see.