Mitsubishi Eclipse gas tank, location of

if raining 100% normal. (rag top or hard top,?)
if the HVAC condensate drain PORT under car leaks pure water again 100 % normal. on AC or defrost modes, just like a beer can is wet .
same physics,(condensation)

if water is not water but is Green Coolant that is engine leaks.hoses, or RAD or over filled recover bottle. or
top of engine V gasket front ;rear leaks or coolant pump.
bad thermostat housing leaks too or wrong inside it gasket.
or heater core to right passenger floor well, core is bad.
my 08 jeep (rag) has no body drains for rag rain failures.
but the front cowl vents do. (so as not to food out HVAC air induction ports)
but not told what water means to you?
rain
condensate.
or engine coolant.

doors leaking rain water is huge topic, (seals)

There is a purge valve and solenoid on most cars I believe. The purge valve is usally located by the engine and the selenoid is usally located by the fuel tank. Call up or go visit your dealer and you will be able to order the parts from them and they can tell you the exact location.

Your fuel pump is located inside the gas tank.

Fuel pump is inside the gas tank,relay is engine compartment fuse block,look under fuse block cover to locate which relay it is

Take a freind with you to a car wash,this may help you locate the leak .

your top is leaking,check the weather strip seals to see if any are torn or missing-be careful because mitsubishi does not carry all parts for spyder tops anymore-good luck

Under the car are drainvalves in the rockers.
these are small slits with a rubber valve in it, located just before the rear wheel and after the front wheel.
These are stuck, You can open them up by just putting You finger or a screwdriver in there.
I had the same problem, causes water and bad smell in Your car.
This is common by these types of convertibles, and caused by dirt washed in there from rain etc.
No big deal to solve.

Greetz
Gerrit Canada

http://www.onlinefreeebooks.net/automotive-machinery-power-equipment-ebooks/mitsubishi/2006-mitsubishi-eclipse-technical-information-manual-pdf.html

just copy and paste this in youir browser and follow the information till you see the info you need this is the factory service manual for your car it will show you everything down to the last nut hope this helps. Be sure to rate the answer so other people can find the info.

check the clamps and rubber lines that connect the filler neck to the gas tank. you can see from the wheel well.

It may be a leaky heater core or clogged evaporator pan.