Serious oil leak on 2002 mitsubishi eclipse

On the 2002 Mitsubishi Eclipse the fuel pump access panel is under the rear seat. You pop it up and there is a panel on the passenger side where you can get to the fuel pump.
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Pressure wash the entire engine top and bottom and then check for the source of the leak..

Inside the tank... if not first check under the passenger side towards the rear of the vehicle. Should be just in front of the fuel tank and rear tire, or around the tank. If none of these. Check engine bay firewall passenger side. Not an expert on lancers but these are usual locations.

check all your hoses run vehicle for awhile the inspect hose in this area. look for obvious things next check at the engine to see if a freeze plug is leaking then inspect you heater assembly the core may be leaking I'm leaning toward a hose or shut off valve

check forrtocker cover gasket leaking oil down onto the manifold

Assuming you're talking about the lower oil pan...it's very simple

1. Lift at least the passenger front side of the car using a jack, jack-stand, and blocks on the rear wheels

2. Drain the oil out of the pan by removing the drain plug (just like an oil change)

3. Remove all of the bolts on the outside edge of the oil pan (should be about 11)

4. After all of the bolts have been removed the oil pan is free to come off. It might still be stuck on and a few gentle taps with a rubber mallet with knock it loose. Be aware that there is still some oil inside the pan, so this step will be pretty messy

5. Clean the surface of the engine where the oil pan was mounted against

6. Take your new oil pan and place the gasket around the rim of the pan (if not using a gasket then put liquid gasket around the rim. This is important to ensure the pan doesn't leak)

7. Place the oil pan on the engine and bolt it back on. Start by tightening on bolt, then one as close to 180 degrees across from it. Repeat until all the bolts are tightened.

8. Fill the oil pan with new oil. You may also wish to remove and replace the oil filter.

9. If you used liquid gasket, give it a few hours to set (look at contained for a recommend amount of time to wait). If you used a rubber gasket, you don't need to wait.

10. Start the engine and check for leaks. If you notice any oil leaking from around the seal then turn the engine off, go back to step 2 and then repeat from there on. If you don't see any leaks, you are good to go.

Looks like bypass hose or engine coolant plug just got leak! look at ur coolant reservoir, it might overflowing when ur engine heats up and its dripping towards the engine! Look and search all the hoses in the side of the engine and reservoir! If its the bypass hose, there will be a difficulty in removing and replacing it, but u could fix it! taah!

passengers side carpet sounds like a broken {{ heater-core }} although im not actually there to see oit best way to determine this is to first 2 people one inside the vehicle the other with a garden hose and look for the leak 2nd alternative open your radiator cap and see how much fluid is lost run the heater full there can be also seen running down from inside the passengers side where the heater core is located it will most definitively be 1 of them .

Cold, too...
The A/C drain tube is clogged.
Raise passenger side with jack & support. or use ramps.
There is a tube under the firewall. Use a straighted-out metal coat hanger (corkscrew end) to clean out.

Have a dry towel handy ... your face will get wet.

I personally have a 1995 Eclipse, same design. Fuel filter, depending on if its turbo or not, is either where steven said below your washer fluid reservoir (big plastic container) or behind driver side rear tire. Mine was under the reservoir (most hassle I've gone through to replace something, besides the belts D:) Hope that helps :).