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I know it sounds a bit difficult but fuel leaking is serious danger so with this id siphon tank dry (don't use a drill pump ) and undo fasteners and hoses/wires that hold it too truck , lowering it to ground , a carefull inspection of approx. area of leak will tell the problem , your looking for cracks in plastic or rubber hoses , these might be very small and fine look closely
if cracks are in the tank , unless you know someone with a ultrasonic welder id replace the tank
There are normally two hose lines from the fuel filler that run to the tank. The larger one carries the fuel from the nozzle to the tank. The smaller one is a vent hose that allows vapors to leave the top of the tank while filling. These vapors come back to the nozzle area and can be vented and/or collected by the nozzle depending upon air pollution standards in your area. If your second hose is running to the bottom of the quarter panel, it is probably the vent hose that may not have been reconnected at the top of the tank when the fuel pump was replaced. The fuel running down there is from kickback fuel at the time the pump shuts off. The real problem is that the vent line is open on top of the tank and when the tank is full, that can allow vapors and fuel to escape out of there and it could contact hot exhaust areas - a major fire or explosion hazard. Have this inspected and repaired IMMEDIATELY.
"Where" to find the leak is in your evaporative emmissions system. Most of the time, a good visual inspection will turn up the culprit. First, check the fuel cap. Look at the rubber O-Ring that seals it against the fuel fill tube. If it is cracked or looks like it is crushed down, replace your fuel cap. If that all looks OK, then you can check the rest of the system for obvious cracks, or leaks. Start with the Evap Purge line. You can identify this in the engine compartment as a plastic vacuum line about 5/16" in diameter and it has a service port on it with a green cap. Check the plastic line for cracks. Then check the rubber components that connect to this line on both ends. One end will go into the Purge Solenoid and the other will go into a steel line that runs along the frame rail under the vehicle. Follow this steel line to where it goes and inspect all connecting hoses, tanks, etc. there will also be rubber hoses at the fuel tank area and some that connect to the fuel fill tube. Check all of these for any visual signs of damage or leaks. Also check for badly corroded metal parts - especially near the fuel fill tube. Sometimes the metal tubes get rusted through and cause leaks.
If a thorough visual inpection does not lead you to a suspect, then the system will have to be "smoke-tested". This is where the system is filled with smoke under a slight amount of pressure so the leak can be seen where the smoke comes out.
you need to get your car to a car shop so they can put it on a lift to see what is wrong. fuel leak can be very dangerous.
there is a fuel pump gasket on the top of the tank
there is a filler hose goes to the side of the tank
there are a pressure hose and a return hose go to the top of the tank
there are evaporation hoses on top of the tank as well.
rubber hoses are getting old and crack easily
so there are many possibiltities that can cause leak
The oil leak at bottom of radiator could be oil cooler and/or supply hose. Try check closely for wettest area . The other leak could be thermostat cover, it only uses a sealing ring and is prone to leaking after time.