I would recommend finding a good pick-n-pull type of junk yard. With-out a fuel pressure gauge your kind of guessing (should be approx 40 psi ) Here are some things which might make it run rich.
- Air mass meter - Try un-plugging while running and see if it improves
- Temp. sender to computer - located under intake manifold #3 cylinder
- Fuel pressure regulator - try one from junk yard if you have no psi test gauge
- O2 sensor on back of exhaust manifold
If you want to check your fuel pumps, jump fuse #6 to fuse #4, key does not have to be on. You should be able to here both pumps run. The main pump under car should be easy to hear. Much harder to hear is the in-tank transfer pump. You can try to hear it by opening fuel tank door and putting your ear up to fill pipe. Or, if a sedan remove trunk carpet and you find a 6" square plate with two sets of wires going to it. Remove plate and listen to top of fuel tank with a wooden dowel up to ear. If its a wagon you will have to remove rear floor to find this plate.
My son had a 240 that got a fuel relay wet. Its either the windshield wiper seal or sealant around windshield. If you don't find the leak, at least move the relay location.