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hmmm sounds like the fuel pump is more of the issue as its sending too much fuel into the motor making it run rich or the gas that your using is too rich for the motor itself
Check coolant temp sensor. They fail quite often and will make engine run as if the choke is on, thus killing gas mileage and perhaps running poorly. Other possibles are clogged converter or muffler.
try changing fuel filter and making sure tire pressure is correct keep your car clean so air can flow freely and try an oil change all these factor into good gas mileage and you could try adding new plug wires to your tune up
black smoke is coming from exhaust possible causes--- excess fuel enters cylinders and does not burn completely. poor fuel milage is also a common complaint, when black smoke comes out tailpipe its running to rich!! This can be caused by anything from a computer malfunction to a leaking fuel injector.
A possible fix would possibly be a tune up or carburetor/fuel injection work. run some good injector cleaner in it, it may fix the problem. but if not check it out further. good-day !!
LOOKS LIKE YOU NEED AN O2 SENSOR I'LL BET YOUR GAS MILAGE SUCS TOO O2 IS LOVCATED IN YOUR EXAUST RIGT PAST THE MANIFOLD THAT IS BOLTED TO YOU ENGINE ITS COMMING RIGHT OUT THE EXAUST PIPE SIDE REPLACE THAT AND IT SHOULD TAKE CARE OR YOUR BLACK SMOKE
black smoke is the vehicle is running rich, to much fuel. excess fuel enters the cylinder and does not burn completely. poor fuel milage is also a common complaint when black smoke comes out tailpipe. ( its running rich ). have a good day !
Gas milage will vary, depending on the manner in which you drive, also poor gas milage could be due to poor maintenance. Replace the PCV valve, the oxygen sensors, the fuel filter, plugs and wires, and have the injectors cleaned, switch to synthetic oil should improve the milage. .
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