1992 Ford F250 - fuel injected motor - running too rich

Black smoke is due to a rich fuel mixture, Check first to make sure you have a clean air filter. If you have a MAF Sensor or an O2 sensor going or gone it will tell the computer the wrong information and the computer will adjust accordingly. You can always use a code reader to see what codes you have, A parts store will have one to read a code for you. I have seen more black smoke from a restricted air filter than anything.

the cat converter is a very good possibility
run he fault codes instead of wasting money on guess replacements

to run an engine needs 3 basic things fuel air and spark. you have spark so next step is to see if you are getting fuel to your cylinders i am guessing it is injected so you should check fuel pressure in your fuel rails. if you are gettign fuel then last thing would be air but is highly unlikely i would say no fuel

Bad fuel pump. Replace and/or check auto cut off for pump. Please note fuel pumps (electric) for injection systems are almost always in the fuel tank.

i don't know man my 1992 ford f250 460 is doing the same thing. it is running way to rich and bearly idles .

Sounds like the injector pump is putting out too much fuel, i.e a overly rich condition. Could also be leaking causing it to be flooding while it is sitting.

can b a few problems check fuel pressure /fuel filter and or fuel pump/ check egr valve /test either clean repair,replace/check carb-throttle body clean repair/check cat converter possible clogging

you may have a bad fuel pump or a bad injection pump,here are picture of the two, as far as the gauge you may have a bad fuel sending unit, this is in the tank and work like a toilet float and sends a signal to the gauge, the injection pump and fuel pump are located on top of motor you would need to have the preasure checked on both before just replace them hope this is helpful.

float is not adjusted right or pressure regulator is bad. berrydalewolf

use the air and gas flow adjustments on the side of the carburator to adjust the rich/lean flow of gas. there is a srew on each side of the carb to adjust one is for air the other for fuel. the one on the driversside is for the fuel and the one on the passenger side is for air. you have to turn them slowly til you get the desired results