After pumping the gas alot my truck starts and then shuts off

change your fuel pump relay.

check the wires on the feed to the fuel pump ,,also check that it hasnt got the cut out thingy on top of the fuel tank like the ford explorer,unless this is only fitted on the europeon models .?

When you get a rebuilt carb you have no idea what the
applications are for

I suggest you rebuild your own,
that way you have all the settings
& experience when your done

I think the float needs to be set correctly
& maybe the pump if there is anything for that
external

You have to have some knowledge about basic
adjustments of air idle screws

Start about one turn out from seated & then use a
vacuum gauge to get the highest reading & then go in
a 1/4 turn
Can use a tach also or both,then reset the timing

I would have all 3 on motor at once

When done you set the idle screw with air cleaner on

IT is a Holley 4-barrel carburaetor that he's reffering to.

Your fuel pump is going out

A 84 should still be carburated. And someone could have added a filter between the gas tank and fuel pump or between the pump and the carb. If not there should have a screw in filter where the line comes into the carb.

Electric fuel pump most likely has too much pressure for the carb. AFAIK, the Holley 4150/60 & 4165/75 should each demand the usual 4.7-5.3 PSI (4.7 @ idle, 5.3 @ max RPMs), so even the Holley red pump would need some restriction from a regulator. If you want this to be adjusted to its best efficiency, you need to have a fuel pressure gauge installed temporarily, if not on the regulator like I have on my Scout II. FWIW, the regulator I have installed is the Mallory 4307M from CenturyPerformance.com, Summitracing.com, Jegs.com, etc.

http://www.malloryperformance.com/pdf/4307M.pdf

A bad Needle & Seat will do this also, or debris stuck between the Needle and the Seat. This is where light tapping on the bowl helps, but it's best to run the fuel out of the bowl a few times and then the volume flow, or quick filling of the bowl, should loosen up the debris.

You also could have set he fuel float too high. What model carb, the ones I mentioned above (AKA Holley Modular Carbs)? If so, then Holley's site has a tech center & instructions on setting the float(s). www.holley.com

Set the floats carefully and slowly/gradually. Make sure the lock screw is always loose enough before turning the adjustment nut. If you strip out the bowl's threads on an older carb, you'll beat hell finding a replacement. 1/12 turn = 1/32" of fuel height IIRC. You set the fuel level, with pump running (wrap a rag around the carb so gas doesn't leak onto the manifold!!!) so the fuel is just starting to dip out of the "peep-hole" in the side of the float. Removal of the peep/seep-hole screw/plug is necessary first. Clockwise rotation of the nut lowers fuel level IIRC and counter raises fuel level. Again, please check their website. Most people get discouraged when dealing with the Holley Modular Carbs, but they are the simplest and the best carbs on the market. Even if 30+ years old.

Check the two screws / pins on the side connected to the air / gas flow levers. The screws go into and out of the carb and / or rods itself. Just play with it and hope you didn't leave anything out!

I assume that your Holley is a similar age as the truck. If so I have a Holley book that I can dig out and let you know for sure, but there should be a large brass screw on the side of the float bowls. Gas should just run out of that screw hole, I believe. Floats that were too high could put gas into your oil.I'd need the model number to look it up.

Check for timing gear problems. They have plastic teeth on the cam shaft gear which will shatter causing it to jump time.