Fuel system problems for 76 chevy

[old school truck dude]

that's probly your problem bud, the pump can't send the excess fuel back to the tank, it can only go to the carb, get one with the return line and ya should be all good

x2 and make sure you get the lines figured out, should be fine

[7387chevynut]

that's probly your problem bud, the pump can't send the excess fuel back to the tank, it can only go to the carb, get one with the return line and ya should be all good

x2 and make sure you get the lines figured out, should be fine

Checked the fuel pump when I was at my woods today...........it does have 3 fuel outlets on it......so thats not the cause.

But I didnt check to see if the lines are hooked up how they should be, obviously the tank to pump line is hooked up since the carb is getting gas, but as to the other 2 lines, not sure on those yet.

[old school truck dude]

The other 2 lines are probably close to the same size, easy enough to get crossed up and cause major problems.. If the charcoal canister is real heavy, its full, saturated, and will need to be drained somehow or replaced.. Hopin we are on the right track with this for ya

[7387chevynut]

The other 2 lines are probably close to the same size, easy enough to get crossed up and cause major problems.. If the charcoal canister is real heavy, its full, saturated, and will need to be drained somehow or replaced.. Hopin we are on the right track with this for ya

Shitt, I never even checked the charcoal canister, forgot all about that,  is there a line running up to it?

[old school truck dude]

Your vent line off the fuel tank should go straight to it. If the canister is full/saturated it makes it be as though the line is plugged off, and youll build pressure in the tank. The line off the canister should go to the carb/intake somewhere if I recall correctly. I got nothin to look at around here to jog my memory 

[Hammerlane]

Your vent line off the fuel tank should go straight to it. If the canister is full/saturated it makes it be as though the line is plugged off, and youll build pressure in the tank. The line off the canister should go to the carb/intake somewhere if I recall correctly. I got nothin to look at around here to jog my memory 

fuel cap vent should eliminate tank pressure.
after running the motor for a while.. open the cap.. do you hear air?  if so your vent is plugged.

fuel pump "could" be the issue however most single line pumps have a relief valve in them to prevent
forced fuel to the carb..
Tank is only a canister to hold fuel.. should'nt be the issue unless your vent is plugged.

quick redneck test, disconnect the fuel line @ the carb and put it in a beer bottle..disconnect the + wire @ distributor (no start)
spin the motor over 3-5 turns.. how much fuel do you have in the bottle.. should be 1/2 - 3/4 full.
fuel coming out of the carb is a bad needle/seat, incorrect float adj, bad gaskets (vacume leak) excess pressure.
all of these will cause the symtoms you describe. backfire (lean condition from vacume leak) stalling (flooding or vacume)
I wouldn't worry about the charcole cannister.. alot like the air pumps installed years ago.. quick fix for emissions.