Bone1

did the new tank come with a new cap as well?

Old caps were vented, the new tank might be unvented, simple cap swap to test.

CXyD

if this bogging happened a while after fuel pump replacement did you use fuel with some ethonal?
cheap fuel pumps may have an a crapy diapharm in them and the alcohol will eat it out.
While a higher quality fuel pump with a nitrole diaphram will handle ethonal blended fuel.

Wank.a.lot

ok the carb is cool and the ignition ---- is good too. except for the ground going to the coil. i'm in the process of fixing that, but i wanted to check back with other stuff i found.

there is some kind of metal line going from the carb to the right side exhaust manifold, looks like it goes to the choke.
that line was not connected to the manifold. it looks like some brake line tubing.

also the cap might be a problem, the old cap that was on the car when we got it was broke so we bought a replacement locking cap from vatozone. it looks like it has some kind of venting setup, but when i take off the gas cap it relieves a ton of pressure. should i stick a rag in the tank instead of the cap and see if that fixes the problem?

92CXyD the only gas that has been in the car since we got it is chevron 87.

i'm going out right now to re connect the ground to the coil and make sure that line is in the manifold. then drive it around the block and see if that fixes it.
bone get back to me on the gas cap. i don't have an og one, just the new one i bought. would a rag in the tank let me know if it's the cap?

CXyD

not safe to have a rag in tank that would be like an invitation to a molatave cocktail party in your honor.



just kidding


try with the cap on but lose enough to have ventilation but not fall off.

94snatch

I had this exact problem with a 61 falcon. When it was running at low throttle it was totally fine when it idled it was fine. when you opened it up it would start to go then cough and sputter. This was only after i did a tune up? Turned out to be the new shitty fuel filter. Change it with another cheapy and try. Check to make sure your line is not crimped anywhere or mashed with the hose clamp especially at the fuel filter inlets. Sounds stupid but it had me running in circles looking for something more complicated for 2 days.

Wank.a.lot

94 ******: nothing sounds stupid at this point. the pump and filter are one piece. well kinda.
if nothing else works i'll try that. it's only $3.99 for a new one at vatozone, but i don't have a car to get there right now.

CXyD

if you have the cartridge type filter in the pump you can spin open the bottom of the pump and replace the filter should be a cg20 from fram.

Wank.a.lot

yeah it's $3.99 at vatozone, but i don't have a way to get there.

ok so i tried leaving the cap off a little
didn't fix it.

i tried fixing the wire to the coil
didn't fix it.

put the metal hose back into the exhaust manifold
didn't fix it.

only thing i can't try is the fuel filter, i'm gonna take it out and look at it though.

oh and there is a little bit of crushed fuel line between the pump and the carb, but it was there before all this so i'm not sure if that is the problem or not. i'm gonna try to fix it anyway, but i'm still looking for ideas guys.
could it be something to do with the tranny? i tried it in low and in drive and both had the problem. if i gas it in park or neutral it revs up no problem

jinxy

check your plugs and throw some more timing at it

bitchM0VE

T a fuel line off the carb and run it to a cheap-o fuel pressure guage. They got inline ones for like 10 bucks at autozone that go to ~10 PSI. Just plug one end of it. See what your base pressure is at idle and see if it drops off at cruise, WOT, etc. That will tell you if the problem's fuel and if it's the carb or the system feeding it. I'm sure it had a mechanical pump before. Did you replace it with an electric? Perhaps with the diaghram POS autozone universal pump that's rated at 341 drops/hour @ 0 PSI? I'm betting this is a fuel pump problem.