The Stovebolt Site Forums The Shop Area Engine Shop 261 surging under torque maybe carburetor

Hi everyone. i am having an issue with my 62 surging under torque, I thought that it was an electrical break down in the distributor so i changed the points and condensor, and adjusted them, i grounded the distributor to the block and soldiered new terminals to the wires attaching the coil to the dist. ect.ect.
It seemed to run better for a while but now its is back

i rebuilt the carb 9 months ago with a new carb kit, rochester b
I am now thinking that it is a fuel issue. i have a glass filter with the copper insert, i checked this out and it is clean. i am thinking that now its one of two things, 1. fuel pressure from pump to high, or 2. float level. i am having another issue with the carb i should mention, hot start ups after sitting for a few minutes results in floaded conditions, i allow it to sit and she starts right up.

in cold mornings it seem to run without the surging, but today it was 91 outside and i tried to pull up a hill under torque and it was bucking, i had rpms in the power curve. i dont know whats wrong, i bought another rebuild kit and a gallon of some carb soak parts cleaner and i will try and rebuild it again, this time i will check fuel float level, i dont know what it should be, the carb kit came with a guage to use for this but no instructions, and also i will try a fuel pressure regulator, i notice the level of gas in the fuel filter is topped out, the fuel filter bowl is half full sometimes except when i drive it for a few mintes under any torque.

if anyone has any input i would love to hear it.

Did you change the coil or spark plug wires? Either of those will cause that, or a lean mixture from the carb.

i say too rich. it was cold in the morning = dense air
hot in the day = ... not as dense air = rich mixture.

Read the plugs. Pull a couple plugs out & see if they are carboned up. I think you are loading up & compounding the problem with carboned up plugs. Pull the carb & make shure there is a passage way from the vacuum hole in the bottom to the intake manifold. Pull the top off & the float. Shake the float to make shure there is no gas in it. Clean the needle & seat. Make shure the power piston goes up & down & knocks the ball off it's seat. The float level the same on all model B carb,s & i think it's 1 5/32 but i,m not shure. Some other bolters will help out with that.

Twice this happened to me. The first was with an old Toyota 4x4. I changed the fuel filter and it was cured. You said the filter was good so you might have a block in the line or problems in the carb like wrenchbender said. The other time was with my Chevy Tahoe. One of the spark plugs (brand new) had a crack in the insulation and fired intermittently. It took me 2 weeks before I caught a glimpse of an arc flash when it was getting dark outside. Good thing I did, because I was about to blow a few hundred bucks on a new distributer and wires.

Good luck.