Quadrajet Problem Solving > Dialing in your rebuilt Quadrajet carburetor
Asking for Setup Help Please
Cliff Ruggles:
The threads are 7/8"-20 on the pre-1972 units. The fitting should seal tight and clamp the gasket well unless a heli-coil has been installed. In that case you loose some of the sealing surface.
Not familiar with the TCS system on that vehicle.
Your carb will have both ported and manifold vacuum sources for the advance. I use ported here for most early set-ups........Cliff
Shiny:
Installed idle tube to .037 and DCR to.055, but found it flooding so jury is still out on the idle system.
Got the inlet to seal with a brass fitting and aluminum gasket, but it had to be tight!
Per Cliff's suggestion on PY forum, I checked compression and it was OK.
While cranking without spark for compression, it was obvious the carb was dumping gas.
Measured fuel pressure. Mechanical pump is pulsing between 4 and 7 psi. Is this OK?
I then checked fuel inlet with a MityVac, carb upside down, and confirmed the float was stuck open. This was not expected with a new needle and seat.
I don't know why the float stuck, was nothing obvious inside. I widened the two steel arms on the float, thinking they may have been binding. Is there any mechanical or interference reason the float would bind up?
There was no debris in the seat nor in the carb, so I'm baffled. At least I'll know what to look for if it starts flooding again.
Navigation
[0] Message Index
[*] Previous page
Go to full version