I had this problem several times, with a corresponding number of causes. The first was float drop, it was set so the float would actually rest on the bottom of the bowl, and when the fuel would evaporate it would become sticky and the float would stick to the bottom for a while, causing the same symptoms you indicated (mostly) then after the bowl filled, it eventually dissolved the GOO and started working OK. I have had 2 little itty bitty pieces of gunk stuck in the needle valve also causing the same symptoms. (here again, mostly) Then of course was the couple of times there was no reason whatsoever. And everything mostly just healed up evidently. The carburetors aren't sealed on top, there is a hole where the accelerator pump linkage passes through which is mostly where fuel runs out when it has unimpeded filling. I spent the better part of 3 months trying to figure out why my truck was running so poorly, new everything, gas tank, lines pump, filters, 3 different carburetors, points, condenser, plugs, wires, I tried pertronix,everything. Nothing helped, then one day it just started running like the good old days, and has ever since. Never did figure it out.

Last edited by brokenhead; 12/16/2014 4:14 AM.