Second brand new Holley carb flooding?
Hi thanks for the replays. This is the third new carb. The first new carb was a 670 Holley street avenger. It worked great and never flooded. The problem was that it stumbled at take off and I couldn't get it to stop so I sent it back and got the 750 double pump. Both the 750s that have flooded seem to have started it after letting off the gas and the motor winding down. The gas is coming out of the front lil tube that sticks up. I adjusted the float level and looked at the needle of the first 750 and it didn't help. The only reason I went with Holley is that say these things are tested before shipped and ready to bolt on at go. If I can't get get figured out I will never buy another Holley.
Well before you write Holley off, Pay attention to the guys here.
You say "started it after letting off the gas and the motor winding down. The gas is coming out of the front lil tube that sticks up." So I just gotta say; This sounds like fuel slosh to me.
Four-speed cars with plenty of compression, during compression braking at higher rpms can decelerate so hard that the fuel can slosh to the front of the bowl. When this happens the float can fall into the void, and more fuel comes in. Now the bowl has too much fuel in it. Then when you get back on it, the fuel moves to the back, and up the spout.
Now with an automatic, this is less likely to happen, but if you are manually downshifting, it still could.
This is not flooding. The engine may even continue to run pretty good, until the sloshed fuel spills into the carb throats,upon getting back on it.
So if you are driving like this, your bowls may need baffling and/or the float level changed for your style, or just quit doing that, or install a dashpot on the linkage so the butterflies cannot slam shut, or open the butterflies some.
If you are running a lot of idle timing,the butterflies may be too far closed, and that would contribute to the slosh idea. I mention this because from the description of the "bog" with the first carb,(and the possible faulty T-port sync) this seems very likely.
In all honesty and fairness to Holley, 3 faulty carbs in a row seems like incredibly bad luck.