cvette427

My 3X2 carbs on my 67 are just dumping fuel into the engine. Center carb is good but the engine will barely run till it floods out and then after it shuts down the carbs can be viewed just dumping raw fuel into the engine. Doesn't always happen but it is becoming more common. Float levels are below sight holes but fuel dumping continues. Seems to be fuel pressure left in lines pushing it's way in. Put new fuel pump on last fall and better for a while but now worse than ever. Rebuild kits? Any good sources that don't sell junk? Suggestions?
cvette427

62Jeff

Welcome! Sounds like fuel percolation.

Before you start the car again after this condition, please read this thread
http://forums.corvetteforum.com/c1-a...rcolation.html

cvette427

Looks a lot like the video but this happens after the car has been sitting for weeks without starting and the engine is completely cold on startup. I don't know much about carbs but could the metering block gaskets allow that much leakage as soon as the fuel pump pressurizes the fuel line? The carbs have not been rebuilt in many years to my knowledge.
cvette427

tbarb

The end carburetors have a metering plate not a metering block. This arrangement is like the 4160 Holley 4V used on the 66-67 Corvette engines.

The metering plate warps very easily and should be removed and sanded flat and the main body checked for flatness along with using the correct gaskets for reassembly. This plate has six or so clutch head screws that attach it to the main body and if they are overtightened that can also bend the plate. It's also a good idea to check the main body bottom and throttle body for flatness and install a new gasket.

The Holley modular design works good if all the surfaces are flat but if not they will drive you crazy.