[djdsc]

Remember the old adage, “Most carburetion problems aren’t.”

Having said that, if you are running a clear plastic fuel filter ether before of after the mechanical fuel pump you will seldom ever see any fuel in it. At times like right after shut down it might appear to be full but running it will not.

Weber’s are sensitive to fuel pressure; if you are running greater than 3 psi then you run the potential of overpowering the needle valve. Unless your floats are set up terribly low and if you have fuel coming out the pump jets when pumped you most likely have enough fuel in the bowls for running. Did you simply remove the fuel line from the output side of the pump and see the discharge. There is no need to install an electric fuel pump on these cars; spend the same money on a rebuild kit for the mechanical if you need to. Running both is not a recommended procedure unless you are only using the electric for priming the lines and certainly not without an automatic shut off in the case of an accident.

It sounds like you are running Weber’s, a point not clearly mentioned. There are three, now four with the EMPI’s, versions of the Weber 40 IDF carbs. Each have their own characteristics, especially at transition which is where it sounds like you are having your problems. The early style 40IDF’s have the most problems very much like what you describe. You must have your accelerator pump set correctly both in volume and duration on any model Weber or any carb on these cars for that matter. What size air corrector, just curious?