i have an older motorhome with a chevy motor and quadrajet carb. if i let it sit for several days it will not start. i tried pouring a little gas in the carb and it will start fine. does this sound like a classic QJ float bowl leak or perhaps a n internal accelerator pump issue? it does not seem to squirt gas down the venturi when i pump it. but once it starts, the motor runs fine. we changed the fuel filter/strainer on the carb inlet but i wonder if it might be the FP as well.