My 71 C10 inline 6 has the factory monojet carb and is weeping gas after startup. Appears the gas is leaking from the pivot plate assembly for the accelerator pump. Does not happen until the truck is running for about 10 seconds...interestingly enough, the truck idles well and has some throttle response while weeping significantly. I though the float/needle were sticking.
I reset the float level a bit lower after cleaning the needle/seat and set it too low and not enough fuel to run more than a second or so. Reset to spec. After I separated the carb top from the float bowl assembly and removed the in between gasket I checked the accelerator pump on the bench it pushes gas out of the top of the float bowl assembly where the ball/spring/T seat for pump discharge. That opening is normally covered with the gasket between float bowl and carb top when put together and no evidence of leaking gas from there.
I presume the gas from the filled up float bowl is spilling over or something is blocked. Does the metering rod or idle tube relate to this type of condition? A rebuild is gonna happen but I sure like having some idea of problem before throwing stuff at it. It idles during the weeping...obviously not for long as I quickly shut it off as it"s raw gas on the manifold. Any ideas on the possible issue? And its been 30 years since I rebuilt a carb...:-) Thanks
