I rebuilt (no mods) the carb earlier this year. Cleaned everything up, fixed all the linkages, and installed an electric choke. I cannot leave it sit for more than a few hours before the bowl drains out. Also, if I punch the throttle, it gives an initial hesitation but then accelerates fine. When the bowl is full, the accelerator pump squirts fuel no problem. I have tried each adjustment on the accelerator pump arm, no changes. The most likely cause for bowl leaking is a broken valve in the fuel filter? Where can I get a good replacement? I'm stumped on the hesitation issue, other than air somehow getting sucked into the accelerator pump (it is a new pump). The engine is in a pickup, has a new fuel pump. I used an edlebrock 650cfm while fixing up the Qjet, and it ran/started fine other than being gutless, so I think it's not a fuel supply issue.
the plugs in the bottom of the fuel well tend to leak. sometimes they can be bad. Epoxy can cure it. Best bet is to pull the plugs, thread the holes, and epoxy some custom screws in there. Gessler also sells some o-ring plugs for down there that work well at www.quadrajetparts.com As for the hesitation, there are lots of possible causes. The accellerator pump has that checkball in its circuit so it wont drain back. If its working right, you see fuel from the nozzles the instant the throttle moves. If not, reseat the checkball with a punch. vacuum leaks will give you a hesitation then go by leaning the mix. too lean an idle mix can give the hesitate then go. check your vacuum and idle mix settings. if its a WOT thing, then it can be too fast a release time on the primary pulloff resulting in a bog then go just some things to check off the top of my head
Very few modern epoxies are fuel resistent. JB Weld is a complete waste of time/funds, as is "dabbing" epoxy over leaking plugs. We remove leaking plugs here, and tap the castings for screw in plugs coated with Marine Tex. It is a permanent repair. Dabbing epoxy over leaking plugs, is similiar to cutting your arm off and putting a bandaide on it. We get a LOT of carbs in here with the "O" ring repair on the rear plugs. The "O" rings "rot" out over time, but that repair works much better than dabbing any sort of glue over the plugs......Cliff
