Bogging/stalling when braking

[luvbowties]

Originally Posted by tenni126

Yep. The Edelbrock is maybe an apples to orange kinda thing compared to your specific carb, but that was my problem. It was after I swapped to 4 wheel power discs from manual drums, so the added vacuum load kind of exacerbated things. It used to only kind of stumble on braking, then after the brake booster it'd stall completely. IIRC it was that the fuel level was too high, and when I'd brake what was happening (I think) was that it would flood the carb temporarily. It didn't take much to correct it, and I remember being surprised at how sensitive it was to float height. That advice was from the troubleshooting chart in the carb's manual.

Hey, tenni126. Personally, I don't see apples and oranges here--I see fruit in both cases. Have had that issue w/so many carbs--Holleys included--that I see them all operating basically the same. On one Holley, I knew float height was my issue, but even so I must've opened it up and readjusted it 12-15 times. It was on a '69 Chrysler New Yorker with 20-some thousand miles, 440 engine, & 4bbl Holley. Traded to me by an elderly, wealthy farmer...car looked on outside like it had 220 K miles, where he'd bumped it numerous times, always had dent partly knocked out, & close to correct color paint put back on; on the inside looked brand new! They just couldn't find anybody who could fix the carb problem.

While I was working on it, I finally tossed the carb. specs & began my trial-and-error routine. Found a wee bit of range between its previous flooding-syndrome just prior to stalling, and leaning just prior to stalling. Within that tiny range, it became perfect. It was like you described, float too high would give it too much gas initially as fuel level sloshed over into venturi, then quick braking, and ka-plunk...stall from instantaneous overly rich condition. Then when float was too low, it'd act like bad accel. pump when you began to move off, then when you suddenly hit the brake, ka-plunk again and stall again--this time from being too lean an instant earlier.

Betcha that even a Weber carb could present similar symptoms, & I've never seen inside one of them?!?!
Sam