Truck Bogging Down Suddenly
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Proper fuel level for a Holley is at the bottom of the site holes. Running the fuel level that high makes the venturi come in sooner. You may still be partially clogged or possibly the gasket is leaking underneath where the venturi bolt in. I have also had the main body warp, so the metering plate gaskets would not seal well. A new kit and everything would be fine until a month or two later and then back to the same thing. I stumbled onto a magazine article where they showed the holleys are bad about warping the main body, the 4 threaded holes for the fuel bowl and metering plate are high, the center ends up low, and the gasket doesn't seal all those little holes like it's supposed to. I had access to a lathe and used a fly cutter to level the main body back out and it fixed it right up. I have tried to file it by hand to make it flat but have had limited success doing that.
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So I adjusted the accel pump arm and drove it some, then I lowered my floats back to the middle of the sight glass and it drove good. Made it about 10 miles then it started wanting to bog at idle in gear. In neutral or park it’s great, soon as it goes in gear it wants to big down but as soon as it gets some throttle it’s fine. Coming to a stop is the same, runs rough once I get to a stop. I tried idling it up but even idled wayyy up it’s the same thing.
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So I adjusted the accel pump arm and drove it some, then I lowered my floats back to the middle of the sight glass and it drove good. Made it about 10 miles then it started wanting to bog at idle in gear. In neutral or park it’s great, soon as it goes in gear it wants to big down but as soon as it gets some throttle it’s fine. Coming to a stop is the same, runs rough once I get to a stop. I tried idling it up but even idled wayyy up it’s the same thing.
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I am wondering if you have a piece of junk clogging one or both main jets. I had a problem where the car would run fine as long as I patted the pedal. This was going down the road and it happened all of a sudden. If I kept steady on the pedal like normal it would start making a loud air noise and it did not want to run very well. As soon as I patted the gas pedal it would leap forward and run ok for a couple of seconds and then back to what it was doing before. I nursed it home and found a piece of rust clogging one of the main jets in the bottom of the bowl.
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So I’ve got her purring like she has a new carb again lol. Turns out one of my carb nuts had rattled loose and wasn’t tightened down all the way causing a gasket leak. In addition, my air bleeds on top of the throat we’re a little loose, although that didn’t seem to be an issue before. Tightened those down though and replaced a couple of questionable vacuum lines as well as cleaning some crud out of my bowls and blowing out the jets did the trick. I added a fuel filter right before the carb in my fuel line as well. Thanks for y’all’s help!
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