Another Ahab
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What's great about a good solid thread like this, is that when 50 different people kick-in their own hard-earned 2 cents:Greetings from Canada. Back in the mid '80's we replaced a damaged gasser engine out of one of our old 5 ton wreckers. The rebuilt engine was from Contenental and the tags said everything was new. Once installed, it ran good, but not like it was supposed to. We tried everything to make it run well and searched hi and low for the problem. We finally found the culprit. The Cam shaft had been replaced, but not the gear on the distributor shaft. It was worn just enough to run but not like it should. And under some conditions, like coming off throttle, it would be fine. But under load, it was running like garbage. My 2 cents gentlemen.
I was thinking the same thing, jumped time. How many miles on the motor?Greetings from Canada. Back in the mid '80's we replaced a damaged gasser engine out of one of our old 5 ton wreckers. The rebuilt engine was from Contenental and the tags said everything was new. Once installed, it ran good, but not like it was supposed to. We tried everything to make it run well and searched hi and low for the problem. We finally found the culprit. The Cam shaft had been replaced, but not the gear on the distributor shaft. It was worn just enough to run but not like it should. And under some conditions, like coming off throttle, it would be fine. But under load, it was running like garbage. My 2 cents gentlemen.
The only other way that I can see fuel getting in and the truck still runs with the bowl cover off is:I couldn't let it go. I studied the carb that doesn't work. I looked at the carb manual to see what could possibly make it run rich at idle. I came up with a theory- what if the vacuum passage for the accel pump that passes near the idle passage was drawing fuel from the idle passage into the vacuum passage past the bowl cover gasket.
dressed the top of the bowl with a file, carefully. checked for flatness on the bowl cover. installed a new gasket. thought for sure I was on to it.
Reinstalled the "bad" carb. Started it up, still ran rich at idle. I pulled the bowl cover off while the truck was running. The truck still kept running.
Does anyone have any idea on how gas is getting to the intake with the bowl cover off? The idle passage is completed by the cover pressing the gasket over the bow. I am mystified.