RAT
Member
- 40
- 13
- 8
- Location
- Marietta, GA
What has happened with this?
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Any news, find a fix for this?
I agree, symptoms point to an overly rich mixture. Ethanol gas is a solvent, and dissolves old gums and crud in the tank and fuel system. It is possible some junk got into pressure regulator and it does not work right. I would not take it apart unless it is known bad. Install the pressure gauge as I recommended and lets see.About a month later it stalled while driving and was obviously flooded.
It's very apparent that it is over fueling. Even at about 2000rpm it loads up bad enough to have singular exhaust backfires about every 20 seconds. I'm guessing it's due to excessive fuel making its way into the exhaust and puddling, then firing off.
I ran the electric pump with the top off the carb to verify that the fuel pressure was not pushing past the needle and seat, and to verify fuel level in the bowl. No seat leakage and the level looked ok. Not sure what the actual liquid level measurement is, but its lower than the 5/32" of the float top. The floats do not sink, or touch the edges of the bowl. I did not try the hot water method, but will do so.
What is weird, is that the truck starts fine when cold. A inch or so of choke, a little throttle upon engine coming to life and reduce choke fairly quickly. I'm in TX so its about 50F to 70f in the mornings now. Runs smooth and feels perky to throttle response for about 20-30 seconds, then starts flooding. I can keep it running for about another minute, but its loaded up, backfiring, so I shut it down to be easy on the old thing.
I've checked the proper ball size and location, spring placement and metering rod movements countless times. I've never gone into the governor of the carb. Anything in there I should worry about?
The fuel is local pump gas premium with ethanol treatment. I have drained the fuel and filled it with current fresh fuel.
I don't believe fuel should be running out the pcv nipple when I pull off the cap after it runs for a minute (engine off).
I will install a fuel pressure gauge and verify the regulator, just so it is known.
Thanks for the help
I'm no SAE mechanic, and I didn't go back and reread the entire thread, but the backfiring sounds like it could be a bad Condenser in the distributor......I have checked the 24v feed wire from the fender thru the dist housing to coil for shorts/grounding, have rechecked the points way too many times and always set to .020" I also went down to .017" to see if it helped low speed operation, but put them back at .020" due to no change. It's very apparent that it is over fueling. Even at about 2000rpm it loads up bad enough to have singular exhaust backfires about every 20 seconds.
......What is weird, is that the truck starts fine when cold. A inch or so of choke, a little throttle upon engine coming to life and reduce choke fairly quickly.
......Runs smooth and feels perky to throttle response for about 20-30 seconds.................I can keep it running for about another minute, but its loaded up, backfiring, so I shut it down to be easy on the old thing.
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