| Testing of gas versus spark versus vacuum [message #279290] |
Sun, 07 June 2015 18:12  |
budworks521
Messages: 137
Registered: October 2013
Location: Grand Rapids MI 1974 Pain...
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Gentlemen, since I am not a very great mechanic I took to heart many great ideas on solving my riddle(s). I rented a vacuum pump, got a small container of gas, and some gumout and tried different methods of analysis. First I tried adding air or vacuum with the pump to see if my vacuum was the problem of stalling and it didn't help. I had a steady 17 inches or so from two ports front and back of carb. Secondly, I decided to add a few squirts of gas tear drop style when it started to bog down and viola the engine wanted to run again. I already changed the module with no difference in running better. Hence, this is what I noticed. First, my float bowl is empty upon starting. No squirts when a cold throttle takes place. It is either draining out of the bowl or something else. My carb no longer floods either. Secondly, Once it starts running it will idle for some time until the carb rids itself of gas or ???. Maybe by me pumping the gas to get it to idle fills the bowl enough and then the gas eventually runs out? My fuel line before the mechanical pump used to twitch quite abit and now you can hardly feel the gas pulsating through the line. So I pretty much know that my problem is lack of gas to engine. The carb has been looked at and rebuilt three times, no idea what my fuel pressure is, and whether or not my float needle is hanging up or stuck. I wonder how long can an engine run with with gas initially in the bowl and then not refilling properly??? Thanks for all the insight.
1974 Painted Desert
455 upper half rebuild
constant project inexperienced mechanic
Grand Rapids Mi
Always trying to learn
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