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Old 08-06-2005, 12:13 PM
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Engine dies after letting off gas

Ok more trouble with my freshly rebuilt carb. Autolite 2100. I posted earlier that I had gas shooting out the vent tube, that is all taken care of. Now when I start the engine it will die as soon as I let off the gas, float is set about 15/32nds. If I pull the airhorn off after running it the bowl is empty. My neighbor suggested I could have a leak around the air horn causing the fuel to run out through the jets. The battery is on charge right now before I go try to start it again, Im open to any suggestions. Thanks

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Old 08-06-2005, 08:31 PM
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Dude,this is the most simple carby ever made.You can actually see it running with no top!Just remove the center stud and the screws,remove the top,start the engine and you will be able to see if the float/needle is the culprit.If the fuel pump is ok,all you have to do is tap the float down a little.It should squirt immediately.Be careful and use a face mask.If you press on the needle side the fuel flow will stop and you can see the fuel level going down.
Research.
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Old 08-07-2005, 10:04 PM
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Quote:
Originally Posted by paulo
Dude,this is the most simple carby ever made.You can actually see it running with no top!Just remove the center stud and the screws,remove the top,start the engine and you will be able to see if the float/needle is the culprit.If the fuel pump is ok,all you have to do is tap the float down a little.It should squirt immediately.Be careful and use a face mask.If you press on the needle side the fuel flow will stop and you can see the fuel level going down.
Research.
Tried again today and no luck, filled the bowl up with gas, engine still will die unless i keep my foot on it, any ideas? its the first carb I've messed with so maybe I overlooked something?
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Old 08-08-2005, 08:02 PM
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Ok.Here we go.Every carby has 6 circuits:

1) Choke
2) Idle
3) Transition
4) Main
5) Power valve
6) Acceleration pump

If you say that it will run by keeping some throttle opening,you lost the idle circuit and possibly the transition circuit too.Remove the central screw that holds the boosters and give a good air blow into the tiny holes at the lowest portion of the tubes.Also remove the idle mixture screws,air blow them,reinstall them all the way in,turn out about 3 turns.Restart and tell us what followed.Good luck dude.
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Old 08-08-2005, 08:14 PM
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if your bowl keeps runnin dry then it sounds like your using more fuel then what the pump can deliver. take the fuel line off the carb and crank the motor and see how much fuel is sprays out. it should be a good amount if the pump it working properly and there should be like 5 - 9 PSI. check that and see what happens.
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Old 08-08-2005, 08:19 PM
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I got to thinking about this and searched for an old post I had before I rebuild the carb and Kultulz and Johnsongrass had suggested a cracked fuel bowl...turns out they were right. I'm replacing it with a new 500cfm holley. Thanks to everyone who helped out with my newb questions.
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Old 08-09-2005, 08:08 AM
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Quote:
Originally Posted by paulo
Ok.Here we go.Every carby has 6 circuits:

1) Choke
2) Idle
3) Transition
4) Main
5) Power valve
6) Acceleration pump

If you say that it will run by keeping some throttle opening,you lost the idle circuit and possibly the transition circuit too.Remove the central screw that holds the boosters and give a good air blow into the tiny holes at the lowest portion of the tubes.Also remove the idle mixture screws,air blow them,reinstall them all the way in,turn out about 3 turns.Restart and tell us what followed.Good luck dude.
Seven. You forgot float circut, lol .
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