carb 911 help!
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Junior User
Joined: Jan 2011
Posts: 57
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From: Tigard, OR
carb 911 help!
So, being a young naieve teenager, I decided to pullt the carb of my truck today, the motorcraft 2150, and do a rebuild. Seven ungodly hours later I hook it all up and start the truck. It runs for about five seconds, then the whole carb floods and gas comes out of everywhere. Pulled it off and tore it apart again to look through it, put it back on, and the exact same thing happened. Its my daily driver so I kinda need help asap... btw its a 351m on a 79 250... its also a cali truck with all the egr stuff... thanks in advance!
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Junior User
Joined: Jan 2011
Posts: 57
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From: Tigard, OR
Couple things. Which retainer are you referring to? I know I replaced the needle and seat but I'm not sure on the retainer? I'm not lookin at the truck till I get off today, I have to get a ride to work but ill look at it again when I'm off. Another thing I noticed is the throttle cable when fully depresses, only opens up the gap for air on the top a little bit. This normal?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The float pivots on a pin that is held to the seat assembly by a small wire retainer. When you install the float, you must snap this into place. Otherwise there is nothing to keep the float in place and force the leverage action to shut off fuel flow once the float rises to the correct level. It works just like a toilet tank.
Your other question refers to the choke unloader, and yes, this is normal. The plate on the top of the carburetor is the choke plate. When it's closed, if you press the throttle all the way, a small tab on the passenger side of the throttle shaft opens the choke plate slightly. This is to help clear a flooded engine if the choke plate is closed. If you've ever tried to start a flooded engine, you know to press the gas pedal all the way to the floor and turn the key. This does 2 things: it opens the throttle plates to let the engine breathe, and it pushes the choke plate open slightly to let air through via the choke unloader. You're seeing the second thing happen.
Once the engine is warmed up and at operating temperature, the choke plate is open completely, and isn't in the picture anymore. Please refer to this thread:
https://www.ford-trucks.com/forums/8...-answered.html
Your other question refers to the choke unloader, and yes, this is normal. The plate on the top of the carburetor is the choke plate. When it's closed, if you press the throttle all the way, a small tab on the passenger side of the throttle shaft opens the choke plate slightly. This is to help clear a flooded engine if the choke plate is closed. If you've ever tried to start a flooded engine, you know to press the gas pedal all the way to the floor and turn the key. This does 2 things: it opens the throttle plates to let the engine breathe, and it pushes the choke plate open slightly to let air through via the choke unloader. You're seeing the second thing happen.
Once the engine is warmed up and at operating temperature, the choke plate is open completely, and isn't in the picture anymore. Please refer to this thread:
https://www.ford-trucks.com/forums/8...-answered.html
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Junior User
Joined: Jan 2011
Posts: 57
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From: Tigard, OR
Fmc, hats off to you man, I'm not even home from work but I'm a 100% positive I didn't push the rod into place. You have a way with explaining things. Your write up on electric carbs was fantastic. I don't feel nearly as overwhelmed now and confident I can fix it.
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