1978 CJ7 304 V8 MC2100 Carb Problems - JeepForum.com
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Unread 11-04-2011, 05:53 PM   #1
CJ7ville
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1978 CJ7 
 
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Location: Louisville, Ky
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1978 CJ7 304 V8 MC2100 Carb Problems

I have a 1978 CJ 7, with a 304 V8. I believe it has a MC2100 Carb, when i started it today it all of the sudden runs like crap, i took the breather off to find after running for ten sec the two large holes on top starting to bubble fuel which then ran down in bowl....flooded it out!!! Is this a stuck float?

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Unread 11-04-2011, 08:10 PM   #2
h2ogun
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2006 TJ Wrangler 
 
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Quote:
Originally Posted by CJ7ville View Post
Is this a stuck float?
That would be my first guess, and I would start there.

That model engine should have a newer carb that should have an overflow line (and not the two holes) that connect to the canister, but it could have been changed. (but should still work fine.)

As well, there is a possibility that the fuel filter just before the carb has been changed. The filter should have one input (from the fuel pump) and two outlets, the large one going to the carb and the smaller is fuel return line (smaller diameter) that goes back to the fuel tank. The fuel filter should be positioned so that the return line is directly above the discharge line. While it is a complete shot inthe dark, that could contribute to the problem.
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Unread 11-08-2011, 10:39 AM   #3
CJ7ville
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Thank You for the great info!
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Unread 11-08-2011, 12:22 PM   #4
CJ5_Fan
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1980 CJ5 
 
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Quote:
Originally Posted by CJ7ville View Post
I have a 1978 CJ 7, with a 304 V8. I believe it has a MC2100 Carb, when i started it today it all of the sudden runs like crap, i took the breather off to find after running for ten sec the two large holes on top starting to bubble fuel which then ran down in bowl....flooded it out!!! Is this a stuck float?
Prior to this incident, did it run correctly? If yes, and you didnt do any mods to it, then I would not worry about having something hooked up incorrctly and would focus on the operation of the carb itself. If no, then you may have issues elsewhere.
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Unread 11-10-2011, 05:17 AM   #5
CJ7ville
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It ended up being stuck float!
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Unread 11-10-2011, 09:29 AM   #6
bigjoe
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1977 CJ7 
 
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Location: New Paltz,NY
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HA! I have the same issue on one of my Jeeps here. Is doing the same thing. Float being stuck was one of my first things to check. But I may have water in my tank as well. Glad your Jeep's back in service.
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