CJ-7, 4.2L. Ran Out of Gas and Now Won't Run?!?!... - JeepForum.com
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Unread 01-27-2013, 04:34 PM   #1
dvzant
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CJ-7, 4.2L. Ran Out of Gas and Now Won't Run?!?!...

I have a 1982 CJ7 with a 4.2L and a Carter carb. To top it off I'm in California and have to deal with the smog stuff.

After a LONG battle with the vacuum lines and electronics I finally had everything running well and was LITERALLY driving to the smog check place. I made it about a mile and it started sputtering. I was able to make it back home and found that it ran out of gas.

The Jeep will start and stay running if I continue to pump the pedal. As soon as it gets below 2500 RPM (give or take (no tach)) it bogs and dies unless I pump the gas pedal. The weird thing is that if I spray starting fluid into the carb it will continue to run at somewhat normal idle.

I've put fuel in the tank. I've checked the carb and it is squirting fuel with I push the gas. I replaced the fuel filter and the spark plugs but nothing seems to help.

Does anyone have any ideas? I'm doing everything I can to keep from throwing wrenches.

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Unread 01-27-2013, 05:06 PM   #2
86cj74.2L
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Check your idle tubes.

Their in the Venturi cluster. The first picture is the Venturi cluster looking at it from the bottom.

The second picture are the emulsion tubes that get clogged with dirt. Run a stiff wire threw them and make sure carb cleaner shoots through them
image-1346602295.jpg   image-1301200404.jpg  
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Unread 01-27-2013, 06:47 PM   #3
dvzant
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I pulled those out and cleaned them out as suggested.... nope. Any other possibilities?
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Unread 01-27-2013, 06:54 PM   #4
skizriz
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What fuel filter did you put on it?
I put a Fram on mine once and it wouldn't run with it. Switched back to a NAPA Gold, and everything was fine.
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Unread 01-27-2013, 07:07 PM   #5
dvzant
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For the fuel filter I bought a universal one at Autozone. It was the same thing that was on there already. I'm assuming it's a universal filter.
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Unread 01-27-2013, 07:12 PM   #6
86cj74.2L
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Quote:
Originally Posted by dvzant
For the fuel filter I bought a universal one at Autozone. It was the same thing that was on there already. I'm assuming it's a universal filter.
You should have the factory 3 port filter.

You may need to pull the needle and seat and look for dirt.
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Unread 01-27-2013, 07:20 PM   #7
dvzant
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Quote:
Originally Posted by 86cj74.2L View Post
You should have the factory 3 port filter.

You may need to pull the needle and seat and look for dirt.

The filter is the three port; on in, two out.

For the carb... I removed the top half of the carb to get the venturis out but I didn't remove any of the floats or anything like that. I was hoping to avoid it but I might remove the whole carb and tear it down tomorrow. The frustrating (and confusing) things is that I just had the carb rebuilt by someone that knows more than me.
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Unread 01-27-2013, 07:29 PM   #8
Eric_B_1984
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Quote:
Originally Posted by dvzant View Post
The filter is the three port; on in, two out.

For the carb... I removed the top half of the carb to get the venturis out but I didn't remove any of the floats or anything like that. I was hoping to avoid it but I might remove the whole carb and tear it down tomorrow. The frustrating (and confusing) things is that I just had the carb rebuilt by someone that knows more than me.
With my Grand Wagoneer with the same filter, I was driven COMPLETELY insane for 3 months. A mechanic actually had it for almost 2 weeks to no avail. The 3rd port has to be up, and the filter needs to be as level as possible. If the return line is down, the fuel pump, pumps right back into the tank.
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Unread 01-27-2013, 07:42 PM   #9
dvzant
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Quote:
Originally Posted by Eric_B_1984 View Post
With my Grand Wagoneer with the same filter, I was driven COMPLETELY insane for 3 months. A mechanic actually had it for almost 2 weeks to no avail. The 3rd port has to be up, and the filter needs to be as level as possible. If the return line is down, the fuel pump, pumps right back into the tank.
Yes, I already went through that one early in my project. I do have the return port (3rd port) up.
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Unread 01-27-2013, 07:57 PM   #10
Eric_B_1984
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Hey, figured I would offer that. After 3 months, multiple mechanics going "I dunno" I posted similar symptoms on here, and had it fixed in under an hour.
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Unread 01-27-2013, 08:06 PM   #11
86cj74.2L
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When you had the top of the carb off was their gas in the float bowl?
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Unread 01-27-2013, 08:08 PM   #12
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Quote:
Originally Posted by 86cj74.2L View Post
When you had the top of the carb off was their gas in the float bowl?
Took the words right out of my mouth!
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Unread 01-27-2013, 08:09 PM   #13
86cj74.2L
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Look for a post called "2/3 carb" or something close to that. John ran his BBD with the top off and you can see the proper float height.
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Unread 01-27-2013, 08:09 PM   #14
86cj74.2L
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Quote:
Originally Posted by pman

Took the words right out of my mouth!
Did I taste beer?
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Unread 01-27-2013, 08:22 PM   #15
dvzant
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Quote:
Originally Posted by 86cj74.2L View Post
Look for a post called "2/3 carb" or something close to that. John ran his BBD with the top off and you can see the proper float height.
I searched for that post and couldn't find it...

Quote:
Originally Posted by 86cj74.2L View Post
When you had the top of the carb off was their gas in the float bowl?
There was gas in the float bowl. I don't know enough to say weather or not the float height is correct but the fact that it was running fine before would suggest that the float was fine.


PS - Thanks for all the advice/suggestions... Keep them coming. I'll probably end up with the carb off tomorrow so any and all pointers are appreciated.
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