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calebcj7 09-06-2018 01:03 PM

Jeep CJ7 Dies
 
Hey guys i have a 1977 Cj7 with a 258 under the hood, Trying to get it inspected and on the road. I took it out for a test drive a few days ago and it died coming up a hill shortly after reaching the top. I took it out again today and the same thing happened except it died going up the hill not after the top. For the first test drive i had already been riding it for about 20 minutes, but the second time i had only had it out for about 10 minutes. I was able to coast into my driveway after the first stall. The jeep would crank but not start until i sprayed it with starting fluid then it started right up and ran great. After this i replaced the fuel filter, which i found to not have one, except for a water/gas seperating filter for boats mounted on the fender, so i replaced that.

So today after it died again, i tried to start it without the gas cap on thinking maybe vapor lock, but no luck. The butterfly on the carb was open and when i pumped it i could see gas entering into the carb. I sprayed her with starting fluid and again it started right up and i drove her home.

The jeep is not overheating either, I installed an autometer water temp guage that was sitting pretty at 180 the entire time.

Any suggestions?

walkerhoundvm 09-06-2018 01:15 PM

Sounds like the one thing in common is a hill. Been a long time since I bothered with carbs, but to me this sounds like a carb fuel float +/- fuel pump issue. Possibly a fuel tank/sending unit (pickup) issue. Have you got a full tank of gas? Know anything about the last time the tank was dropped? Most of these are not difficult for the average Jeeper to address, but the carb fuel float might be a little trickier for a novice.

calebcj7 09-06-2018 01:23 PM

The carb was replaced by the PO and is almost in new condition. I drove it to get a full tank of gas on its maiden voyage, so its completely full, and I dropped the tank about 1-2 months ago and replaced the sending unit to fix the fuel guage. It also has a fairly new plastic gas tank in it. Could i have maybe put the sending unit in wrong?

80cj 09-06-2018 02:33 PM

Wonder if it's a carb float level issue. Does it run around on level ground OK?

Goatman#1 09-06-2018 03:41 PM

Float level. Could have a pin hole in it throwing the settings off. Replace all fuel filters. Needle valve has been known to stick. If you can run a hose from the fuel pump at the tank side to a small 2 goal fuel can and strap it to the hood or something you can find out if it could be the pick up in the tank, etc. Is the problem or if the problem is under the hood.

WindKnot 09-06-2018 03:47 PM

New means new. It doesn't mean better or that it works. Check the float.

LumpyGrits 09-06-2018 05:48 PM

How hot is the coil getting?
If you can't keep your hand on it-That could well be the issue.
LG

calebcj7 09-06-2018 07:33 PM

Quote:

Originally Posted by 80cj (Post 40341707)
Wonder if it's a carb float level issue. Does it run around on level ground OK?

yes 80cj it runs great on flat ground, ive only driven it for 20minutes so far though

calebcj7 09-07-2018 08:55 AM

Quote:

Originally Posted by LumpyGrits (Post 40341917)
How hot is the coil getting?
If you can't keep your hand on it-That could well be the issue.
LG

Do i have to wait for it to stall to test this? or could I just run it for a while then touch it?

calebcj7 09-07-2018 08:57 AM

Quote:

Originally Posted by Goatman#1 (Post 40341787)
Float level. Could have a pin hole in it throwing the settings off. Replace all fuel filters. Needle valve has been known to stick. If you can run a hose from the fuel pump at the tank side to a small 2 goal fuel can and strap it to the hood or something you can find out if it could be the pick up in the tank, etc. Is the problem or if the problem is under the hood.

Ok so your saying there could be a hole in the float allowing it to weigh more? and the needle valve could be stuck, is there anything else i should look for when im in there?

walkerhoundvm 09-07-2018 02:53 PM

Quote:

Originally Posted by calebcj7 (Post 40342491)
Ok so your saying there could be a hole in the float allowing it to weigh more? and the needle valve could be stuck, is there anything else i should look for when im in there?

Not sure on the needle valve, again it's been a while, but if there's a hole in the float you basically don't have a float any more. You have a piece of metal with gas in it. Should be pretty obvious when you crack it open - there'll be gas in the little grape-sized float(s).

Spieg8 09-07-2018 08:43 PM

Sounds more like fuel starvation to me. A sinking float will overfill the fuel bowl, and this wont be helped by starter fluid. Check for any leaks in the fuel line between the tank and the fuel pump where you might be sucking air into the line.

Also post up a picture of your fuel filter. Should really only be one filter with 3 hoses connected to it. 1) supply from pump, 2) feed to the carb, 3) a return line back to the tank. The return port will be off center and the filter should be rotated so the return port is at the top or 12:00 position so any air in the filter will go back to tank rather than to the carb (vapor lock prevention).
https://forum.ih8mud.com/attachments...1-jpg.1083898/

LumpyGrits 09-08-2018 06:08 AM

Quote:

Originally Posted by calebcj7 (Post 40342489)
Do i have to wait for it to stall to test this? or could I just run it for a while then touch it?

What for it to die...
LG

calebcj7 09-08-2018 10:10 AM

Quote:

Originally Posted by Spieg8 (Post 40343351)
Sounds more like fuel starvation to me. A sinking float will overfill the fuel bowl, and this wont be helped by starter fluid. Check for any leaks in the fuel line between the tank and the fuel pump where you might be sucking air into the line.

Also post up a picture of your fuel filter. Should really only be one filter with 3 hoses connected to it. 1) supply from pump, 2) feed to the carb, 3) a return line back to the tank. The return port will be off center and the filter should be rotated so the return port is at the top or 12:00 position so any air in the filter will go back to tank rather than to the carb (vapor lock prevention).
https://forum.ih8mud.com/attachments...1-jpg.1083898/

OK ill check for leaks,

I don't have a normal fuel filter in the lines, i have a boat filter for seperating water out of the line, (my jeep used to be a plow rig, guessing because condensation may have been getting in the tank) This filter is between the tank and the fuel pump, and then i have hardline going from the fuel pump to the carb.

But if it had fuel starvation wouldn't it stall even on flat ground? mine seems to die only when going up a big hill by my house.

calebcj7 09-08-2018 10:16 AM

Just measured 9 psi of pressure coming out of the fuel pump, is that too much? Looked like it should be around 4-7psi based on what i saw online.

Spieg8 09-08-2018 05:07 PM

Does sound a little high. That's the other purpose of the 3-port filter excess pressure is released bock to the tank via the return line.

Spieg8 09-08-2018 05:10 PM

Quote:

Originally Posted by calebcj7 (Post 40343781)
But if it had fuel starvation wouldn't it stall even on flat ground? mine seems to die only when going up a big hill by my house.

I assume you are on the the gas pedal more while climbing a hill than you are on flat ground?

LumpyGrits 09-09-2018 03:05 PM

Go back to OEM filter set up and see what happens.
Pull the top of the carb off and check float setting.
LG

layzdude 09-14-2018 04:53 PM

I had the same issue on my 86. When I dropped the fuel tank to replace the sending unit I Pinched the fuel line. I would check ha first. Disconnect the fuel line right before the fuel pump and use a gas can to see if it run directly from there. You an also pinch the vapor return line and it should give it enough fuel to run. I always keep a clamp in the console. Hope that helps.

calebcj7 09-15-2018 10:36 AM

OK guys so sorry about taking so long to get back to you, ive been extremely busy with high school starting back up for me. I found the problem!!!! Turns out that there are two vacuum ports on the carburetor which were capped off, but both of the old rubber caps were cracked and not sealing, so i replaced both of those, and she goes up the hill with ease now!

Thankyou so much for all of your guys' help, and Speig, I am going to convert it back to the oem fuel filter set up like you recommended.


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