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Old 08-16-2011, 05:16 PM   #1
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Help! not starting, carburetor agjustments?

Hey guys I have an 88' YJ and I've had it for about three years now. It's always died on me every so often and had a hard time starting. But just a couple days ago my jeep wouldn't accelerate over 15 miles with my foot to the floor. When I parked it at home, I leaked a ton of transmission fluid (always leaked, never this bad) so I pulled the transmission pan down and fixed the leak, put fluid in. But when I went to start it yesterday it wouldn't start. Wouldn't even kick over for a second. ( which has never happened in the three years of owning it). So I don't know of there's a certain way I can adjust my air/fuel mixture properly or what?

,Alex

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Old 08-16-2011, 06:11 PM   #2
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The only adjustments you can make to a carburetor without a full rebuild are:
Idle mixture
Choke
Idle speed

If you are not starting, maybe the choke is not closing, but since its not sputtering at all, remove the air cleaner and pull the throttle fully open, while doign this look down into the carb, if you see fuel squirt, check for spark, if no fuel, check your fuel supply.

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Old 08-16-2011, 06:21 PM   #3
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Well I have just under half a tank and I did look down the throttle body and did not see the fuel squirting anywhere. I continued to pump my gas peddle and continued to see nothing I don't know if this is from my carburetor running too lean or my jets are simply not squirting fuel?
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Old 08-16-2011, 06:27 PM   #4
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You have fuel delivery issues. It could be a plugged filter, or a bad pump. If you were to squirt some gas into the intake, or starting fluid, it should start and run for a second or two.
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1995 YJ, moss green with the 2.5/ax5 combo. 124K miles
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Old 08-16-2011, 06:38 PM   #5
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I don't think it's my fuel filter, I replaced it maybe about a year ago and maybe drove it 7 out of the 12 months. Is there something I can do to test for my fuel pump?
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Old 08-16-2011, 06:42 PM   #6
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Remove the line feeding the carb and stick its end into a jar. Crank the engine a bit and it should start to fill the jar. If nothing comes out, you are out of gas or the pump is bad.
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1995 YJ, moss green with the 2.5/ax5 combo. 124K miles
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Old 08-16-2011, 06:59 PM   #7
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Alright I'll give that a try, thanks for the help!
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Old 08-16-2011, 07:18 PM   #8
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Quote:
Originally Posted by Alex801 View Post
Well I have just under half a tank and I did look down the throttle body and did not see the fuel squirting anywhere. I continued to pump my gas peddle and continued to see nothing I don't know if this is from my carburetor running too lean or my jets are simply not squirting fuel?
Yep, as others said, you have either a fuel delivery issue, or your carb accelerator pump is damaged and your engine is not producing enough vacuum during cranking to pull fuel out of the venturi.
Chances are, your not getting fuel, goatman and I both agree, check your fuel pump in the manner he described. If nothing comes out during cranking, dump a gallon of fuel in it (the fuel tank NOT THE CARB), with starter fluid sprayed int he carb (you can use carb clean, but be carefull), crank it and run it a bit to prime the system, if you were out of gas, it will continue running all its own after a few moments, if not, replace the fuel pump and try again...

Normally if its just the pump, it will prime quickly and your done, if your out of gas, your pump might have emptied the fuel line from the tank, and it will take longer to prime.

Good luck, ill check back later.
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Old 08-16-2011, 08:36 PM   #9
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I ran the test and I pulled off my fuel hose just before my fuel filter, and pumped it... Not even a drop. So I was thinking about buying a new fuel pump but I currently have a mechanical fuel pump, would it be wise to upgrade to an electrical fuel pump? I don't know the difference.
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Old 08-16-2011, 09:01 PM   #10
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I would stick with the mechanical pump, just buy a good quality one from a place like NAPA or something. The mechanical ones are much less troublesome in my opinion and much easier and cheaper to replace. I love simplicity of non electronic things.

Also, check the engine oil on the dipstick and smell it for gas odor. Sometimes when mechanical pumps fail, they can dump gas into the engine and dilute the oil.
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1995 YJ, moss green with the 2.5/ax5 combo. 124K miles
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Old 08-16-2011, 09:03 PM   #11
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Alright thanks a ton I'll check it out and reply when it's done. Hopefullm successful.
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Old 08-17-2011, 12:15 AM   #12
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Ok so far it is a success! I bought a new mechanical fuel pump and threw it on. I noticed that my old one had quite a bit of oil in it, I don't know if that is normal or what. But after a few times pumping the gas peddle and trying to turn it over it kicked right over. And so far so good. So thank you so much for your help! Without this forum and the the help I was given my jeep would still be sitting in my driveway. So thanks again for the help! Thank you, thank you, thank you!!
Thanks

,Alex
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Old 08-17-2011, 12:33 AM   #13
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The oil in the pump cavity is normal, but the oil itself had no gas smell? It won't hurt to change the oil as a precaution anyways. Would rather spend $15 on oil than smoke the bearings.
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1995 YJ, moss green with the 2.5/ax5 combo. 124K miles
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Old 08-17-2011, 12:37 AM   #14
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I actually forgot to smell it. I will do so tomorrow. I could use an oil change anyways. but other then that it was running for about five to eight min before I shut it off. Ran great. Now I move on to my crappy carburetor.
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Old 08-17-2011, 01:13 AM   #15
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Quote:
Originally Posted by Alex801 View Post
Ok so far it is a success! I bought a new mechanical fuel pump and threw it on. I noticed that my old one had quite a bit of oil in it, I don't know if that is normal or what. But after a few times pumping the gas peddle and trying to turn it over it kicked right over. And so far so good. So thank you so much for your help! Without this forum and the the help I was given my jeep would still be sitting in my driveway. So thanks again for the help! Thank you, thank you, thank you!!
Thanks

,Alex

Good to hear your driving again! and congrats on a job well done!
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Old 08-17-2011, 01:25 PM   #16
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Now I move on to my crappy carburetor.
I love carburetors lol. Do you have a thread going for it, or what are the problems with it?
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1995 YJ, moss green with the 2.5/ax5 combo. 124K miles
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Old 08-17-2011, 01:55 PM   #17
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I don't have my own thread I've read a couple other threads and kind of joined in. But my problem is that ever since I've had this jeep it has always had a hard time starting. Also I've had many problems with it stalling. The owner before me had a manual choke hooked up to it, I decided to disconnet it and try and hook up the automatic. I think a problem to is that my air/fuel mixture is off. I'm not quite sure what I'm supposed to adjust it to for the right mix. Also I'm having backfires, I think that's from it running too rich. I'm no expert though.

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