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Old 03-12-2012, 11:05 AM   #1
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87 YJ Carb HELP!!!! Please!

OK. So My 87 has been sitting for 2 years and it runs ust fine when you poor gas down the carb. But I'm having issues with gas going through the carb. I rebuilt the carb, but there are still issues. the first issue was gas was not even getting into where the floats are. So I got the needle unstuck and made sure there was gas in the carb. But then gas wasn't shooting through the jets. There are no blockages Ive checked for that and there is gas getting all the way to the carb ust not through it. Should I just buy a new carb or is there a way to fix this. Plenty of gar is getting pumped towards the carb so i dont believe its a tank issue or fuel line. Who ever can help, please help!!!!

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Old 03-12-2012, 07:27 PM   #2
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Probably the accelerator pump.

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Old 03-12-2012, 08:32 PM   #3
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How did you "REBUILD" the carb without cleaning it out, blowing through all the ports and replacing all the parts in it? Just would like to know so I can save all that Work and Money, over the way I was trained to do it!
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Old 03-12-2012, 09:06 PM   #4
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How did you "REBUILD" the carb without cleaning it out, blowing through all the ports and replacing all the parts in it? Just would like to know so I can save all that Work and Money, over the way I was trained to do it!
I meant as I rebuilt it I blew every whole out with carb cleaner making sure there were no blockages.
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Old 03-12-2012, 09:12 PM   #5
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I replaced the fuel pump before I rebuilt the carb. So its about a week old now. Puping like a champ
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Old 03-12-2012, 10:43 PM   #6
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OK. So My 87 has been sitting for 2 years and it runs ust fine when you poor gas down the carb. But I'm having issues with gas going through the carb. I rebuilt the carb, but there are still issues. the first issue was gas was not even getting into where the floats are. So I got the needle unstuck and made sure there was gas in the carb. But then gas wasn't shooting through the jets. There are no blockages Ive checked for that and there is gas getting all the way to the carb ust not through it. Should I just buy a new carb or is there a way to fix this. Plenty of gar is getting pumped towards the carb so i dont believe its a tank issue or fuel line. Who ever can help, please help!!!!
Try turning the 2 adjustment scews, one gas, one air, all the way in till they just stop turning, then screw them both out 1 1/2- 2 full turns and that should be good to let it run. Then adjust each one slowly till it idles good! Could also be a bad leak at the base gasket??? Or some other vacumm leak!! If any of that helps!!
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Old 03-13-2012, 08:42 AM   #7
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Try turning the 2 adjustment scews, one gas, one air, all the way in till they just stop turning, then screw them both out 1 1/2- 2 full turns and that should be good to let it run. Then adjust each one slowly till it idles good! Could also be a bad leak at the base gasket??? Or some other vacumm leak!! If any of that helps!!
Thank you! I'll go home and try that today. I don't even want to think about vacuum lines with this thing. The guy who had it before me had them going everywhere.
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Old 03-13-2012, 06:59 PM   #8
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I replaced the fuel pump before I rebuilt the carb. So its about a week old now. Puping like a champ
Not the fuel pump, the accelerator pump. It's in the carb. Usually looks like a square rubber diaphram with a spring in the center. Not sure about the one in your carb though. I've never taken one of these apart.

Something like this...
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Old 03-13-2012, 10:56 PM   #9
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sounds to me like mixture too. do the above act with the screws. BTW what type of carb is it? is it the stock one? let me know I will gladly walk you through it.
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Old 03-14-2012, 08:46 PM   #10
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sounds to me like mixture too. do the above act with the screws. BTW what type of carb is it? is it the stock one? let me know I will gladly walk you through it.
Its a replacement carb from advanced auto. I bought it about 6 years ago. But its basically suppose to be the same as stock.I've been all through it and havent seen any accelerator pump. Which mixture screw? The two at the very bottom that have like springs? I'm thinking it has something to do with some type of pressure problem. I don't understand why the carb wouldn't work when there are 0 blockages and the fuel pump is pushing plenty of fuel towards it. I'll try tomorrow after work to make the adjustments and let every one know what happened.
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Old 03-14-2012, 09:38 PM   #11
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Originally Posted by Red1USF View Post
OK. So My 87 has been sitting for 2 years and it runs ust fine when you poor gas down the carb. But I'm having issues with gas going through the carb. I rebuilt the carb, but there are still issues. the first issue was gas was not even getting into where the floats are. So I got the needle unstuck and made sure there was gas in the carb. But then gas wasn't shooting through the jets. There are no blockages Ive checked for that and there is gas getting all the way to the carb ust not through it. Should I just buy a new carb or is there a way to fix this. Plenty of gar is getting pumped towards the carb so i dont believe its a tank issue or fuel line. Who ever can help, please help!!!!
First, are you talking about the ports that feed the throat of the carb or the jets?

There are other types of accelerator pumps as well. That type is just the first one I found a pic of. This is another type.


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Try turning the 2 adjustment scews, one gas, one air, all the way in till they just stop turning, then screw them both out 1 1/2- 2 full turns and that should be good to let it run. Then adjust each one slowly till it idles good! Could also be a bad leak at the base gasket??? Or some other vacumm leak!! If any of that helps!!
Not saying that this is wrong but unless the screws are seated tight against the body of the carb shouldn't the throttle still shoot gas into the carb? Mine always have in the past. Shouldn't rocking the throttle back shoot gas into the throat regardless if the mixture is correct or not?

My carb knowledge is limited but I have taken a few apart and put them back together and never had this problem.
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Old 03-14-2012, 11:43 PM   #12
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I've got the plunger type shown on the bottom. When I did the rebuild I replaced that. Everything is tight and when my neighbor dragged me around the block in it, every time I hit the gas you can hear it suck for air. It just will not take gas into the carb.I replaced all the gaskets and made sure everything was locked down tight.
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Old 03-15-2012, 09:51 AM   #13
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take the fuel line off the carb and crank the engine. is fuel coming out at the end that hooks to the carb? if so, then you have some kind of blockage in the carb so you need to take it apart and rebuild it again. if there fuel in the bowl when you take the top of the carb off? if there is fuel there, then your jets have junk in them or below them in the passages. the last place would be in the emulsion tubes or in the actual squirters, themselves
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Old 03-15-2012, 02:04 PM   #14
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take the fuel line off the carb and crank the engine. is fuel coming out at the end that hooks to the carb? if so, then you have some kind of blockage in the carb so you need to take it apart and rebuild it again. if there fuel in the bowl when you take the top of the carb off? if there is fuel there, then your jets have junk in them or below them in the passages. the last place would be in the emulsion tubes or in the actual squirters, themselves
I've had that carb apart and back together several times. NO blockages found anywhere. It was having trouble putting gas into the bowl itself. I replaced the inlet neddle and I replaced some of the fuel line that was cracked. I thought I might me having pressure issues with the hose. But once fuel gets to the pump it pumps through the hard line and thats all clear. So I don't know why it wouldnt have enough pressure to push it through into the bowl. As you can tell I have several issues here. Its got plenty of pressure. It really dumps the gas out when you pull the line off and crank it over. I'll go home tonight put gass in the bowl seal it up and blow on a tube while simultaneously working the throttle. If it get gas to go through there then, then I guess I have a pressure issue, but having just replaced the pump, and having used the carb for a while before having this issue I don't understand how all of a sudden it would be having a pressure issue.
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Old 03-15-2012, 09:31 PM   #15
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Hmm. Puzzeling for sure. Maybe you could pull up a schematic for that carb and see what is what. Maybe something was put back the wrong way accidently when you rebuilt it. I' m not accusing just trying to throw out ideas.
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Old 03-15-2012, 09:34 PM   #16
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Good news, fixed the carburetor. The two pins that drop into the inlets werent coming up high enough to allow gas in. Adjusted that and now I have gas squirting in. Now there is a leak in the gas line the 6 inches or so of hose that comes out of the tank before it hits the hardline because the pump isn't drawing from the gas and its the only part of hose that hasnt been replaced. I took a hose and hooked it up to the hardline and sucked and I couldn't get the gas to draw from the tank. So I guess I'll be dropping the tank this weekend and replacing that. Any one have any good methods for dropping the tank. Its got a good 6-7 gallons of gas in it. Should I siphon the tank out first?
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Old 07-10-2012, 09:01 AM   #17
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I would check the fuel filter on the frame before dropping the entire tank.
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Old 07-10-2012, 09:07 AM   #18
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if you end up with carb issues again look into the motorcraft carb swap.

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