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Unread 06-16-2013, 07:19 PM   #1
spawnofsatan
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1990 YJ Wrangler 
 
Join Date: Sep 2008
Location: nj
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1990 Jeep YJ

Hey guys took my jeep out today after setting in the garage for say about 4-5 months everything seems ok until I started to climb a hill jeep started to jump forward and died waited few min and jeep start right up started the climb again and it was fine for say about 1min then it started to act up again I have to ease on the gas paddle to make it up the hill seems like fuel delivery.

FYI MC carb

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Unread 06-16-2013, 07:28 PM   #2
superj
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1987 YJ Wrangler 
 
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Location: corpus christi, texas
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Sounds like the accelerator pump might have some junk in it. It only does it while you try to accelerate? Is it anytime you want to take off? Maybe a vacuum line also?
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Unread 06-16-2013, 07:47 PM   #3
spawnofsatan
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1990 YJ Wrangler 
 
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ill check tom
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Unread 06-16-2013, 11:06 PM   #4
jred
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1994 YJ Wrangler 
 
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Did you Stabil the gas before it sat up or put fresh gas in? Around here gas is usually only good for a couple of months before it turns to crap.
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Unread 06-17-2013, 08:25 AM   #5
spawnofsatan
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1990 YJ Wrangler 
 
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Quote:
Originally Posted by jred View Post
Did you Stabil the gas before it sat up or put fresh gas in? Around here gas is usually only good for a couple of months before it turns to crap.
Jred no I did put stabil the gas tank but it was on E when fill it up should I put fuel stabilizer on the fuel tank..
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Unread 06-17-2013, 11:01 PM   #6
jred
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1994 YJ Wrangler 
 
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Location: Memphis, TN
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If it's gonna sit more than a month, I either run it dry (hard to do without getting stranded) or put Stabil in the tank. The larger amounts in automotive tanks seems to last longer than a 3 gallon can for mowers, but it doesn't hurt, and if it does happen to sit there for a while, you're good up to a year & a half.

Sounds like you were pretty much on empty, then put fresh gas in it, so you should be good in that respect. Carbed, I'd check/rebuild it. I bet some varnish built up and/or has some junk in it.

The way you have to ease down on the gas tells me that it's starving for gas. The very FIRST thing is to verify you aren't out of gas. The gauge may be wrong. Fill 'er up! ^see below. Next, a fuel filter is a cheap thing to check. If you still have issues, pull the fuel line from the carb & put it in a small bottle of some sort & have someone try to crank it. If it "seems" like it's spitting it out good, get fancy & do a pressure test to be sure "spitting out good" is actually good. If it's barely spurting, you get to enjoy a fun job with the fuel pump. Carb cleaning, depending on your skill or aptitude. That should get you going.

I'd just finished a hardtail chopper & took off on a 1000 mile road trip. 50 miles in, start having trouble. I can start it, but any throttle kills it. This really stunk cause it was kickstart only. It'd idle for 5 or more minutes, though. I open the tank, I can SEE I have half a tank, and mileage/capacity said I should be good for 100+ miles. Like I said, I'd just barely finished bolting it all together. I didn't even have rear brakes. I expected to need to rebuild the carbs at some point, so I'd thrown a kit in my bags. So here I am, rebuilding the carbs and rejetting on the side of Hwy70 in a bazillion degree heat... no shade. Same thing. A few coarse words may have left my mouth. My riding partner put me on the back of her Honda Rebel 250 & we went up the road for a beer. It was sooo much fun arriving at a middle of nowhere honky tonk in the middle of the afternoon riding b1*^&. When we left, everyone actually came to the door to get a good look :P Get back to the bike, and I immediately knew the problem. When the rear got cut off & welded back up, it changed the angle of the backbone, and my tank was sitting at a 45deg angle. The petcock was smack dab in the middle of the tank. So even with a half tank of gas, I was... out of gas. I unbolted the rear mounts, rotated the tank back to horizontal, and propped it up with an empty Mtn Dew bottle. For the rest of the trip, that empty bottle sat in my saddlebag as a "reserve".

Anyway, the moral of the story is, even if you KNOW you've got plenty of gas, make sure you're not out of gas!
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Unread 06-18-2013, 04:30 PM   #7
spawnofsatan
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1990 YJ Wrangler 
 
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Quote:
Originally Posted by jred View Post
If it's gonna sit more than a month, I either run it dry (hard to do without getting stranded) or put Stabil in the tank. The larger amounts in automotive tanks seems to last longer than a 3 gallon can for mowers, but it doesn't hurt, and if it does happen to sit there for a while, you're good up to a year & a half.

Sounds like you were pretty much on empty, then put fresh gas in it, so you should be good in that respect. Carbed, I'd check/rebuild it. I bet some varnish built up and/or has some junk in it.

The way you have to ease down on the gas tells me that it's starving for gas. The very FIRST thing is to verify you aren't out of gas. The gauge may be wrong. Fill 'er up! ^see below. Next, a fuel filter is a cheap thing to check. If you still have issues, pull the fuel line from the carb & put it in a small bottle of some sort & have someone try to crank it. If it "seems" like it's spitting it out good, get fancy & do a pressure test to be sure "spitting out good" is actually good. If it's barely spurting, you get to enjoy a fun job with the fuel pump. Carb cleaning, depending on your skill or aptitude. That should get you going.

I'd just finished a hardtail chopper & took off on a 1000 mile road trip. 50 miles in, start having trouble. I can start it, but any throttle kills it. This really stunk cause it was kickstart only. It'd idle for 5 or more minutes, though. I open the tank, I can SEE I have half a tank, and mileage/capacity said I should be good for 100+ miles. Like I said, I'd just barely finished bolting it all together. I didn't even have rear brakes. I expected to need to rebuild the carbs at some point, so I'd thrown a kit in my bags. So here I am, rebuilding the carbs and rejetting on the side of Hwy70 in a bazillion degree heat... no shade. Same thing. A few coarse words may have left my mouth. My riding partner put me on the back of her Honda Rebel 250 & we went up the road for a beer. It was sooo much fun arriving at a middle of nowhere honky tonk in the middle of the afternoon riding b1*^&. When we left, everyone actually came to the door to get a good look :P Get back to the bike, and I immediately knew the problem. When the rear got cut off & welded back up, it changed the angle of the backbone, and my tank was sitting at a 45deg angle. The petcock was smack dab in the middle of the tank. So even with a half tank of gas, I was... out of gas. I unbolted the rear mounts, rotated the tank back to horizontal, and propped it up with an empty Mtn Dew bottle. For the rest of the trip, that empty bottle sat in my saddlebag as a "reserve".

Anyway, the moral of the story is, even if you KNOW you've got plenty of gas, make sure you're not out of gas!

Wow I read all that lol but sound like you fun I wish I can afford a chopper would be sooo sweet.. I'll check on the jeep this weekend I been driving home- work around town and so far so good but I'm taking it paint balling this weekend see how she run few hills I have to climb...
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Unread 06-25-2013, 03:36 PM   #8
spawnofsatan
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1990 YJ Wrangler 
 
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Location: nj
Posts: 270
Update

Fuel pump is working just fine still act up I can drive it for about 10-15 min then is would bog down like no fuel but when I stop and put in park step on the gas no problem I just rebuild this carb 2 year ago..
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Unread 06-25-2013, 08:05 PM   #9
OneWormYJ
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1994 YJ Wrangler 
 
Join Date: Jan 2013
Location: Justus, PA
Posts: 5
Good luck on figuring this out...I'm dealing with something similar. Also looking for advice.

Here goes:
This jeep runs fine on the flat/downhill, but when it's going uphill it runs out of fuel, no matter how much is in the tank. We've unhooked the line from the carb both on the flat and on a hill, when it's on the flat: plenty is coming out, when it's on the hill: nothing, even though the pump is still running. Once the bowl runs dry the jeep dies.

Specs: 1988 YJ
Weber Carb - freshly rebuilt
New fuel pump - electric, not manual as it should be
Aftermarket poly tank - don't know anything about it, but we changed the fuel strainer, as it was cooked.
All lines look fine, not pinched, rotted or otherwise.
New fuel filter
Dropped tank and inspected everything - looks good.

We're working on this jeep for our friend, he's taken it other places and no one could figure it out, so the "Jeep Couple" got it. We've spent a lot of hours tinkering diagnosing and just checking things out. Thus, we're going to install a manual fuel pump and a check valve, perhaps not in that order and see what happens.

Any other thoughts or anyone hear about this before?
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Unread 06-27-2013, 08:54 AM   #10
OneWormYJ
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1994 YJ Wrangler 
 
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Location: Justus, PA
Posts: 5
We've figured it out!!! First, there was a crappy soft line that was dissolving from the inside out and polluting everything downstream from it. Fix and clean. Then we noticed that there was way too much fuel running into the return line and almost nothing making it to the carb when on a hill. Still don't know why, but we added a little more bend to the return line and that seems to have given it enough resistance without closing it off competely. Today will be test drive and final tweaking, but we are optimistic.
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Unread 06-27-2013, 09:19 AM   #11
rocketboy
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1989 YJ Wrangler 
 
Join Date: Jun 2011
Location: Houston, TX
Posts: 193
The filter has two lines coming out: one to the carb and one to the return line. If the soft line was putting out debris maybe the filter is clogged where it delivers to the carb.
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Unread 06-27-2013, 10:15 AM   #12
GrantYJ
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1992 YJ Wrangler 
 
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Location: Neosho, Missouri
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OP,
Just for giggles, throw some SeaFoam in it. If you're not familiar, this stuff is an additive (nowadays, you can get it almost anywhere, but O'Reilly's always seems to have it). It'll be a round metal can White with red script.

I've never been fond of additives, but I love this stuff. It's a cure all. It is a fuel stabilizer as well as a cleaner. I'm guessing that the fuel that was sitting in your carb left a nice varnishy glue behind as it evaporated and is now clogging something up in your carb. If this is the problem, this stuff will take care of it.
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