International Full Size Jeep Association
Home Forums Reader's Rigs Tech Library Trail Stories FSJ-List
International Full Size Jeep Association  

Go Back   International Full Size Jeep Association > Tire Kickin' > General FSJ Tech

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 06-03-2007, 04:29 AM
BigBlueYJ's Avatar
BigBlueYJ BigBlueYJ is offline
232 I6
 
Join Date: Apr 26, 2006
Location: Woodlawn, VA
Posts: 158
Jeep likes the driveway, just not the road

I have a 79 jtruck with the 360 and a Holley 4BBL on it. I get ready to drive it home and crank it up. Cranks fine, idles fine. I start out the road and get about half a mile and it sputters and dies. I pull off the road and try to crank it again. Cranks fine. Take off again and get about another half a mile and it does it again. I suspected that the electric fuel pump I had on it wasn't keeping up with the carb. So After I get it to my house, I went and bought a mechanical pump and put it on. Sitting there idling it does fine, holding the throttle open it does fine, driving it out the road is another story. I get it out on the road and when it gets going, it sputters and dies. I have checked the fuel system and it's good. The timing could be a degree or two off, but it shouldn't rev up though right? Maybe the floats in the carb? I'm out of ideas. Any help would be appreciated.
__________________
89 Wrangler, 350LT1 sbc, NV4500, NP231 w/SYE, SOA'd with custom framework, HP44/60 locked w/ 4.10's on 36 super swampers

79 FS J10 with 5.3 swap, S465 and 205. Sitting on a HD44/14 bolt and 37's. This thing should be fun to drive if I ever get it finished.
Reply With Quote
  #2  
Old 06-03-2007, 04:51 AM
garyindiane's Avatar
garyindiane garyindiane is offline
Member
 
Join Date: Nov 08, 2006
Location: Brookville, Indiana
Posts: 72
Mine did the same thing. It turned out to be the fuel filter. When I would drive down the road the filter would clog up because of the bumps jaring the sediment around. Parked it ran like a dream because it had settled. Do you have a pressure reg, fuel pressure guage, or a return line? What kind of electric pump? What CFM Carb? Anymore more info can help.


Peace Gary
__________________
FSJ-Less
Reply With Quote
  #3  
Old 06-03-2007, 06:50 AM
joe joe is offline
 
Join Date: Apr 28, 2000
Location: PNWet, USA
Posts: 22,378
Weak pump or fuel restriction would be my guess too. If it only stumbles on acceleration the vacuum advance may not be working but it shouldn't stall the motor.
__________________
joe
"Don't mind me. I'm just here for the alibi"
Reply With Quote
  #4  
Old 06-03-2007, 07:02 AM
grand_wag_85's Avatar
grand_wag_85 grand_wag_85 is offline
Murphy's Law Poster Child
 
Join Date: Dec 03, 2003
Posts: 10,707
When I did my fuel pump it was doing the exact same thing you describe as there was a kinked line after I put it back in the Jeep, made for a LONG ride home from work
__________________
You know it's bad when your car's on the EPA's 10 most wanted list!

'82 J10
'65 J2000

Reply With Quote
  #5  
Old 06-03-2007, 07:22 PM
BigBlueYJ's Avatar
BigBlueYJ BigBlueYJ is offline
232 I6
 
Join Date: Apr 26, 2006
Location: Woodlawn, VA
Posts: 158
I have the 650 Holley, with a return line on the fuel filter. I have blown air back through the lines to the tank, so I know they aren't clogged up. I pulled the pickup out of the tank and cleaned them, make sure the bottom of the tank wasn't dirty either. I haven't checked the fuel filter to be honest, however it isn't that old, and I know that alot of gas hasn't been through it, since the jeep hasn't been run that much in the last 6 months, other than out of a gas jug. And for some reason the vacuum advance is on manifold vacuum. I don't know why this was done but the guy who put the motor in it, said it was the pickiest motor he has ever dealt with when it come to timing it. Maybe that is some inkling to why it won't run, but it ran like that before it was parked though. And ran really well at that.
__________________
89 Wrangler, 350LT1 sbc, NV4500, NP231 w/SYE, SOA'd with custom framework, HP44/60 locked w/ 4.10's on 36 super swampers

79 FS J10 with 5.3 swap, S465 and 205. Sitting on a HD44/14 bolt and 37's. This thing should be fun to drive if I ever get it finished.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 07:49 AM.


Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
corner corner