Fuel Delivery 1988 Jeep 4.2L (Page 1/1)
maddoc FEB 12, 06:44 PM
Like my 88GT I love my Jeep, his name is Jerry {son calls it that} , had them way too long and don't plan on gitiin rid of them . mMy prob. is that awhile back it took longer and longer to start. BUT once started, it ran just fine. Since I have problems with my body I can't afford to break down anywhere. So Jerry sits in the garage. QUESTION, what would cause such a long time spinning the engine to get gas to the carb. It usually takes 3 to mabe 5 minutes to get it started. Have replaced the fuel pump a few times to no avail. Thinking about putting in an electric pump. But, I really don't think that will solve the initial problem. ALL responses will be greatley appreciated. Jerry wants to see the road again.
carnut122 FEB 15, 09:36 PM
Before cranking the engine, pull the air cleaner and, using a flash light, look down the carb while pumping the throttle butterfly on the carb. You should be able to see gas squirting into the throat. Also, maybe the choke isn't closing; you should have to open the choke flaps on top to be able to look down the throat. If the choke isn't closing, it will take a lot of pumping on the gas pedal to start a car in very cold weather (haha, I just saw you live in FL, so this one's probably not your issue). When was the last time you replaced the furl filter?

[This message has been edited by carnut122 (edited 02-15-2015).]

maddoc FEB 15, 10:29 PM
First I have to appologize to others who have read this. I thought I was making a reply post to another thread I started a little way down this page. Sorry.. To answer your post and the other ones: 1988 Wrangler 4.2 L , Have a Weber carb on it. Have changed the filters and fuel pump several times.As for fuel, disconnected hose from carb and stuck it in a bottle while my son spins it . No gas. It just seems as though when it gets ready to give me gas , it goes and runs fine until it sits again.
carnut122 FEB 16, 03:45 PM

quote
Originally posted by maddoc:

First I have to appologize to others who have read this. I thought I was making a reply post to another thread I started a little way down this page. Sorry.. To answer your post and the other ones: 1988 Wrangler 4.2 L , Have a Weber carb on it. Have changed the filters and fuel pump several times.As for fuel, disconnected hose from carb and stuck it in a bottle while my son spins it . No gas. It just seems as though when it gets ready to give me gas , it goes and runs fine until it sits again.



Unless it's been sitting for a long time, there should still be enough gas in the carb to start up. I assume the mechanical pump is on the motor and run off of an eccentric on the motor? Maybe the gas tank is full of rust? I had a 79 Mustang like that. It would get low on gas and the rust would be concentrated enough that when the motor was under high demand, it would coat the sock. After it sit a bit it would be ready to run some more. Maybe the sock on the tank filter is so clogged that the starter doesn't spin the pump fast enough to pull the gas through the sock? I don't guess you've cut up a filter yet to see if the tank side is clogged? I used to blow through the tank side of the filter (being careful not to ingest an gas) to check for flow. I assume the filter isn't one of those sintered bronze filters? I'd be tempted to pull the filter and tap the tank side of it onto a paper towel and see if a bunch of crud comes out. If you geta bunch, it might be time to buy a bigger capacity filter to put in line before the little filter (assuming it's little). One last thing, I once had a carb ingest charcoal out of the evap canister into the fuel intake of the carb and it caused some issues.
maddoc FEB 17, 08:40 PM
Sounds as if that may be my problem. Although the tank is plastic. When I replaced the sending unit, there ws a lot of crud that I thought I cleaned. Never thought to check the pick-up tube. Now all I have to do is get my son away from the GT , his friends, and girl.for a day of dropping the tank again. Thanks
CoolBlue87GT FEB 19, 09:45 PM
One of my employee's has a jeep that was doing the very same thing. He dropped the tank, checked the sending unit / pump, replaced plugs, cleaned injectors, none of these worked, then he replaced the injectors, end up with the same problem. Took it to a shop, they found a relay under the hood that was not working correctly. His had the 4 cyl.

Good luck.
maddoc FEB 20, 02:47 PM
Don't know if that would apply in my case, I've "nuttered" it which means the comp doesn't control anything but spark. Thanks for the reply.
2tone86gt MAR 02, 06:23 PM
The stock weber carbs are known to be problematic. I have an 89 and when I bought mine somebody had thrown a ford motorcraft on it. I believe it was a little much but I never had any issues of not getting enough fuel.. in fact quite the opposite. On a good day I'd get 10 mpg but it was reliable. I'm sure there is info out there on using a ford carb on the jeep forum, I don't remember what model it was but it's food for thought.