The jeep recently started acting likes it's running out of fuel even though I ve filled her up.
The carb is fairly new, edlebrock, but has been running like a champ since I got the jeep.
Backstory: She still starts up fine cold or after it has been shut off for a short period of time. Ever since I got the jeep, it would be hard starting if she has been warmed up and then shut off for a lil, say drive to walmart, then try to start it after you checked out. But if I start it when cold, recently shut off, or after a good while (not cold but not hot) it starts fine. I figured the heat was boiling the fuel in the bowl as Ive read that was a common problem.
Otherwise the jeep ran fine. Monday the jeep acted like it was low in fuel so I filled it up (No gauge) and went on my way. It still continued to stumble and still does.
Seems like if Im at a decent cruising speed (45-50mph) she does it a lot. At a light it'll do it randomly as well when Im at a slow cruise. If I gun it, it reacts fine until you get a cat-like Hiss out of the exhaust. Under load up a hill is generally fine as well though it may or may not stumble.
This happens hot or cold. I have a fairly new MSD ignition module coild is still fairly new and all the plugs are pretty.
Im going to change the fuel filter just because I have one anyway, and I was kind of thinking it may be the manual fuel pump but wouldnt it be hard starting most of the time if it were bad? Imma smell the oil and see if it smells like fuel. No vacuum leak.
Any ideas? There is very little electrical on this thing. Coil, Plugs, Ignition, and lights make up all of the electrical components.
It does sound like a fuel boiling problem, get it hot, shut it off and watch inside the carb throat to see if fuel is dumping into the intake. If it is, get a non-metal carb spacer and see if that makes a difference.
Other things to consider:
I'd open the carb up and see if the needle jets/float bowls have any crap in them.
Check the output of the manual pump and see if it is giving you enough fuel at above idle RPM's.
Timing issues? Maybe the dist. is loose or the timing chain slipped a tooth?
What year? In my old 62 cj5 the fuel line was original and developed a pin hole so when driving I would periodically have cutting out issues. I located the pin hole but several times another hole would develop. I had to change all the fuel line to fix the problem.
Mine was doing the same right after i bought it. Did the same as you just kept filling it up. Changed the fuel filter. After replacing the fuel filter take the hose off going to carb and put it into a glass jar, turn you motor over and see if you are getting fuel. If you are getting fuel you should be good. It sounds like you might wnat to try this after you are at operating temp. Also I would check what others have said with your carb.
My problem turned out to be a problem with the tach wiring. Traced it down and rewired with a new tack and it ran like new again.
My jeep actually has a 318 in it.
I stuck a clear filter on to see if any fuel is going through and it is. It filled up then once she got warm the filter was looking empty. Not sure if this is normal or if it should be full all the time.
I checked the lines to see if any were hard and cracked. I havent been running a tach for the past 2 months and the PO didnt have it hooked up.
I meant to check to see if the dist was tight but forgot.
I'll have to check my timing, if the chain jumped would that tell me or do I have to pull the cover?
I smelled the oil and found no traces of fuel.
After testing for spark from everything and making sure I have proper fuel, I was looking at wires and noticed that the MSD pickup wires that go to the dist. weren't protected at the plug end to the MSD. Both wires (Green & purple) though plugged in all the way still had metal exposed. It was sitting under the MSD box and since the running out of fuel feel was sparatic, I was thinking maybe the metal on the wires were contacting the metal on the battery tray.
Can these wires "ground" out and interrupt the magnectic flow?
didja look inside the tank? if your fuel gauge isn't working and everything around the gauge seems wired and grounded properly, it would be logical to assume (bad word, I know) that you haven't looked to the sending unit to be that problem, hence, indicating you haven't looked at what it is like inside there. when i had problems stumbling under a load, and after replacing filters and the fuel pump, at the suggestion of someone here, I pulled the tank and found it full of sand and crud from the PO's joyous mud riding adventures. cleaned it out, passivated it, POR'd it got the sending unit working, replaced the sock filter, replaced some bad return fuel line (rubber at the tank), put it back together, problem gone. just a thought.........
I haven't checked timing yet. Misplaced my gun and waiting for a buddy to lend me his next time we meet up.
I haven't looked in the tank yet but once I run low in fuel again I will. I need to pull it to install the sunpro sender anyway.
what throws me off is how random it is. Yesterday it ran great each time I drove it. today it stumbled this morning on my way to work for a block but stabled out again. On my way home and errands, it ran great. I dont get any stumbles under load if shes running fine. It's random and happens when it wants. Starts up each time as if it were EFI except after that certain length of time. Ive always figured it to be boiling on that incident though.
I guess I'll replace the lines and open up the tank.
When it will not start, look down the carb, open the throttle briskly. If you see fuel spray from the accelerator pump, you have fuel. If so engine may be flooded or you do not have proper fire or properly timed fire. IF NO fuel from accelerator pump look at pump filter and line issues. Remember to run, you need a proper fuel/air mixture and fire. Once had a cj3 jeep in our club that always developed fuel problems on every outing. We got tired of the hassel and removed the tank. What we found was a toy plastic indian holding a rifle in his outstreched arm. We put the indian in a glass of gasoline. It sort of floated, not on top of gas and didn't sink to bottom either. It would float with the rifle pointing down. We theorized it would float around and the rifle would go down the sucking fuel outlet hole. Engine would die. With engine off the indian would just float away to cause havoc on another day.
The no start issue happens if she's warmed up, if I were to say park and go into walmart for a lil and come back out, it'll turn over a few seconds and starts right up. But Started for the first that day fires right up like it was EFI or if left sitting for awhile, it'll start right up as well. I read that the fuel in the bowl is boiling off which is what causes the few second starting.
Had that since day one, but never really cared on that.
I will drop the tank though, perhaps the sock is dirty if nothing else. I know Im getting fuel though to the carb. I can also see it in the clear filter as well.
A lot of people are having issues with older vehicles due to all the crap (ethanol) they are putting into gas now. Try running a few tanks of ethanol free gas through it and see if that helps after you get the tank squared away.