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Unread 04-27-2011, 10:23 AM   #1
mannyfresh
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Fuel Delivery Problems!! I've tried everything....

Ok. 1981 CJ-5 won't turn over. I've dropped the tank and replaced all the rubber lines going to the tank and the sending unit. I've also replaced the fuel pump, fuel filter, the rubber lines from the pump to the carb and return line. I've made sure that the return on the fuel filter is above the outlet. When I pull the outlet on the fuel pump, pour gas down the carb breather, and start her up, it will run for a couple of seconds and gas spurts out of the fuel pump oulet. I can keep her running doing this, but only by continuously pouring gas or carb cleaner down the breather (even when all the fuel lines are connected properly). So, I don't think its a vacuum or pressure problem.

Everything worked fine up until I dropped the tank. After the tank went back up, started up fine. Drove her around twice for a total of about 30 minutes. I think I ran out of gas because I was sputtering into the driveway... then the problem started.

Any help would be greatly appreciated!!

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Unread 04-27-2011, 10:38 AM   #2
mcmud
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Float stuck?
Although this would not resolve that issue, rather than pouring gas into the carb for the short run why not fill the bowl. No mention of which carb is mounted but they all have a atmospheric vent providing a means to add about 2oz. of fuel. That might allow enough run time for the pump to fill the bowl.
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Unread 04-27-2011, 10:39 AM   #3
mastercraftka
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When you take your hand on the throttle and advance it do you see gas squirting out? If not you may have the acclerator pump on the carb out.
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Unread 04-27-2011, 10:50 AM   #4
BagusJeep
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I presume you have disconnected the fuel pump at the carb and checked that fuel spurts out?

If so then it is a carb blockage. It may be the inlet to the floats or a jet. Either could become blocked quite easily.

If the bowl is empty it is a blocked inlet.

If full then it is a blcockage somewhere else. If fuel sprays out when you move the throttle the accelerator pump is working.


Do you have the 3 way filter before the carb? With the fuel return line running from the 12 o clock position?
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Unread 04-27-2011, 11:03 AM   #5
Jon In Tucson
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Back to basics...

Manny,
Let's look at the basics, Is there fuel in the tank? Is it possible that the fuel line from the sending unit and pickup tube got kinked when you put the tank back up? If you remove the fuel filter and tap it on the sidewalk is it clear? Is it possible that when the jeep ran out of gas it sucked up some sediment and plugged the filter? Can you get fuel out of the line coming from the tank to the fuel pump? Is it plugged? disconnect from fuel pump and blow back to tank. Use some clean hose and use your lungs, not compressed air. When you blow into that line, do you feel resistance? If you do then the line has a blockage. If you don't, do you hear bubbles in the fuel tank? If you hear bubbles, the line is clear and there is enough fuel in the tank for the fuel pump to pick it up. If there is no resistance, air goes through, but no bubbles, then put more gas in the tank and try again.
If you were to take a length of fuel hose and attach to the line coming out of the fuel pump and stick it in a bucket, turn the key and let the engine crank for a minute, how much fuel would be in the bucket? In about a minute of pumping you should have at least a quart of fuel in the bucket. Just like solving a math problem, you have follow an order of operations. Start at the tank and work forward. Do know if the carb is OK? Could have some sediment plugged the needle seat? Good luck and God bless.
Jon In Tucson
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Unread 04-27-2011, 06:59 PM   #6
mannyfresh
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Thanks for the quick responses!

Carb is a remanufactured Holley Carb. When I pulled the throttle cable I don't see any gas squirting out. I do have a 3-way fuel filter and it's set up with the return at 12 o'clock. I took the fuel filter off a week ago and couldn't blow air through it, so that has already been replaced. Gas is in the tank. I've got a MC 2100 that was planning on rebuilding and swapping out soon. Looks like I might be doing that sooner expected.

I'll try some of the other suggestions in a couple days and will let you know how things turn out. I'm been trying those order of operations, but I'm working backwards from the carb to the tank.... I don't want to drop that tank again if I don't have to!!
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Unread 04-27-2011, 08:45 PM   #7
mastercraftka
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Your not getn fuel in carb or the accelerator pump is out. Take the top of the carb off and see if there is gas in the bowl. If so pump is out easy fix if that.
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Unread 09-24-2011, 03:49 PM   #8
mannyfresh
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UPDATE:

I rebuilt the Carter BBD carb. Put the carb back on and viola... i was getting fuel. My adjustments were off so I took the carb back off, made the adjustments, put it back on and I wasn't getting fuel anymore. I removed the inlet hose into the fuel pump and put it in a 2 gallon gas can. Jeep started up and ran great. Blew the lines and it didn't seem like air was getting to the fuel tank. So, I dropped the fuel tank again and blew the lines again and air was getting through. Then I took my outlet fuel line and return line from the sending unit and put them into the 2 gallon gas tank. Jeep started up and ran great. Then I hooked the two lines back up to the sending unit and put it in the 2 gallon gas tank. Jeep started up and ran great. Put the sending unit back on the fuel tank and reinstalled it. Jeep started up and ran great. Even took her around the neighborhood and let her run in the driveway for about 10 minutes before calling it a day. 2 hours later I go to start her up and she won't crank. Doesn't seem to be getting fuel again. Yes... there is gas in the tank.

I'm running out of ideas!!
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Unread 09-24-2011, 06:05 PM   #9
Jon In Tucson
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Quote:
Originally Posted by mannyfresh View Post
UPDATE:

I rebuilt the Carter BBD carb. Put the carb back on and viola... i was getting fuel. My adjustments were off so I took the carb back off, made the adjustments, put it back on and I wasn't getting fuel anymore. I removed the inlet hose into the fuel pump and put it in a 2 gallon gas can. Jeep started up and ran great. Blew the lines and it didn't seem like air was getting to the fuel tank. So, I dropped the fuel tank again and blew the lines again and air was getting through. Then I took my outlet fuel line and return line from the sending unit and put them into the 2 gallon gas tank. Jeep started up and ran great. Then I hooked the two lines back up to the sending unit and put it in the 2 gallon gas tank. Jeep started up and ran great. Put the sending unit back on the fuel tank and reinstalled it. Jeep started up and ran great. Even took her around the neighborhood and let her run in the driveway for about 10 minutes before calling it a day. 2 hours later I go to start her up and she won't crank. Doesn't seem to be getting fuel again. Yes... there is gas in the tank.

I'm running out of ideas!!
Manny,
If you take the gas cap off do you hear a pressure or vacuum sound? (I can't bear to to say "sucking sound") Could the vapor system be not working and the tank is sealed up so tight that as the fuel is used by the engine a vacuum is being created in the tank by the elimination of the fuel? Just a guess... God Bless.
Jon In Tucson
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Unread 09-24-2011, 07:08 PM   #10
mannyfresh
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Jon,

I just took off the gas cap and I didn't hear anything. No suction or sound of pressure releasing. Strange right? Pressure should be built up in the tank from the fuel being sucked out right? Any ideas? I was thinking if my connections for the roll over protection and liquid check valves had anything to do with my problem...
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Unread 09-24-2011, 07:14 PM   #11
stodg73
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I hate to say this, but I just did this yesterday, it sucked. I would drive for about 10 minutes or less and the Jeep would die. No gas in the carb when looking down the throat with the breather off, no gas in the carb. Trouble shot everything, gas in the tank(full tank), gas to the pump(replaced pump), gas to the fuel filter inlet, no gas past the fuel filter. So, I went to NAPA and got a clear fuel filter and hooked it up. This way I could see if there was fuel going through. Fuel was going through the clear filter, I did not hook up the return line, so I have to fix the return line. The Jeep started and ran just like always.
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Unread 09-24-2011, 10:40 PM   #12
mashunitjeep
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My advice get rid or the carter my experience they nver stay tuned and the always breakin
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Unread 09-25-2011, 06:45 AM   #13
mannyfresh
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stodg73: So your return line at the filter or at the tank wasn't hooked up? My return is hooked up... i forgot about it when pulling gas out of the can and gas ended up returning all over the ground.

mashunitjeep: I'm planning on it one of these days! I'm pretty sure the Carter is working (at the moment) and the problem is somewhere else. I don't want to throw another variable in there by switching carbs until I get it running with the Carter first.
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Unread 09-25-2011, 09:37 AM   #14
jalves3
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Since the problem started after you dropped the tank, I would concentrate there. My guess is the fuel line is kinked/twisted somewhere and after some time under stress, it collapses. The 2 times you have installed the tank everything was fine for a short period. It could be something with your check valves but I have zero knowledge of that system.
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Unread 09-25-2011, 11:37 AM   #15
stodg73
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I haven't been able to see if the return line is plugged from the filter to the tank yet. But with the clear fuel filter, you will be able to see if fuel is getting to/through the fuel filter, that way you know that you have fuel there.
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