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Unread 07-29-2013, 08:21 PM   #1
Chipmunk222
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Wont start without gas in carb, any thoughts ?

Cj7, edelbrock carb.

Will turn over strong but won't start until you add gas to the top of the carb. After it starts it runs great, and will continue to start without adding the gas anymore until the next day.

I'm sure this is something simple, but if someone can send me in the right direction, I would appreciate it.

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1979 CJ7 AMC 360*T150 3 speed/Dana 20*Moser 1 piece axles*Edlebrock intake manifold/carb*Cooper Stt 35x12.50x15 tires* Black Keystone Wheels*MSD cap, rotor, wires*Rusty's HD Tie Rod and Drag link* Goferit tie rod reversal* Borgeson steering shaft* Sams HD steering box bracket*Tire Carrier Bumper*Skyjacker Nitro N8000 shocks*Mountain Offroad Heavy duty 4 inch shackles* 12,000 lb Badlands Winch with wireless remote*

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Unread 07-29-2013, 08:40 PM   #2
I6CJ7
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Sounds like your choke isn't working or coming on.
Does it have a manual or electric choke?
When the engine is fully warmed the butterflies should be fully open (vertical) with an electric choke. Are the closed when the engine is cold? And how many times do you pump the gas pedal before you hit the key to try and start it? Depending on how carbs are setup it can take one pump or a couple to throw enough fuel in the carb to start it cold. My weber takes one pump cold. And when you're looking down into the carb and you twist the throttle with your fingers, do you see a nice strong stream of fuel coming from each of the jets? Is it a 2 or 4 barrel?
Pics would really help.
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Unread 07-29-2013, 08:52 PM   #3
CJATE
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Mine does the same. I'm convinced I've got a vacuum leak. It allows the fuel to travel back into the tank.

Mine is not over night, but any longer then a few days and I have to pump the gas quite a bit. Like you say, runs like a top, once it's starts


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Unread 07-29-2013, 08:58 PM   #4
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Unread 07-29-2013, 09:38 PM   #5
thompsoj22
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accejerator pump

if all your doing is pouring a little gas down the throat and then it runs normal, id go straight to the accel pump. dont adjust things, with the ign off look down the throat of the carb an rotate the throttle linkage. you should see fuel squirting, if not then you have found your problem.
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Unread 07-29-2013, 09:46 PM   #6
Chipmunk222
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It's a 1405, 4 barrel, manual choke, and you can pump the pedal all day, one time or 100 times, and it's not gonna start until you add gas.
I'm carb illiterate, and I'm trying to help, but sadly I don't know much about carburetors.
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Unread 07-30-2013, 03:56 AM   #7
John Strenk
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Do you have a mechanical or electric fuel pump?

I had a weak pump on mine and after a few days it would not start because the pump could not pump up enough gas to the carb fast enough with cranking. All the pumping and all the choke wouldn't matter until I got gas to the carb.
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Unread 07-30-2013, 04:41 AM   #8
jeepdaddy2000
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Quote:
Originally Posted by Chipmunk222 View Post
It's a 1405, 4 barrel, manual choke, and you can pump the pedal all day, one time or 100 times, and it's not gonna start until you add gas.
I'm carb illiterate, and I'm trying to help, but sadly I don't know much about carburetors.
I would check here first....
Quote:
if all your doing is pouring a little gas down the throat and then it runs normal, id go straight to the accel pump. dont adjust things, with the ign off look down the throat of the carb an rotate the throttle linkage. you should see fuel squirting, if not then you have found your problem.
The accelerator pump is responsible for squirting a shot of raw gas down the throat of the carb.
With the choke open, look down the throats of the primaries (front two holes) and pump the accelerator linkage. You should see a shot of fuel squirt down the barrels each time you open the throttle. If you don't, then you will need to insure the linkage is good and moving properly. If so, then pop the lid and insure the check ball is installed, there are no blockages in the system, and the pump diaphragm is good.
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Unread 07-30-2013, 06:03 AM   #9
Shlomi
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I have a similar problem too, just that the plunger is new and I can see the top of the accelerator pump moving down when
Pumping the throttle and still it won't shoot any fuel. It's like the problem is that the plunger is telescopic so even the pump is pressed down it won't shoot fuel.
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Unread 07-30-2013, 06:38 AM   #10
CJATE
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My shoots fuel just fine, but only after a pump it from the tank to the carb.

I don't think my issue is with pump, I don't think there is fuel to pump.


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Unread 07-30-2013, 08:52 AM   #11
Chipmunk222
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Quote:
Originally Posted by John Strenk View Post
Do you have a mechanical or electric fuel pump?

I had a weak pump on mine and after a few days it would not start because the pump could not pump up enough gas to the carb fast enough with cranking. All the pumping and all the choke wouldn't matter until I got gas to the carb.
It is mechanical and it was changed about a month ago.
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1979 CJ7 AMC 360*T150 3 speed/Dana 20*Moser 1 piece axles*Edlebrock intake manifold/carb*Cooper Stt 35x12.50x15 tires* Black Keystone Wheels*MSD cap, rotor, wires*Rusty's HD Tie Rod and Drag link* Goferit tie rod reversal* Borgeson steering shaft* Sams HD steering box bracket*Tire Carrier Bumper*Skyjacker Nitro N8000 shocks*Mountain Offroad Heavy duty 4 inch shackles* 12,000 lb Badlands Winch with wireless remote*

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Unread 07-30-2013, 09:05 AM   #12
CrawlingForward
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My experience has only been with motorcycles, but wouldn't an issue with starting, but not with running point towards something with the choke? Possibly a cruddy or blocked passage in the carb?
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Unread 07-30-2013, 09:12 AM   #13
hotrod351
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accel pump. if you pour gas into it and it starts, well thats what the accel pump is for. maybe its not squirting enough gas into it. ot you have a major vacuum leak thats requiring a lot of gas poured into it to compensate.
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Unread 07-30-2013, 09:35 AM   #14
John Strenk
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It could be something like this also,



The little pinhole would not pump enough gas, mostly air, to the carb during cranking but after I put some gas in the carb, the faster RPM would pump more gas to carb to keep it running just fine.
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Unread 07-30-2013, 10:59 AM   #15
hp_lovecraft
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When I had this problem a few months ago, it ended up being something weird. In my case, it would start and run for a few seconds. Then die and not restart unless I poured gas into the carb.

The float was sticking. Adding gas to the carb allowed the engine to start, and the vibration from the engine unstuck the float! Took a while to figure out that.
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