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Unread 08-09-2009, 01:46 PM   #1
specwarCJ
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Holley Carb turned into a gas fountain?

Ok this is some seriously weird stuff. I have been running this jeep for a month now and everything ran perfectly. The motor just purred without a miss or anything (350Chevy) (holley 600CFM-80475s) I did hookup the electric choke and ran it a couple of times and everything seemed fine.

Today I go out there and for whatever reason the engine was running very rough right out of the gate. I pulled the air cleaner in time to see a pencil size stream of gas coming out of the top of the carburator and basically getting all over everything. Basically it is drowning in its own fuel. Does anybody have an idea what could cause this? I just don't understand why fuel would shoot up through fuel bowl vents. Ha, I bet I am the only CJ with a aftermarket fountain installed.

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Unread 08-09-2009, 01:59 PM   #2
rokcrawler3203
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I don't ever work on carbs, but could it be too much fuel pressure? Are you running a electric fuel pump to a regulator of any kind. I just don't know why it would happen all of a sudden.
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Unread 08-09-2009, 02:05 PM   #3
my-jeep-earl
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It sounds like a stuck float needle valve, check that first. Is it a dual feed or single and are the float valves accessable on the top of the bowls? Is the gas comming from the vent in the Primary (front) or the secondary (rear) brass vertical tube in the main body?
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Unread 08-09-2009, 02:08 PM   #4
specwarCJ
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Quote:
Originally Posted by rokcrawler3203 View Post
I don't ever work on carbs, but could it be too much fuel pressure? Are you running a electric fuel pump to a regulator of any kind. I just don't know why it would happen all of a sudden.

I don't know. I am sure it is the original. Everything else on this 82 CJ7 besided the engine-trans-and transfer case-radiator is all original and rusted all to heck. I put a new fuel filter on a while back and it continued to run great. I don't have a fuel regulator on it. I will check to see if it is an automatic fuel pump. The only adjustment I have made on the carb was hooking up the automatic choke. A month ago I did adjust the fuel in the bowls so that they were just under the weep hole.
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Unread 08-09-2009, 02:09 PM   #5
specwarCJ
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Quote:
Originally Posted by my-jeep-earl View Post
It sounds like a stuck float needle valve, check that first. Is it a dual feed or single and are the float valves accessable on the top of the bowls? Is the gas comming from the vent in the Primary (front) or the secondary (rear) brass vertical tube in the main body?
The gas is periodically shooting out of the front most bowl vent (front meaning the closest to the front of the jeep). Here is a picture of it. http://1970mgr.org/Holley600.gif

And here is a great video of what it looks like except this is somebody elses carb and the fuel shoots higher out of mine. http://www.youtube.com/watch?v=T8G2KQmOZ-Q
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Unread 08-09-2009, 02:12 PM   #6
Fish4it
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Sounds like a stuck float.
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Unread 08-09-2009, 02:12 PM   #7
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Maybe the float is stuck down, which keeps the needle and seat open, and continually fills the bowl, which would eventually shoot out the vent?
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Unread 08-09-2009, 02:23 PM   #8
specwarCJ
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Quote:
Originally Posted by Pacfanweb View Post
Maybe the float is stuck down, which keeps the needle and seat open, and continually fills the bowl, which would eventually shoot out the vent?

That would explain why it is only coming ut of the front vent and not the back. Can and check and adjust without pulling the whole thing off?
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Unread 08-09-2009, 03:09 PM   #9
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Sounds like the float to me. An old mechanic once told me to use a small block of wood and a hammer to break the float free. Put the block of wood up against the bowl, and give it a good smack or two. I didn't believe it would work, but my dad and I used it to break a stuck float in my sisters MC 2100 on her 360.
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Unread 08-09-2009, 04:18 PM   #10
JeepHammer
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Quote:
Originally Posted by specwarCJ View Post
I pulled the air cleaner in time to see a pencil size stream of gas coming out of the top of the carburator and basically getting all over everything. Basically it is drowning in its own fuel. Does anybody have an idea what could cause this? I just don't understand why fuel would shoot up through fuel bowl vents. Ha, I bet I am the only CJ with a aftermarket fountain installed.
Classic signs of something holding the fuel 'Needle' valve off the seat.
Probably something in the lines got into the carb.

With the vehicle OFF,
You can LOOSEN the locking screw off the float level adjuster,
Then use the 'Nut' under the screw to remove the fuel inlet valve and clean it up, re-install it.

If you don't have an 'Avenger' type carb, this is a very good time to install the 'Off Road' needle and seat assembly,
LINK: http://www.summitracing.com/parts/HLY-6-513/

Be VERY careful or you will run the gaskets when you move/remove the adjuster and lock screw.

Take the line off the carb and flush the line (crank the engine) while you are doing the service work,

AND,
Install a proper fuel filter while you are there.


I didn't see any mention of new fuel pump,
But valves in the fuel pump can become inoperative if they are full of crap,
And new fuel pumps in particular can cause pressure problems since they can have bypass valves rust shut, ect.

Electronic pumps are prone to too much fuel without fuel pressure regulators,
So if you run electronic fuel pump, make sure the fuel pressure is below 7 PSI, and 4 or 5 PSI is better for off road vehicles.

Since only ONE of the bowls is spewing fuel, and there is an inlet valve in BOTH bowls, It's like I said,
THIS IS A CLASSIC SIGN OF SOMETHING IN THE FRONT FLOAT BOWL FUEL INLET NEEDLE AND SEAT VALVE.


Since I'm a factory trained Holley tech with over 30 years working on these things,
You just *MIGHT* want to check out what I'm saying...

Last edited by JeepHammer; 08-10-2009 at 06:28 AM..
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Unread 08-09-2009, 04:28 PM   #11
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The day I installed a new DUI HEI distributor, on my first attempt to start the engine, the carb (no air filter on) shot gas up about 3 feet, ran rough as a bugger for 5 seconds, then died.

I made a few changes, and tried it again. Same thing.

I called DUI, and they said to send them the distributor, so that they could test it. It ended up having a bad module, so they replaced it.

It's been fine ever since.

Do you have HEI ignition? If so, you could have a bad module.

Rich
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Unread 08-09-2009, 08:18 PM   #12
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Quote:
Originally Posted by rixcj View Post
The day I installed a new DUI HEI distributor, on my first attempt to start the engine, the carb (no air filter on) shot gas up about 3 feet, ran rough as a bugger for 5 seconds, then died.

I made a few changes, and tried it again. Same thing.

I called DUI, and they said to send them the distributor, so that they could test it. It ended up having a bad module, so they replaced it.

It's been fine ever since.

Do you have HEI ignition? If so, you could have a bad module.

Rich
Why would your dizzy have anything to do with a fuel delivery problem like that? Just curious.
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Unread 08-09-2009, 09:57 PM   #13
carnuck
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The dist being wonky can spark wrong, blow fuel back up through the intake.

As for Holley, it is a hole through which MUCH gas passes!

Electric fuel pumps are NOT stock on these Jeeps. Most run too high of pressure for a carb.
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