72 360 Carb Question
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Junior User
Joined: May 2008
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72 360 Carb Question
When I went to Portland Or. to check out my 69, I helped my Brother-in-law with his 72 F-250 with 360. We replaced the heads and new exhaust manifolds.
After running the engine when done, gas was comming up thru the two vent tubes on the two barrel carb. While cleaning the intake manifold I remember tipping the manifold and may have gotten some dirt from the bowl in the needle area so I pulled the top of the carb and cleaned bowl area.
Still after running a minute or so the gas still comes up thru those two small vent tubes and after stopping the engine or flooding out, I noticed a small amount of gas seeping from under the base plate.
The carb is a Checker/Shucks 6mo. old reman. which was operating good before the engine disassemble. Maybe 500 miles or so. Hope it's simple. Can you help?
After running the engine when done, gas was comming up thru the two vent tubes on the two barrel carb. While cleaning the intake manifold I remember tipping the manifold and may have gotten some dirt from the bowl in the needle area so I pulled the top of the carb and cleaned bowl area.
Still after running a minute or so the gas still comes up thru those two small vent tubes and after stopping the engine or flooding out, I noticed a small amount of gas seeping from under the base plate.
The carb is a Checker/Shucks 6mo. old reman. which was operating good before the engine disassemble. Maybe 500 miles or so. Hope it's simple. Can you help?
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
Remove the lid and check the float. Is it an old brass version? Could have pin hole and sinking, thus flooding carb.
Pull the needle out of seat and look for crud or damage to rubber tip of needle.
Another thing is to check the installed height of float. Usually kits come with little scale to set it but you don't have that so you'll have to wing it. Turn the lid over and let the float hang against the needle. For the most part the float should be on a level plane with the top of carb. Usually the top of float is flat, so the gap should be pretty equal between it and lid of carb. If it's not, bend the arm til it is.
Just a few things off the top of my head to check.
Pull the needle out of seat and look for crud or damage to rubber tip of needle.
Another thing is to check the installed height of float. Usually kits come with little scale to set it but you don't have that so you'll have to wing it. Turn the lid over and let the float hang against the needle. For the most part the float should be on a level plane with the top of carb. Usually the top of float is flat, so the gap should be pretty equal between it and lid of carb. If it's not, bend the arm til it is.
Just a few things off the top of my head to check.
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Junior User
Joined: May 2008
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Thanks freightrain,
Even thou the carb was working fine before removing the intake, you think it could be the float?
I will be heading back up there in a week or two. It's a little cooler in Portland than here in Phoenix. Suppose to be 111 today.
Maybe the float got hung up or something. My brother-in-law said he can get another carb for about $170.00, but this one I hope is saveable.
Even thou the carb was working fine before removing the intake, you think it could be the float?
I will be heading back up there in a week or two. It's a little cooler in Portland than here in Phoenix. Suppose to be 111 today.
Maybe the float got hung up or something. My brother-in-law said he can get another carb for about $170.00, but this one I hope is saveable.
Cargo Master
Joined: Sep 2004
Posts: 2,690
Likes: 6
The float floats upward when the bowl fills with gas. Teetering on the other end is the brass needle that is clamped onto the float with some type of spring. The two teeter back and forth letting in gas and then shutting off the flow. When I rebult my carb I didn't put that spring back on that holds everything together. I remember looking at the float thinking "what holds this in place." When I fired it up gas came blowing out just like you explain. So what is happening is that the brass needle is not dropping down to shut off the flow of gas.
Posting Guru
Joined: Nov 2005
Posts: 1,302
Likes: 0
From: Madison, SD
Without the spring, when the fuel comes in it just pushes the needle up and out of the way....with no retainer the float can't pivot and push the needle down into the seat to stop the fuel flow.... Easy fix, if you still have the retainer..... If not, they come in a repair kit, lots cheaper then a new carb anyway....
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Junior User
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I will check the float spring setup first thing when I get back up there.
It makes alot of sense as there is nothing to shut off the flow of gas.
Thanks Qman and Dave for the input
It makes alot of sense as there is nothing to shut off the flow of gas.
Thanks Qman and Dave for the input
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Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
If your retainer float spring is in place. You can just pull your coil wire out with the carb top still off and crank it over enough times to see if it is still flooding.Adjust as needed. Hell you can even start it up but you have to know what your really doing. So you don't catch it on fire. And since you don't! KNOW zip don't start it with out the carb top on. If for some reason you have to much fuel pump pressure it will do the same thing 4-6 psi is idel. So if you put a electric pump the red high out put holley that would mostly be why it's flooding ..my 2cent
orich
orich
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