carb issue
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New User
Joined: Dec 2011
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carb issue
hi i could use some help, i have a 351 modified radical performance cam, flowtech headers weiand four barrel intake and a holley 600 cfm carb, it was flooding and loading up i figured out it needed to be rejected after i did this now it stalls and falls on its face around 2500 rpm im going to put the stock jets back in and see if that helps.
the carb is PART #: 0-80457S add 65 jets in it to start with any ideas would help i think i might of went to small on the jets
the carb is PART #: 0-80457S add 65 jets in it to start with any ideas would help i think i might of went to small on the jets
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Please, please, PLEASE...next time you post, use punctuation and general sentence structure so that people can actually read what you're trying to say.
"Flooding" and "loading up" aren't specific symptoms; they're a summary of what you believe to be the problem. What are the actual symptoms? When you say flooding, where is the fuel actually coming from? The bowl vents? Is it pooling in the intake manifold? What does "loading up" mean - what is actually happening?
Do you mean "rejetted" and not "rejected?" What lead you to believe you needed to do this? Jetting is not the difference between flooding and not flooding. How are the symptoms different between now and when you rejetted the carburetor? What specifically did you change?
Try again.
"Flooding" and "loading up" aren't specific symptoms; they're a summary of what you believe to be the problem. What are the actual symptoms? When you say flooding, where is the fuel actually coming from? The bowl vents? Is it pooling in the intake manifold? What does "loading up" mean - what is actually happening?
Do you mean "rejetted" and not "rejected?" What lead you to believe you needed to do this? Jetting is not the difference between flooding and not flooding. How are the symptoms different between now and when you rejetted the carburetor? What specifically did you change?
Try again.
Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
Flooding has nothing to do with jet size. You need to get the flooding fixed before attempting to tune your carb (which you absolutely need to do).
Your problem could be caused by three things:
1) Incorrectly set float height.
2) Stuck open needle due to a gunked up needle/seat.
3) Excessive fuel pressure forcing the needle open and flooding the carb.
Holley carburetors generally handle higher fuel pressure better than Edelbrocks do, but you still may need a regulator. If you have trouble getting the float height properly, install a fuel pressure regulator and dial down the pressure to around 5.5psi.
Your problem could be caused by three things:
1) Incorrectly set float height.
2) Stuck open needle due to a gunked up needle/seat.
3) Excessive fuel pressure forcing the needle open and flooding the carb.
Holley carburetors generally handle higher fuel pressure better than Edelbrocks do, but you still may need a regulator. If you have trouble getting the float height properly, install a fuel pressure regulator and dial down the pressure to around 5.5psi.
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New User
Joined: Dec 2011
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first off loading up is a term i am a mechanic by trade and am just stumped looking for another actual mechanics opinion, second loading up means when u are driving the motor gets to much fuel and floods out, there for why i rejetted the carb also it is jetted for sea level i am not at sea level i am on the top of the rocky mountains 8,000 feet above sea level holley recommends reducing jets 1 size for every 2,000 feet in elevation
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New User
Joined: Dec 2011
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i am not impressed with this carb i should have rebuilt my old one, i am just stumped right now at what the problem is
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Lead Driver
Joined: Dec 2012
Posts: 7,870
Likes: 47
From: Tennessee
Apparently it is not fine 
. How about internal leaks , seen that a lot . Fuel going where it ain't suppose to .
. How about internal leaks , seen that a lot . Fuel going where it ain't suppose to .
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New User
Joined: Dec 2011
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internal leaks are possible but with it being a new carb how would that happen but more important how do i discover this issue, further more with the stock jets it blows black smoke out the tailpipes, an indication of over fueling as i remember it, unfortanatley i dont get to deal with these old vehicles anymore with this new obd 1 and 2 junk
Lead Driver
Joined: Dec 2012
Posts: 7,870
Likes: 47
From: Tennessee
I worked at a parts house years ago and saw many bad carbs out of the box . Totally dissasembel and closely inspect all parts for cracks , improper machining , poor castings , missing components .
Tuned
Joined: Feb 2013
Posts: 418
Likes: 37
Soich meter
After you find or correct any float/leak problems, Install a stoich meter.
Auto Meter 7178 Auto Meter C2 Gauges
You will find it invaluable for tuning.
chris
Auto Meter 7178 Auto Meter C2 Gauges
You will find it invaluable for tuning.
chris
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
first off loading up is a term i am a mechanic by trade and am just stumped looking for another actual mechanics opinion, second loading up means when u are driving the motor gets to much fuel and floods out, there for why i rejetted the carb also it is jetted for sea level i am not at sea level i am on the top of the rocky mountains 8,000 feet above sea level holley recommends reducing jets 1 size for every 2,000 feet in elevation
Running rich and flooding out are two completely different things, with different symptoms and different troubleshooting paths. I'm not the first person in this thread to say that it makes no sense to change out jets if you're flooding out. If you're actually a mechanic then you should know that already. It makes sense to consider jetting if you're running rich, but since you have yet to tell us what your truck is actually doing, we have no way of knowing which one is actually happening.
Clearly the others here have more patience and are willing to re-read your posts multiple times, because I can barely understand anything you're saying.
Senior User
Joined: Feb 2013
Posts: 266
Likes: 0
From: Idaho
did it backfire at any point? Your power valve might be blown. floats out of adjustment or stuck, accelerator pump not functioning correctly...etc next is ignition system weak...you need to find out if you have good spark or not.
Elder User
Joined: Mar 2013
Posts: 559
Likes: 0
From: In Hastings Delton area
If its a flooding problem check your float levels check you needle and seat check your power valve. If its loading up it could be because its flooding out getting too much gas.Get your flooding out problem fixed first then worry about the loading up problem check choke first see if its working properly
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