Holley float adjustment
#2468267
03/18/18 08:07 PM
03/18/18 08:07 PM
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Joined: Dec 2004
Posts: 733 Northern Virginia
Moparmaniacc
OP
super stock
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OP
super stock
Joined: Dec 2004
Posts: 733
Northern Virginia
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My Holley 40458 is giving trouble. I couldn't adjust the secondary float level (counterclockwise to raise level) to be high enough to be just below the sight hole. Finally I got tired of trying to adjust it and took the back bowl off. The float was adjusted all the way against the bottom! So I turned it upside down, adjusted it so the float was level with the bottom, put it back together, and took it for a ride. Now the level is way too high. So I loosened the screw and turned the nut clockwise, again and again and again, and still the level is too high. What is going on? I could be wrong, but the nut never feels like it's engaging the needle to turn it. Why didn't my dry adjustment work? Did I bend the float tang?
Last edited by Moparmaniacc; 03/18/18 08:09 PM.
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Re: Holley float adjustment
[Re: Moparmaniacc]
#2468286
03/18/18 08:47 PM
03/18/18 08:47 PM
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Joined: Dec 2007
Posts: 18,165 Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,165
Mass
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This float is yellowish, almost orange, plastic float. No fuel in it. Hollow float or solid plastic?
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Re: Holley float adjustment
[Re: Moparmaniacc]
#2468305
03/18/18 09:15 PM
03/18/18 09:15 PM
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Joined: Jan 2003
Posts: 26,470 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 26,470
Rio Linda, CA
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I could be wrong, but the nut never feels like it's engaging the needle to turn it. Why didn't my dry adjustment work? The threads in the bowl might be stripped which would explain why it won't hold an adjustment or the needle valve isn't shutting off the fuel flow.
The INTERNET, the MISinformation superhighway
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Re: Holley float adjustment
[Re: Moparmaniacc]
#2468306
03/18/18 09:15 PM
03/18/18 09:15 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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You have to adjust the secondary side very slow. Especially lowering it. The secondary bowl uses fuel at a much slower rate.
If I'm in the same spot as you, I turn the engine off and drain a little fuel out of the bowl through the fuel screw. Enough so it's below the hole. Then turn the adjusting screw 1/2-3/4 turn down and start it again.
If it's still high, repeat. If it's low, adjust it up very slow and you'll get it.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Holley float adjustment
[Re: Moparmaniacc]
#2468317
03/18/18 09:40 PM
03/18/18 09:40 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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The threads are not stripped, the nut has 2 flat spots in it. When it falls down too far, then the flat spots dont engage.
Silly question, is CW and CCW opposite directions from front to rear bowl? Same front to rear.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Holley float adjustment
[Re: dogdays]
#2468659
03/19/18 05:04 PM
03/19/18 05:04 PM
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Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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There's nothing wrong with bending the tab if you can't move the seat far enough to set fuel level.
R. Yep,that is an easy fix,all you need do is run the needle/seat in until you have about 1/16" exposed above the bowl,bend the tab until top of float is parallel with bowl and you will have all the adjustment you need up or down to get the correct float level.
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Re: Holley float adjustment
[Re: Moparmaniacc]
#2468775
03/19/18 09:11 PM
03/19/18 09:11 PM
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Joined: Feb 2007
Posts: 5,080 organ
maximum entropy
master
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master
Joined: Feb 2007
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organ
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be sure to check your fuel pressure, also. try another needle/ seat assy. my favorite abbreviation, fwiw- assy. i always feel like i'm getting away with something. assy.
for what is the good life if not doing things thoughtfully?
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Re: Holley float adjustment
[Re: Moparmaniacc]
#2468928
03/20/18 03:34 AM
03/20/18 03:34 AM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,719
Bend,OR USA
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Found a piece of gasket between needle and seat. Arghhh! Good find Easy fix huh
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Holley float adjustment
[Re: Moparmaniacc]
#2472555
03/26/18 11:44 PM
03/26/18 11:44 PM
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Joined: Dec 2004
Posts: 733 Northern Virginia
Moparmaniacc
OP
super stock
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OP
super stock
Joined: Dec 2004
Posts: 733
Northern Virginia
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The gas is pouring from between the float setter hex and the adjusting screw, but - that's just the path of least resistance. The real problem is the bowl is too full of gas - no matter how much I adjust the float it doesn't make any difference. If I open the secondary sight screw it pours out there too. My best guess at this point is gas is pouring out a small hole in the gasket between the secondary metering block and the metering plate that screws to the block. My other theory is that one of the screws (not a hex screw, not like any screw I've ever seen) that holds the metering plate was loose, and gas is seeping past that screw. Either a bad gasket or a loose screw would render float adjustment useless, right? I gotta wait to find out if I'm right, 'cuz I couldn't take the gasket off in one piece, and had to order another one. Bigcar, you may be right, but remember I swapped in a whole new secondary bowl including the needle valve and the seat, so that would mean I had two bad needle and seats....not impossible, but not likely either.
Last edited by Moparmaniacc; 03/27/18 12:08 AM.
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