#2426686 - 12/31/17 06:14 PM
Holley float level doesn't seem to change
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top fuel
Registered: 11/10/05
Posts: 1834
Loc: San Angelo, Texas, U.S.A.
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I recently replaced the secondary bowl on my Holley 850 DP, and everything was going smoothly until I had everything back together and attempted to set the float level. The gas level seemed to be near the top of the sight window, and turning the adjusting nut seemed to have no effect. I took the bowl off to make sure that turning the adjusting nut would raise/lower the needle and seat, and that raising/lowering the needle and seat would raise/lower the float, and everything seemed OK. But when I put the bowl back on and fired up the engine, I had the same issue.
Any ideas what the issue might be? Bad needle and seat, maybe?
Thanks for any help, and happy new year.
_________________________
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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#2426743 - 12/31/17 07:16 PM
Re: Holley float level doesn't seem to change
[Re: 1968RR]
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Slowride
Registered: 02/02/05
Posts: 12554
Loc: PA.
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I had a bad issue this Summer and it turned out my floats were bad. I run alcohol but then again most pump gas has alcohol in it now. Mine lasted 3 years. Changed out the floats and all is well.
_________________________
1970 Duster Edelbrock headed 408 6.143@110.89 mph 9.73@135.05 mph shifting at 6700 RPM 422 Indy headed small block 6.001@113.27mph 9.44@138.23  Untitled by John Cadamore, on Flickr
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#2426803 - 12/31/17 08:03 PM
Re: Holley float level doesn't seem to change
[Re: pittsburghracer]
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top fuel
Registered: 11/10/05
Posts: 1834
Loc: San Angelo, Texas, U.S.A.
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I had a bad issue this Summer and it turned out my floats were bad. I run alcohol but then again most pump gas has alcohol in it now. Mine lasted 3 years. Changed out the floats and all is well. That's possible. The old bowl had a sight plug, instead of a sight window, and I haven't checked the float level in a while. I'll try installing a new float and see if that helps.
_________________________
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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#2426814 - 12/31/17 08:14 PM
Re: Holley float level doesn't seem to change
[Re: 1968RR]
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Circle Track
Registered: 11/20/03
Posts: 33349
Loc: Lincoln Nebraska
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what was wrong with the old float bowl? any chance of subbing it back in for a quick test?
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live every 24 hour block of time like it's your last day on earth
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#2426885 - 12/31/17 10:12 PM
Re: Holley float level doesn't seem to change
[Re: 1968RR]
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Registered: 09/17/14
Posts: 1913
Loc: Washington
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I recently replaced the secondary bowl on my Holley 850 DP, and everything was going smoothly until I had everything back together and attempted to set the float level. The gas level seemed to be near the top of the sight window, and turning the adjusting nut seemed to have no effect. I took the bowl off to make sure that turning the adjusting nut would raise/lower the needle and seat, and that raising/lowering the needle and seat would raise/lower the float, and everything seemed OK. But when I put the bowl back on and fired up the engine, I had the same issue.
Any ideas what the issue might be? Bad needle and seat, maybe?
Thanks for any help, and happy new year. If it's the secondary side it moves very little fuel while running. Lower the float level a turn and a half down. Pull a bottom screw and drain off fuel until,it's below the window. Put the screw back in and start the engine. Hopefully the level,is low enough so you can raise it up and sneak up on 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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#2426909 - 12/31/17 11:25 PM
Re: Holley float level doesn't seem to change
[Re: RapidRobert]
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top fuel
Registered: 11/10/05
Posts: 1834
Loc: San Angelo, Texas, U.S.A.
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what was wrong with the old float bowl? any chance of subbing it back in for a quick test? A few years back the threads for the fuel line got stripped on the primary bowl, so I replaced it with a new aluminum bowl. The sight plug recently started to weep on the secondary and I couldn't get it to stop so I decided to replace the original zinc with an aluminum bowl so that it matched the front. Admittedly, there could be something I'm missing, but I don't think that the bowl is the issue. It's worth a shot, though...
_________________________
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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#2426984 - 01/01/18 07:53 AM
Re: Holley float level doesn't seem to change
[Re: 1968RR]
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Circle Track
Registered: 11/20/03
Posts: 33349
Loc: Lincoln Nebraska
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^^^ agreed, tho the part change that preceded the onset is a first suspect but yes the needle/seat is a likely candidate (& cheap to replace). As said I would drain it/lower the float way down & see how high it fills up. It is somewhat common for needle/seats to flood for a bit when that area has been opened up (not sure why), maybe dirt broken loose when the fuel rushes forward to take up the empty volume, maybe the needle clocking changes & it has worn a slightly less than perfect circumferential seal. Just thinking out loud. Holler how it turns out
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live every 24 hour block of time like it's your last day on earth
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#2427175 - 01/01/18 12:59 PM
Re: Holley float level doesn't seem to change
[Re: 1968RR]
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I Live Here
Registered: 12/10/07
Posts: 15497
Loc: Mass
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what was wrong with the old float bowl? any chance of subbing it back in for a quick test? A few years back the threads for the fuel line got stripped on the primary bowl, so I replaced it with a new aluminum bowl. The sight plug recently started to weep on the secondary and I couldn't get it to stop so I decided to replace the original zinc with an aluminum bowl so that it matched the front. Admittedly, there could be something I'm missing, but I don't think that the bowl is the issue. It's worth a shot, though... Are you transferring the same old float into the new bowl?, if so?, is it a black plastic?... If so, replace the float with a brass equivalent, as the black plastic ones absorb fuel, become weighted, thus telling the needle seat to continue delivering fuel, resulting in bowl flooding or run over being pulled into the secondarys causing flooding ragged idle conditions...DAMHIK
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#2428555 - 01/03/18 07:58 PM
Re: Holley float level doesn't seem to change
[Re: 1968RR]
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top fuel
Registered: 11/10/05
Posts: 1834
Loc: San Angelo, Texas, U.S.A.
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Pittsburghracer had it right: the culprit was a bad float (not the black plastic kind, but the old-style brass type). As I said, I haven't checked the float level in years and the old bowl had a sight plug, rather than a sight window, so who knows how long the float's been bad. Thanks for the help! 
_________________________
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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#2428578 - 01/03/18 08:22 PM
Re: Holley float level doesn't seem to change
[Re: 1968RR]
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mopar
Registered: 03/30/05
Posts: 565
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Maybe to much fuel pressure and the floats can't handle the pressure and the floats cant maintain the fuel level that's if the floats are good as was mentioned as it could be a bad float.
Edited by fury4speed (01/03/18 08:23 PM)
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#2428598 - 01/03/18 08:37 PM
Re: Holley float level doesn't seem to change
[Re: 1968RR]
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Slowride
Registered: 02/02/05
Posts: 12554
Loc: PA.
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Pittsburghracer had it right: the culprit was a bad float (not the black plastic kind, but the old-style brass type). As I said, I haven't checked the float level in years and the old bowl had a sight plug, rather than a sight window, so who knows how long the float's been bad. Thanks for the help! Glad I could help. I know I chased my tail for awhile finding it to be the issue with my car
_________________________
1970 Duster Edelbrock headed 408 6.143@110.89 mph 9.73@135.05 mph shifting at 6700 RPM 422 Indy headed small block 6.001@113.27mph 9.44@138.23 Untitled by John Cadamore, on Flickr
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