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Old 10-09-2012, 05:36 PM   #1 (permalink)
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Holley troubles..

I have a Holley 4150 carb. and I am having an issue with fuel pouring out the vent tube. I even have the fuel float turned down low and it still comes out the vent tube. Any idea why it does this? The fuel pressure is set at 6psi.
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1982 GT
351w(.060), ported & polished heads with 1.94/1.60 valves, 10.3 comp, stealth intake, 274XE cam, Holley 750 dp, Mallory dist., shorty headers, flowmasters, 4:10 gear, c-4 with 3700 stall converter, subframes, electric fan
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Old 10-09-2012, 06:22 PM   #2 (permalink)
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Re: Holley troubles..

Does it always pour out? If so you may have a hunk of crap stuck between the needle and seat. Or maybe a hole in the float.
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Old 10-09-2012, 06:26 PM   #3 (permalink)
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Re: Holley troubles..

drop fuel pressure to 4 psi.
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Old 10-09-2012, 06:31 PM   #4 (permalink)
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Re: Holley troubles..

Quote:
Originally Posted by FEandGoingBroke View Post
drop fuel pressure to 4 psi.

I could do that but it's never been an issue at 6.

The float is one of those (I forget what they call those floats) but it's one of those upgraded floats.(not brass)
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1982 GT
351w(.060), ported & polished heads with 1.94/1.60 valves, 10.3 comp, stealth intake, 274XE cam, Holley 750 dp, Mallory dist., shorty headers, flowmasters, 4:10 gear, c-4 with 3700 stall converter, subframes, electric fan
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Old 10-09-2012, 07:27 PM   #5 (permalink)
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Re: Holley troubles..

Its the o ring around the needle and seat, when you put it in the o ring tore and now fuel just goes around the outside of the assembly flooding the bowl
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Old 10-09-2012, 08:28 PM   #6 (permalink)
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Re: Holley troubles..

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Originally Posted by mustang42782 View Post
Its the o ring around the needle and seat, when you put it in the o ring tore and now fuel just goes around the outside of the assembly flooding the bowl
I never had the needle valve out before. I had a problem last week with fuel coming out around the adjusting screw but I fixed that today with a new set of gaskets. Lucky for me, the kit also came with the "o" ring for the needle/seat. I'm guessing that seal is worn or dirt is stuck down there. The needle assembly just screws out...right?
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1982 GT
351w(.060), ported & polished heads with 1.94/1.60 valves, 10.3 comp, stealth intake, 274XE cam, Holley 750 dp, Mallory dist., shorty headers, flowmasters, 4:10 gear, c-4 with 3700 stall converter, subframes, electric fan
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Old 10-09-2012, 08:55 PM   #7 (permalink)
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Re: Holley troubles..

Yup, remove the lock screw and just turn it out
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Old 10-09-2012, 10:33 PM   #8 (permalink)
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Re: Holley troubles..

Also make sure the float is not fuel soaked (sinking float) (any doubt, just replace it) and the float is adjusted correctly after you put it back together.

You did use a HOLLEY kit, right?
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Old 10-10-2012, 12:22 PM   #9 (permalink)
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Re: Holley troubles..

Quote:
Originally Posted by KULTULZ View Post
Also make sure the float is not fuel soaked (sinking float) (any doubt, just replace it) and the float is adjusted correctly after you put it back together.

You did use a HOLLEY kit, right?
I haven't done anything to it yet, besides replace the needle/seat paper gaskets for the set screw and locknut, but yes, i did use a Holley kit for those. I'm not one to skimp on gaskets. I'm willing to pay a little more for stuff like that.

The float is one of those Nitrophyl types, which I swapped out years ago, so it's not fuel soaked. It must eiter be the needle valve "o" ring or the needle valve itself I guess...
I'm going to check this all out later on.
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1982 GT
351w(.060), ported & polished heads with 1.94/1.60 valves, 10.3 comp, stealth intake, 274XE cam, Holley 750 dp, Mallory dist., shorty headers, flowmasters, 4:10 gear, c-4 with 3700 stall converter, subframes, electric fan

Last edited by 82GT; 10-10-2012 at 12:32 PM.
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Old 10-10-2012, 03:18 PM   #10 (permalink)
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Re: Holley troubles..

Well, I took out the needle/seat and got some old gasket out of it but it STILL does the same thing!. I even put on a new "o" ring. Fuel wants to still spill out the vent tube or out around the float adjusting screw/nut.

Oddly, I noticed that I can turn the lock screw AND adjusting nut at the same time just by turning the screw......it never tightens up. I can tighten the set screw down to the locknut but I can still turn them afterwards (either way) with just a screwdriver...I know that can't be right because the secondary fuel bowl screw is locked tight! What did I do wrong?
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1982 GT
351w(.060), ported & polished heads with 1.94/1.60 valves, 10.3 comp, stealth intake, 274XE cam, Holley 750 dp, Mallory dist., shorty headers, flowmasters, 4:10 gear, c-4 with 3700 stall converter, subframes, electric fan
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Old 10-10-2012, 04:23 PM   #11 (permalink)
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Re: Holley troubles..

You pulled the threads out of the float bowl. time for a new one. Did you get oil pressure back yet?
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Old 10-10-2012, 05:02 PM   #12 (permalink)
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Re: Holley troubles..

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Originally Posted by mustang42782 View Post
You pulled the threads out of the float bowl. time for a new one. Did you get oil pressure back yet?
I have to get the carb fixed before I get back to the oil pressure issue again. I have an idea of what might have cause the oil pressure issue but not the sloppy rocker arms though.

When I replaced the intake gaskets about 2 months ago, I forgot to drain the coolant below the level of the heads, so when I removed the intake some coolant spilled out of the heads and into the lifter galley. It wasn't much (maybe a cup). I knew I had to change the oil afterwards but I'm thinking maybe I forgot to do it. That would explain the oil pressure probably. When I pull the dipstick out, the oil drips off the end pretty easily. It just seems thin. (synthetic 10w-30 weight).

BTW, how would I have managed to pull the threads out of the float bowl?
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1982 GT
351w(.060), ported & polished heads with 1.94/1.60 valves, 10.3 comp, stealth intake, 274XE cam, Holley 750 dp, Mallory dist., shorty headers, flowmasters, 4:10 gear, c-4 with 3700 stall converter, subframes, electric fan
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Old 10-10-2012, 08:04 PM   #13 (permalink)
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Re: Holley troubles..

Those threads are a little fragile, and th eolder the carb, the more brittle they get. Sometimes, it just happens. Iv got a box full of stripped out float bowls somewhere. I don't know why I keep them..LOL..I guess I hope someone will come up with a good repair someday and I'll have the market cornered..
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Old 10-10-2012, 08:24 PM   #14 (permalink)
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Re: Holley troubles..

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Originally Posted by Bikesandfires View Post
Those threads are a little fragile, and th eolder the carb, the more brittle they get. Sometimes, it just happens. Iv got a box full of stripped out float bowls somewhere. I don't know why I keep them..LOL..I guess I hope someone will come up with a good repair someday and I'll have the market cornered..

Can they be re-threaded with a tap and die kit?
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1982 GT
351w(.060), ported & polished heads with 1.94/1.60 valves, 10.3 comp, stealth intake, 274XE cam, Holley 750 dp, Mallory dist., shorty headers, flowmasters, 4:10 gear, c-4 with 3700 stall converter, subframes, electric fan
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Old 10-10-2012, 08:47 PM   #15 (permalink)
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Re: Holley troubles..

Not that I'm aware of, sorry...I'v tried everything to try to repair them and never did have any luck. Whats needed is an oversize needle and seat, then it would be possible to re-drill and tap, but how would Holley make any money doing that?
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