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09-02-2008, 02:34 PM
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#1
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Join Date: Mar 2008
Location: Shreveport Louisianna Barksdale AFB
Posts: 1,415
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Carb problems
Alrite guys im in need of some advice yet again.
Im having some problems with the carb I put on my car. Its a holley 3310-2 750 vacuum secondaries carb. I believe the power valve is blown and thats causing some problems but my major concern lies in the secondaries.
As soon as gas gets pumped through the fuel line into the secondaries it comes spewing out of the vent. It gushes out non stop untill you shut it down. The main side of the carb is fine and I had a buddy's dad set the floats twice to make sure it wasnt that. Tho one float is metal and the other is plastic dont know if that means anything tho.
What do you guys think any advice would be appreciated.
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USAF Jet Propulsion Specialist
 1985 383 Camaro-nothing special I promise 
2000 NBM z28-also nothing special
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09-02-2008, 03:12 PM
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#2
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Join Date: Jan 2007
Posts: 5,623
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whats your fuel pressure set at...you may be pushing too much or your flow rate may be too high
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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09-02-2008, 03:42 PM
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#3
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12 Second Club
Join Date: Aug 2004
Location: West Milford
Posts: 8,373
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i had one float full of fuel... was making it overflow on one side only
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09-02-2008, 03:48 PM
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#4
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NJFBOA Co-Founder
Join Date: Jul 2004
Location: All up in your kool aid!
Posts: 12,235
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Look to see if the floats are sticking open in the bowl.
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09-02-2008, 08:38 PM
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#5
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Join Date: Mar 2008
Location: Shreveport Louisianna Barksdale AFB
Posts: 1,415
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What do you mean by sticking open in the bowls? Fuel pressure is between 6/7.
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USAF Jet Propulsion Specialist
1985 383 Camaro-nothing special I promise
2000 NBM z28-also nothing special
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09-02-2008, 08:42 PM
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#6
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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basically the float opens & closes the fuel inlet - if it sticks open, fuel floods the bowl
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09-02-2008, 09:58 PM
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#7
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.
Join Date: Feb 2006
Posts: 1,385
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yep as was said above the float valve might be set incorrect or it is dirty, both will over flow the bowl through the vent tube, first you need to stop the problem take off the bowl and clean it with carb spray THAN to set the float level correctly -- if fuel is coming out of it the front you can take the side screw out on the side of the float bowl and adj the float level just to the bottom of the screw hole threads that will set the fuel level at the correct setting ---- NOTE car must be flat and level and running to do this setting if it has a block fuel pump or an electric this is the correct way to set the level in the bowl ----- their is no power valve in the rear of a vacuum carb only a low performance double pumper, and if the power valve is BLOWN out than the car will run real rich and act like its on choke with no high idle speed, sooo you should first clean and try to set the float level that will at least get you in the ball park CAUTION buy a Holley carb book and read it Because if you screw it up you will light the car of fire - the books show a tool to set the level but all the drag guys use the run method to bottom of screw hole -- jz
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09-02-2008, 10:58 PM
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#8
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Join Date: Mar 2008
Location: Shreveport Louisianna Barksdale AFB
Posts: 1,415
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Thanks im going to guy a new float and power valve just incase and new gaskets. Then have a buddy's dad(very knowledgeable of holleys) help me set the float level as described.
__________________
USAF Jet Propulsion Specialist
1985 383 Camaro-nothing special I promise
2000 NBM z28-also nothing special
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09-03-2008, 08:05 AM
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#9
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Hippy Mod, Bergermeister Meisterberger, Moderator
Join Date: Aug 2004
Location: Ewing
Posts: 6,216
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This carb was new, wasn't it? Do you have some form of inline filter or filter in the carb inlet fittings? You may have some debris in your tank that is getting through and holding the needle open. If it was a rebuilt carb, somebody may have put the float spring on the wrong way(don't ask me how I know  ) and that can cause it to sink and fuel to shoot through the vent tube.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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09-05-2008, 11:34 PM
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#10
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Join Date: Mar 2008
Location: Shreveport Louisianna Barksdale AFB
Posts: 1,415
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It is used Jeff. Float spring is in the correct way, tho it has a little slack. The float it self doesnt have any holes in it or anything either.
Im getting a renew kit from holley and rebuilding this puppy.
New diaphram, secondairy cams. power valve. needle and seats, ect ect. & ill pick up a new float while im at it.
I hope that helps to solve my issue.
__________________
USAF Jet Propulsion Specialist
1985 383 Camaro-nothing special I promise
2000 NBM z28-also nothing special
Last edited by Jersyboyy; 09-05-2008 at 11:34 PM.
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