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Carb Capers

Keeping That Holley Carburetor In Shape
February, 2009
By Bob Mehlhoff
148 0208 Carb Lead Z
148 0208 Carb 1 Z
Working on fuel lines requires... 
   
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148 0208 Carb 1 Z
Working on fuel lines requires special tools. Remember to use a tubing cutter--never cut a metal fuel line with a hacksaw. Ream out the cut, and add a flare appropriate for the application.
148 0208 Carb 2 Z
Because a flare fitting seals... 
   
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148 0208 Carb 2 Z
Because a flare fitting seals under compression, there is no need to apply thread sealer or Teflon tape to the tube's nut. Teflon tape can work lose and enter the carburetor's fuel system and clog passages.
148 0208 Carb 3 Z
When reinstalling the secondary... 
   
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148 0208 Carb 3 Z
When reinstalling the secondary diaphragm, be certain that the sealing-cork gasket is still in place. If it's not, the vacuum leak will not allow the secondary diaphragm to operate.
148 0208 Carb 4 Z
To prevent the screws from... 
   
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148 0208 Carb 4 Z
To prevent the screws from grabbing the rubber secondary diaphragm during assembly, add a few shots of WD-40 to each screw.
148 0208 Carb 5 Z
Is your carburetor giving... 
   
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148 0208 Carb 5 Z
Is your carburetor giving you idle problems? If so, start with the basics. For most Holley carburetors, the air/fuel mixture screws should first be set to 1-1/2 turns outward before their final adjustment. Always adjust all idle mixture screws evenly.
148 0208 Carb 6 Z
To allow your distributor's... 
   
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148 0208 Carb 6 Z
To allow your distributor's vacuum-advance unit to operate properly, the hose should connect to a ported vacuum source and not direct vacuum. A good test for this is to remove the plug with the engine idling and check for vacuum. There should be none at idle.
148 0208 Carb 7 Z
When wiring the electric... 
   
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148 0208 Carb 7 Z
When wiring the electric choke on a Holley carburetor, run a 12-volt source from a switched terminal. Never connect the choke to the positive side of the coil.
148 0208 Carb 8 Z
An air cleaner not only delivers... 
   
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148 0208 Carb 8 Z
An air cleaner not only delivers clean, undisturbed air but also minimizes the chance of a fire spreading in your engine compartment. Also make sure that the air-cleaner lid does not block or interfere with the carburetor vents. If this happens, stalling can occur.
148 0208 Carb 9 Z
After installing the carburetor,... 
   
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148 0208 Carb 9 Z
After installing the carburetor, check wide-open throttle (WOT) operation. For proper throttle return, install a return spring that is just strong enough to pull the throttle back. Too strong a return spring can cause unnecessary wear to the throttle shaft and bushings.
148 0208 Carb 10 Z
To remove a stubborn fuel... 
   
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148 0208 Carb 10 Z
To remove a stubborn fuel bowl, tap it with a plastic mallet. Using a screwdriver to wedge the bowl away from the carburetor body could create a permanent leak.
148 0208 Carb 11 Z
Be careful during reassembly... 
   
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148 0208 Carb 11 Z
Be careful during reassembly because over-tightening the carburetor can strip threads.
148 0208 Carb 12 Z
When checking accelerator-pump... 
   
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148 0208 Carb 12 Z
When checking accelerator-pump operation, remember there should be no clearance between the actuating-lever screw and the diaphragm lever at idle. When adjusted properly, the diaphragm lever should be able to move enough beyond WOT to accommodate a 0.015-0.020-inch feeler gauge as shown in the photo.
148 0208 Carb 13 Z
All gasket surfaces should... 
   
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148 0208 Carb 13 Z
All gasket surfaces should be cleaned carefully with a wire brush to remove old material.
148 0208 Carb 14 Z
Use a wide-blade screwdriver... 
   
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148 0208 Carb 14 Z
Use a wide-blade screwdriver or a jet-removal tool when replacing a jet. The wrong-sized screwdriver could damage the jet's orifice and affect the flow.
148 0208 Carb 15 Z
Work in a clean environment... 
   
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148 0208 Carb 15 Z
Work in a clean environment to prevent debris from entering the open carburetor, and remember to blow out all passages with air before reassembly.
Ted's Carburetor Service
45029 Trevor Ave., No. 106
Lancaster
CA  93534
Holley Performance Products
Bowling Green
KY
Tech and Info: 270/7

holley.com

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