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Holley Accelerator Pump Discharge Nozzles
Holley Accelerator Pump Discharge Nozzles

Holley Accelerator Pump Discharge Nozzles

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Holley Accelerator Pump Discharge Nozzles
Holley Accelerator Pump Discharge Nozzles
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Part # 427121
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A good selection of pump discharge nozzle sizes is indispensable to the proper tuning of the accelerator pump system. The nozzle hole size determines the rate of fuel discharge. A larger hole will "shoot" the fuel at a faster rate with less pressure than a smaller hole. Sizes are stamped on each nozzle. For example the number "31" indicates the nozzle hole size is .031".

Includes two nozzles and four nozzle gaskets. 

The two styles offered are Tube Type (121-40, 121-42, and 121-45 also include 2 hollow nozzle screws) and Straight Type.


The "SIZE" drop down box allows you to choose what style and size you wish to purchase. 

Tube Type
427121-25  Tube Type Nozzle0.025" 
427121-28  Tube Type Nozzle 0.028"
427121-31  Tube Type Nozzle 0.031" 
427121-35  Tube Type Nozzle 0.035"
427121-37  Tube Type Nozzle 0.037" 
427121-40  Tube Type Nozzle 0.040"  w/ hollow nozzle screw
427121-42  Tube Type Nozzle 0.042"  w/ hollow nozzle screw
427121-45  Tube Type Nozzle 0.045"  w/ hollow nozzle screw

tube Type Nozzle sizes .040” and larger include a hollow nozzle screw.

Straight Type
427121-125  Straight Type Nozzle .025"
427121-128  Straight Type Nozzle .028"
427121-131  Straight Type Nozzle .031"
427121-132  Straight Type Nozzle .032"
427121-135  Straight Type Nozzle .035"
427121-137  Straight Type Nozzle .037"
427121-140  Straight Type Nozzle .040"
427121-142  Straight Type Nozzle .042"
427121-145  Straight Type Nozzle .045"

Some parts are not legal for use in California or other states with similar laws/regulations

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