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Tillotson High Volume(Double Stack, Alky)Fuel Pump Body Screw
15B-343 Tillotson Alky/Double Stack Fuel Pump Body Screw
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Tillotson High Volume(Double Stack, Alky)Fuel Pump Body Screw

Part Number: 15B-343
Online Price: $1.69
15B-343 OEM Tillotson High Volume (Double Stack) Fuel Pump Screw
Availability: In Stock.

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Description

15B-343 Tillotson OEM High Volume Fuel Pump Body Screw (Double Stack / Alky)


Extra-Long Screw for Double Stack Pump Plates | Designed for Methanol Conversions | Fits Select HL & HR Models

The 15B-343 Tillotson OEM Fuel Pump Body Screw is specifically designed for high-volume (double stack) fuel pump plate setups—commonly referred to as alky stacks due to their use in methanol (alcohol) conversions.


This screw is longer than the standard single-stack screw to accommodate the additional plate required in high-performance or alcohol-fueled setups. You'll need six screws per carburetor to properly secure the fuel pump plates to the body.


Key Features:

  • OEM Part #15B-343
  • Designed for high-volume (alky/double stack) fuel pump setups
  • Longer length accommodates double plate assemblies
  • Required when converting to methanol (alky) fuel systems
  • Precision-machined for Tillotson carburetors
  • Sold individually (6 required per carburetor)


Installation Warning:

Do not overtighten. Tillotson carburetor bodies are made of soft aluminum, and overtightening can strip threads and permanently damage the body. Tillotson does not offer replacement bodies, so thread care is critical.


Methanol Conversion Tip:

If you're converting your carburetor to methanol (alky), you'll need the following:

  • High Volume Pump Plate Kit (Double Stack)
  • 15B-343 screws (x6)
  • New gasket/diaphragm kit (P6-MDG)
  • Or full rebuild kit (P8-MRK)


Fitment Compatibility:

The 15B-343 screw fits the following Tillotson carburetors equipped with high-volume (double stack) fuel pump plates:

HL-304WX, HL-304WXA, HL-314F, HL-314G, HL-334WXA, HL-339A, HL-341A, HL-342A, HL-348A–E, HL-355A–E, HL-360B, HL-360C, HL-380A, HL-380B
HR-181B, HR-184A, HR-190A, HR-191C, HR-191G, HR-196A

Always confirm your carburetor’s configuration before purchasing. High-volume setups require these longer screws for proper plate compression and sealing.


Perfect For:

  • Alcohol-fueled racing engines
  • High-performance 2-cycle or 4-cycle builds
  • Converting standard carburetors to alky (methanol)
  • Replacing stripped, damaged, or missing pump body screws


FAQ

Q1: What is the 15B-343 screw used for?
A: It's an OEM Tillotson screw used to secure high-volume (double stack) fuel pump plates to the carburetor body, typically in methanol (alky) fuel setups.


Q2: How many screws are needed per carburetor?
A: You will need six 15B-343 screws to secure all fuel pump plate positions on a double stack configuration.


Q3: Can I use this screw for a standard (gas) single stack?
A: No. This screw is too long for standard single-stack setups and may cause poor sealing or damage. Use 15C-51 for standard gas plates.


Q4: What carburetors are compatible with the 15B-343?
A: It fits several HL and HR models configured for double stack plates, including HL-304WX, HL-334WXA, HL-355E, HL-360C, HR-191G, and more.


Q5: What else do I need for an alky conversion?
A: You’ll also need:

  • Double stack pump plates
  • Gasket/diaphragm kit (P6-MDG)
  • Or full rebuild kit (P8-MRK)
  • Six 15B-343 screws


Q6: What happens if I overtighten these screws?
A: Overtightening can strip the soft aluminum carb body, permanently damaging it. Tillotson does not offer replacement bodies, so use caution during installation.

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