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Tillotson High Volume (Double Stack, Alky) Fuel Pump Diaphragm
237-154 Tillotson Alky (Methanol) Fuel Pump Diaphragm
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Tillotson High Volume (Double Stack, Alky) Fuel Pump Diaphragm

Part Number: 237-154
Online Price: $2.72
Tillotson 237-154 High Volume (Double Stack, Alky) Fuel Pump Diaphragm
Availability: In Stock.

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Description

Tillotson 237-154 High Volume (Double Stack, Alky) Fuel Pump Diaphragm


The Tillotson 237-154 High Volume Fuel Pump Diaphragm is the core pumping diaphragm used in high-performance, double-stack (alky) Tillotson carburetors. Designed to deliver maximum fuel flow, this diaphragm is a critical component for engines running on methanol or other high-demand applications.


Unlike standard single-stack designs, the double-stack configuration separates the fuel pump diaphragm from the fuel inlet/check valve diaphragm. This allows for increased fuel volume capacity, made possible by the additional stack plate and specialized design—ideal for racing and methanol-fueled engines.


This diaphragm is often referred to as the “snake skin” diaphragm due to its textured, woven appearance. Constructed from Polytetrafluoroethylene (PTFE, Teflon®), it offers superior fuel resistance and durability under extreme conditions. While many OEM Tillotson carburetors use clear Mylar® (PET) diaphragms, this PTFE version is a preferred upgrade for performance builds.


Methanol conversions typically require upgrading to high volume pump stacks, and the 237-154 is essential for that setup. To ensure optimal performance and reliability, we strongly recommend purchasing the complete EC Pro Gasket Set or Rebuild Kit when converting a gas carburetor to methanol.


OEM-Compatible Tillotson Models Include:
HL-304WX, WXA, HL-314F & G, HL-334WXA, HL-339A, HL-341A, HL-342A, HL-348A, B, C, D, E, HL-355A, B, C, D, E, HL-360B, C, HL-380A, B, HR-181B, HR-184A, HR-190A, HR-191C, HR-191G, HR-196A, and other double-stack high volume Tillotson carburetors.


Key Features:

  • High Volume Double Stack Design for increased fuel delivery
  • Durable PTFE Construction (“Snake Skin”) for improved chemical resistance and longevity
  • Essential for Methanol Conversions and high-performance setups
  • OEM fitment for a wide range of Tillotson HL and HR Series Carburetors
  • Recommended for use with EC Pro Gasket or Rebuild Kits for proper conversion

FAQ

Q1: What does the Tillotson 237-154 fuel pump diaphragm do?
A1: The 237-154 diaphragm is the main pumping component in high-volume Tillotson carburetors. It delivers fuel from the tank to the engine by responding to crankcase pulses, critical for high-performance and methanol-fueled applications.


Q2: What makes this diaphragm “high volume” and “double stack”?
A2: “High volume” refers to the diaphragm’s ability to move more fuel, and “double stack” means the fuel pump and check valve diaphragms are separate. This setup increases flow capacity—ideal for racing and methanol use.


Q3: What is the diaphragm made of?
A3: It’s made of Polytetrafluoroethylene (PTFE, Teflon®), known as the “snake skin” diaphragm for its distinctive texture. PTFE provides superior resistance to fuel and heat, making it ideal for demanding engine environments.


Q4: Is this diaphragm suitable for methanol (alky) fuel setups?
A4: Yes. The 237-154 is specifically designed for methanol conversions and high-demand fuel systems. It pairs perfectly with high-volume pump stacks found in racing carburetors.


Q5: Do I need any other parts to complete a methanol conversion?
A5: Yes. We highly recommend purchasing a complete EC Pro Gasket Set or Rebuild Kit to ensure all components are methanol-compatible and function together as a system.


Q6: What carburetors are compatible with the 237-154 diaphragm?
A6: This diaphragm fits multiple Tillotson HL and HR double-stack models, including: HL-304WX, HL-314F/G, HL-334WXA, HL-348A–E, HL-355A–E, HL-360B/C, HL-380A/B, HR-181B, HR-184A, HR-190A, HR-191C/G, HR-196A, and more.

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