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Tillotson Standard Volume(Single Stack, Gas) Diaphragm Cover
91A-275 Tillotson Gas Diaphragm Cover - Top
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Tillotson Standard Volume(Single Stack, Gas) Diaphragm Cover

Part Number: 91A-275
Online Price: $5.99
91A-275 Tillotson Standard Volume Diaphragm Cover – Gas Single Stack OEM Plate
Availability: In Stock.

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Description

91A-275 Tillotson Standard Volume Diaphragm Cover | Single Stack Gas Pump Plate


The Tillotson 91A-275 Standard Volume Diaphragm Cover, also known as the single stack or gas pump plate, is a genuine OEM component designed for use with standard gasoline-based Tillotson carburetors. This plate sits directly beneath the carburetor body and plays a critical role in regulating fuel delivery.


The 91A-275 cover plate houses the metering diaphragm on one side and the pump diaphragm on the other. It is engineered for standard-volume fuel flow and comes factory-installed on many popular HL, HW, HB, HX, and HM Tillotson carburetors.


Important Compatibility Note:
This diaphragm cover is not compatible with high-volume (double stack / methanol / alky) fuel plates. The fuel pump stacks on standard and high-volume designs are not interchangeable due to their unique internal architecture.


We do not recommend this diaphragm cover for methanol applications or high-displacement gas engines that require increased fuel delivery. Always check your carburetor model and racing rules before ordering or replacing parts.


Key Features:

  • OEM Tillotson Part #91A-275
  • Standard-volume (gasoline) diaphragm cover
  • Also referred to as single stack pump plate
  • Designed for use with metering & pump diaphragms
  • Compatible with many HL, HW, HB, HX, HM, and HD models
  • Not suitable for methanol or double-stack fuel systems
  • Ideal for stock and low-to-mid displacement gas engines


Comes Stock On:

HL-Series: HL-1A, HL-129E, HL-132H, HL-166B, HL-166C, HL-189F, HL-227A, HL-227E, HL-229A, HL-232A, HL-232E, HL-250A–E, HL-274E, HL-292G, HL-293A, HL-293F, HL-299E, HL-334A, HL-334AA, HL-334AB, HL-334WX, HL-334WXA, HL-334WXG, HL-357A–B, HL-360A, HL-383A, HL-384A–B, HL-385A, HL-388A, HL-395A
HW-Series: HW-10A–B, HW-11A–B, HW-12A, HW-17A, HW-22A, HW-23A, HW-27A, HW-30A, HW-31A, HW-32A, HW-33A, HW-34A, HW-35A, HW-43A
HB-Series: HB-10A, HB-11A, HB-12A
HC-Series: HC-102A, HC-103A, HC-112A
HM-Series: HM-1A, HM-2A, HM-12A
HX-Series: HX-10A, HX-12A

FAQ

Q1: What is the 91A-275 Tillotson diaphragm cover used for?
A: This is the standard-volume diaphragm cover (also called a single stack or gas pump plate) used on Tillotson carburetors. It holds the metering and pump diaphragms in place and regulates fuel flow for gasoline-powered engines.


Q2: Can I use this diaphragm cover for methanol setups?
A: No. This cover is not recommended for methanol or high-displacement engines. For methanol, use a high-volume (double stack) diaphragm cover designed for increased fuel delivery.


Q3: Is the 91A-275 plate interchangeable with high-volume (alky) diaphragm covers?
A: No. The standard and high-volume pump plates are not interchangeable. Each uses a unique fuel stack design.


Q4: What carburetors is this part compatible with?
A: It fits a wide range of Tillotson HL, HW, HB, HX, HM, and HC series carburetors. See the product listing for a full list of compatible models.


Q5: How do I know if I have a standard or high-volume plate?
A: Standard volume (single stack) plates like this one are thinner and used on gasoline setups. High-volume (double stack) plates are thicker and designed for methanol or large displacement engines.


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