Standard PR131T Fuel Injection Pressure Regulator

Fuel Pressure Regulator Diaphragm Kit

The Standard PR131T fuel injection pressure regulator diaphragm kit is built for direct replacement service on a wide range of GM and related applications. It includes the diaphragm assembly, gasket, foam rings, and alignment rods needed to service the regulator with a proper sealing fit.

Key Features

• Direct-mount fuel injection pressure regulator diaphragm kit
• Includes diaphragm assembly, gasket, 1/8" H foam ring, 5/16" H foam ring, and 2 alignment rods
• Made from quality components for dependable operation
• Compatible with a broad range of Chevrolet, GMC, Cadillac, Pontiac, Buick, Oldsmobile, Isuzu, and related vehicles
• Standard PR131T replacement for fuel pressure regulator diaphragm service

Detailed Description

Standard PR131T is a fuel injection pressure regulator diaphragm kit for service work on many 1980s and 1990s GM platforms, including Chevrolet Astro, S10, Blazer, Caprice, Camaro, and GMC Safari, Sonoma, Jimmy, and Yukon applications. It is also listed for Cadillac, Pontiac, Buick, Oldsmobile, and Isuzu models across the covered years. This kit is intended for direct mounting and provides the core sealing and diaphragm components needed when rebuilding the regulator assembly.

This part cross-references Gates 21025 and 21732 for the same application. Standard PR131T is also referenced under Standard Ignition PR131.

Common Repair Uses

• Fuel pressure regulator diaphragm wear
• Fuel pressure loss at the regulator
• Rough idle caused by regulator sealing issues
• Fuel odor from a damaged diaphragm or gasket
• Driveability problems tied to unstable fuel delivery

Installation Notes and Tips

Install as a direct replacement on the regulator assembly and verify the sealing surfaces are clean before reassembly. Use the supplied alignment rods to help position the diaphragm components correctly, and replace any worn foam rings or gasket surfaces during service. Confirm vehicle-specific fitment before ordering, especially on Chevrolet S10, GMC Sonoma, and Chevrolet/GMC truck and van applications.

Quality Assurance

Standard manufactures this kit with quality components for dependable service. The PR131T is built for fuel system repair work where consistent sealing and regulator function are required.