Stanadyne 11.5mm High-Pressure Fuel Pump for GM LTx

Stanadyne 11.5mm High-Pressure Direct-Injection Pump for GM Gen V LTx

This Stanadyne 11.5 mm high-pressure fuel pump is the step between a standard OE replacement and the full 12 mm RGX race pump. It is built for GM Gen V direct-injection applications that need dependable additional high-side fuel capacity while retaining factory-style installation, packaging and electronic pressure control.

Manufactured and tested by an original-equipment fuel-system supplier, this pump is a strong fit for modified street combinations, ethanol-capable builds and performance packages that have outgrown a stock pump but do not require the maximum output and installation complexity of the RGX.

Key Features

• 11.5 mm high-pressure pump architecture
• Designed for GM Gen V LTx direct-injection systems
• Precision manufactured and assembled by Stanadyne
• Factory-style mechanical drive and electronic demand control
• Compatible with gasoline, E10 and properly configured E85 fuel systems
• Direct-fit replacement and performance-upgrade format
• Suitable for naturally aspirated and forced-induction street combinations
• Each assembly is tested for performance and functionality

Complete Fuel-System Planning

High-side pump output cannot be evaluated by itself. Available fuel delivery depends on low-side pressure and volume, injector capacity, camshaft fuel-pump lobe, commanded rail pressure, fuel type, target lambda and calibration.

For combinations requiring substantially more direct-injection capacity, pair the correct high-pressure pump with Stanadyne's 7.45 mm high-flow LT4 injectors. For maximum race-focused output, consider the Stanadyne RGX 12 mm pump.

Installation and Calibration

Professional installation and calibration are recommended. Verify the pump's exact application, installed-height requirements, fuel-pump lobe compatibility and complete system capacity before installation. Do not assume a larger high-pressure pump will correct an inadequate low-side system.

SMG Speed Shop and North Texas High Performance can help select the proper pump, injectors, low-side fuel system and tuning strategy for your GM LTx combination.