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.
Processing & Shipping Overview
Processing occurs before shipping.
Most in-stock items typically process within 2–3 business days before shipment or pickup. Expedited shipping options affect transit time after an order ships and do not speed up processing.
Made-to-order, special-order, vendor drop-ship, and freight items require additional processing time before shipping. Any extended lead times will be noted on the product page when applicable.
For the most up-to-date order status or lead time questions, please contact sales@smgspeed.com or use live chat during business hours.