The G-Body era (1973–1987) and Square Body trucks offer classic styling with modern LS/LT swap potential. This guide highlights five fuel-system components designed to support LS/LT engine swaps in Square Body and 73-91 GMC/Chevy trucks. Each product below is chosen for compatibility with EFI LS swaps, ease of installation, and reliable fuel delivery. The sections include direct product links, images, and key features to help you compare options quickly.
| Product | Brand | Key Feature |
|---|---|---|
| OSIAS Send Unit + Squarebody 73-91 Chevy GMC LS/LT Swap | OSIAS Store | Integrated check valve, no compression fittings |
| OSIAS In-Tank Fuel Pump For GM All Models | OSIAS Store | 58 PSI, drop-in for 1982-1995 GM TBI hangers |
| EVIL ENERGY 58 PSI Fuel Filter Regulator | EVIL ENERGY Store | Built-in 10 micron filter, 200–300 LPH options |
| Spectra Premium GM306A Fuel Tank | Spectra Premium Store | OE replacement quality and performance |
| OSIAS New Squarebody 73-91 GMC LS/LT Swap Hanger | OSIAS Store | 525LPH sending unit, plug-and-play harness |
OSIAS Send Unit + Squarebody LS/LT Swap
This sending unit is designed for 1973–1991 Square Body Chevy and GMC trucks undergoing LS or LT swaps. It features an integrated check valve built into the fuel pump outlet, reducing the need for external compression fittings and helping prevent fuel backflow. The unit is compatible with EFI LS or LT swapped Square Body applications, making installation straightforward for hobbyists and professionals. Its design aims to provide reliable fuel delivery while maintaining factory-like reliability in a classic chassis.
OSIAS In-Tank Fuel Pump For GM All Models
This in-tank EFI fuel pump is designed for LS-series swaps across GM models, including TBI trucks, vans, and SUVs. It operates at 58 PSI and remains compatible with factory wiring and OE pressure regulators, reducing the risk of overloading existing circuits. The kit includes a filter, regulator, tank seal, and strainer, offering a direct drop-in replacement for 1982–1995 GM TBI fuel pump hangers. It supports a range of LS motors (LM7, LR4, LQ4, LQ9, LS1, LS2, LS6, etc.).
EVIL ENERGY 58 PSI Fuel Filter Regulator
The EVIL ENERGY fuel filter regulator combines a 58 psi regulation with an internal bypass and a built-in 10-micron filter to keep fuel clean before entering the engine. With a test flow around 200–300 LPH and a 12V operating system, this regulator is suitable for LS swap EFI configurations. It works with gasoline, E85, and similar fuels, and is designed for 12V DC electric injection systems. This option is compatible with Chevrolet V8 LS-based engines from 1999–2014 and related LS platforms.
Spectra Premium GM306A Fuel Tank
Spectra Premium’s GM306A Fuel Tank emphasizes innovative engineering and quality control to meet or exceed original equipment performance. This option is particularly compelling for restorations or builds that aim to maintain OEM-level reliability while integrating an LS/LT swap. The tank is designed to deliver consistent fuel supply under higher-performance demands typical of modern engine swaps and supports long-term durability in daily driving and spirited use alike.
OSIAS New Squarebody LS/LT Swap Hanger
This new Squarebody hanger is tailored for 1973-1991 GM C/K and Square Body trucks undergoing LS or LT swaps. It includes a Walbro 525LPH pigtail and a plug-and-play adapter harness, helping to streamline installation. The unit is designed to be compatible with both E85 and standard gasoline fuels, ensuring flexibility for different fueling setups. Its high LP(H) rating supports robust fuel delivery for boosted or naturally aspirated LS/LT configurations.
Buying Guide: Key Considerations For G Body LS Swap Fuel Tanks
- Fitment and compatibility: Ensure the part matches your Square Body year range (1973–1991) and is designed for LS/LT swaps. Check whether the unit is compatible with EFI setups and your chosen fuel system routing.
- Fuel pressure and flow: LS swaps typically require 58 psi or similar targets. Consider a pump or regulator that maintains stable pressure under load, with adequate LPH to support peak engine demand.
- Electrical compatibility: Some units include plug-and-play wiring or require harness adapters. Confirm that your vehicle’s electrical system can support the pump’s draw without overloading the factory wiring.
- Fuel compatibility: If you plan to run E85 or ethanol blends, verify that components (pump, regulator, hoses, seals) are compatible with ethanol to prevent swelling or degradation.
- Installer effort: In-tank pumps, sending units, and mounted hangers vary in ease of installation. Look for kits with necessary seals, gaskets, regulators, and harnesses to minimize custom work.
- Durability and materials: Swapped LS setups encounter higher fuel pressures and potential heat exposure. Choose rust-resistant, corrosion-resistant components with reliable seals and proper venting.
- Maintenance and service: Some parts include integrated filters; consider long-term maintenance needs and availability of replacement parts or filters.
- Warranty and support: Favor brands that offer clear warranties and technical support, especially for custom swaps where troubleshooting can be challenging.
When planning an LS/LT swap for a G Body or Square Body truck, selecting a cohesive fuel-tank system helps ensure reliable fuel delivery and engine performance. The products listed here emphasize compatibility with LS-based engines, straightforward installation, and robust performance under typical street and performance driving scenarios. Compare these options based on your specific swap goals, fuel choice, and available space in the fuel-tuel routing plan.