Upgrade your Squarebody Chevy or GMC truck fuel system for EFI and LS power with the Spectra FG05M (Driver Side) and FG05N (Passenger Side) EFI sending units. These OE-style replacement units allow you to drop a high-pressure fuel pump directly into your factory-style tank – the cleanest way to fuel your LS swap or EFI conversion project.

We recommend pairing these sending units with a 1987+ fuel tank for best fit and compatibility with modern EFI systems.

Why Choose FG05M & FG05N for Your EFI Build?

• ✅ Direct-fit for Squarebody tanks – Designed to replace factory sending units
• ✅ EFI-ready design – Supports in-tank fuel pumps for clean and quiet operation
• ✅ Perfect for LS swaps – Get the pressure and volume your new engine needs
• ✅ Choose the correct side – FG05M = Driver side / FG05N = Passenger side
• ✅ Works with multiple pumps – See options below based on horsepower

Recommended In-Tank Fuel Pumps:

• 🔧 Spectra 190LPH Pump – For stock LS swaps up to 450HP – Click Here
• 🔧 Walbro 255LPH Pump – Supports builds up to 600HP – Click Here
• 🔧 Aeromotive 340LPH Pump – For high-performance setups up to 850HP – Click Here

Don’t Forget Your Adapter Fittings:

These sending units feature factory-style hard line outlets (3/8" & 5/16") and require adapter fittings to convert to AN-style fuel systems:

• 🧰 Hard Line to AN Adapter Fittings – Click Here

Fitment & Compatibility:

• ✔️ Designed for Squarebody Chevy/GMC pickups (1973–1987)
• ✔️ Compatible with EFI fuel pumps
• ✔️ Recommended upgrade to 1987+ fuel tank for best performance
• ✔️ Choose FG05M (driver side) or FG05N (passenger side) based on your tank configuration

Tech Tip:

Mounting an in-tank EFI pump helps eliminate external noise, prevents vapor lock, and makes your build look cleaner. Combine this with our AN PTFE hose kits or LS Swap kits for a complete EFI-ready fuel system.