Spectra 73-87 Blazer Sending units for EFI & LS swap FG12L, FG12K, FG12M

Spectra Premium EFI Sending Units for Blazer Tanks

Upgrade your fuel system the right way. The Spectra Premium EFI Sending Units for Blazer tanks make it easy to convert your classic Chevy Blazer to electronic fuel injection. Whether you're tackling an LS swap, an EFI retrofit, or simply refreshing your fuel system, these sending units offer reliable performance and precise fuel level readings.

EFI Conversion Made Easy

Designed specifically to work with factory-style Blazer fuel tanks, these sending units allow you to integrate a high-pressure EFI fuel pump (sold separately) without fabricating or modifying your tank. Built to OE specs and rigorously tested, each unit comes with everything you need for proper installation — fuel level sender, float, strainer, lock ring, and O-ring.

Needed adapter fittings to convert to AN

These spectra sending units require M14X1.5 female and M16X1.5 Female to AN adapter fittings. They can be found HERE.

Note: These units do not include the fuel pump we recommend the Spectra SP1115 for stock engines to 450HP, the Walbro 255 GCA 758 for up to 600HP, and the Aeromotive 340Lph for up to 750HP.

Be sure to match the sending unit to your tank size.

Available Part Numbers by Tank Size

• FG12K – For 25-Gallon Tanks
• FG12L – For 31-Gallon Tanks
• FG12M – For 40-Gallon Tanks

Key Features

• Complete Kit – Includes fuel level sender, float, strainer, lock ring, O-ring, and 2-wire setup
• Reliable Performance – 0 - 95 Ohm resistance (GM gauge compatible)
• Secure Fitment – Leak-free with lock ring and O-ring
• EFI-Ready – Accepts high-pressure EFI pumps for LS or EFI swap builds
• OE-Style Connections – Simplified installation without adapters

Technical Specifications

Ideal For:

• LS Engine Swaps in Full-Size Blazers
• EFI Conversions in Classic Chevy Trucks
• Upgrading from Carbureted Systems
• Custom Fuel System Builds Using OEM Tanks

Compatible Vehicles

Chevrolet Blazer (Full-Size) and GMC Jimmy with 25, 31, or 40-gallon tanks.

Why Buy from HotRodAN.com?

• Performance fuel plumbing specialists for GM and custom builds
• Fast shipping across the USA and Canada
• Lifetime warranty on all AN fittings & accessories