Product images and videos are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Air and Fuel› Fuel Pumps, Regulators and Components

Lethal

L1E Dual Pump Fuel System

Name: L1E Dual Pump Fuel System
Brand: Lethal
SKU: FI-42-821E

$1,754.73

SKU: FI-42-821E

Free Shipping over $200

$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Fore Innovations L1E Dual Pump Fuel System is a direct-fit upgrade for 2018-2021 Mustang GT models. This system is designed to supply high-pressure fuel pump (HPFP) and port injection, supporting up to 800-900 rear-wheel horsepower.

It features an in-tank supply system that retains the OE transfer, fuel level sender, and EVAP functionality. The system includes upgraded feed and return lines, a high-capacity filter, and a check valve. A flow-through t-block is direct-mounted on the HPFP inlet tube, and a high-capacity F1i regulator provides options for static and MAP reference. The included billet fuel rails are designed for proper port injection supply with E85, and the system is E85 capable when specific fuel pumps and filtration are selected.

Show original supplier description

The Fore Innovations L1E Dual Pump Fuel System is engineered as a direct-fit upgrade for 2018-2021 Mustang GT models, enhancing fuel delivery capabilities to support significant power increases. This system is capable of supplying both the High Pressure Fuel Pump (HPFP) and port injection, making it suitable for applications up to 800-900 rear-wheel horsepower. It is recommended to run one pump continuously and activate the secondary pump under load. Key components of the L1E system include an in-tank supply that preserves the factory transfer function, fuel level sender, and EVAP system. It is outfitted with upgraded feed and return lines, a high-capacity filter, and a check valve. A unique flow-through t-block mounts directly to the HPFP inlet tube, coupled with a high-capacity F1i regulator that offers both static and MAP reference configurations. The included billet fuel rails ensure proper port injection supply, and the system can be configured for E85 compatibility with specific pump and filter choices. Included in the kit are S550 Mustang Dual Pump Module, billet fuel rails, F1i Fuel Pressure Regulator, an 88mm Inline Fuel Filter, FCV Checkvalve, and a t-block for direct HPFP mounting. It also comes with approximately 30 feet of fuel line, billet compression style hose ends, billet low profile 90-degree AN to ORB swivel fittings, straight AN to ORB fittings, rail extensions, and an EFI to ORB adapter, along with hose straps.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

Brand	Lethal
Part Number	FI-42-821E
Category	Air and Fuel

Videos

2018-2019 MUSTANG GT COMPLETE FORE INNOVATION RETURN FUEL SYSTEM INSTALL WITH 2 REGULATORS DI & PORT

5,000+ Trusted brands

1M+ Enthusiasts

5M+ Parts sold

(760) 282-4645 hello@motormia.co

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy