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Lethal Performance

Lethal Performance 99-04 Mustang Coyote Swap Return Style Fuel System

Mustang performance parts, performance and tuning
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Now available from Lethal Performance is a cost effective, complete return style fuel system for the SN95 platform installing the 5.0L Coyote based engine. This fuel system is based off the "Budget Return Style Fuel System" that is offered for the current 99-04 engines, but modified to accommodate the stock Coyote fuel rails that do not utilize a FRPS (fuel rail pressure sensor).

How does it work?

It starts with a DivisionX billet fuel hat that houses (2) return style Walbro GSS342 pumps. The fuel hat installs in your stock fuel tank. Then we use the DivisionX hat to stock line adapter to connect the hat to your stock feed line. The next piece is a threaded adapter features the OEM spring lock receiving end and a -8an male thread that installs a DivisionX two port fuel pressure regulator directly onto the stock fuel line in the engine compartment. From other end of the regulator, we supply a length of -8an fuel hose to feed the stock Coyote fuel rail that attaches using a special adapter fitting with -8an male threads. The return line exits from the bottom of the regulator and runs under the car and returns back to the DivisionX billet top hat. The last piece of the kit is our famous Lethal Performance dual return style harness which features (2) 20amp relays, (2) 10ga power and ground wires and dual 10ga power wires from the battery. In addition our harness and hat use OEM 6 pin connectors to make it a plug and play setup which requires no soldering.

If you're unfamiliar with a return style kit here's how it works.

The fuel pumps are wired to run full time. Fuel pressure is set by the mechnical fuel pressure regulator. The excess fuel bleeds off the regulator through the return line and back to the tank. In this system we use a boost reference regulator. That means that for every 1psi of boost the regulator see's it's going to mechanically raise fuel pressure by 1psi. So if you start with a base pressure of 40psi and make 20psi of boost you'll end up seeing 60psi of fuel pressure when in full boost. What's great about a return style fuel system is that it's easy to tune, doesn't use any returnless style electronics and works great for both street and track applications. We run return style systems on our 2011 5.0L GT, 2010 GT500 and 03 Cobra. There's no reason to look back once we went return as we now know how well the return style system works.

Kit Includes:

-DivisionX Dual Pump Return Style Fuel Hat
-DivisionX Two Port Fuel Pressure Regulator
-DivisionX level send bracket (Is not utilized with 03-04 Cobra level sender)
-(2) Walbro 465lph fuel pumps (E85 Compatible)
-DivisionX Hat to Stock Line Adapter
-Fragola Push Lok Hose
-Lethal Performance Stock line to Regulator Adapter
-Lethal Performance 3/8" rail to -8an line adapter
-Vacuum line and T fitting
-0-100 PSI Liquid Filled Mechanical Fuel Pressure Gauge
-Lethal Performance Dual Pump Return Style Wiring Harness
-All fittings and hardware needed for installation
-E85 Coating STANDARD!

For more info, check out our full write-up HERE!

Vehicle Application(s)

This product fits the following models and years

SVT Cobra1999 2001 2003 2004
Mach-12003 2004
Mustang GT1999 2000 2001 2002 2003 2004

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