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Lethal Performance

Lethal Performance 99-04 4V Budget Return Style Fuel System (Cobra / Mach-1)


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Mustang performance parts, performance and tuning
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Customer Reviews


Lethal Performance 99-04 2V Budget Return Style Fuel System. The best selling, best performing fuel system kit on the market!Budget return fuel systems are intended to be used with STOCK fuel rails. Does not work with aftermarket fuel rails.

Lethal Performance and DivisionX have done it again! This time we're going to change the way the fuel delivery market works by offering our customers the ability to go return style but without the entire cost of a full return style fuel system. Even better, with this new budget return style system you'll still utilize the stock feed line, stock fuel rails and the stock fuel tank. This system comes complete with everything you need. Just install it and get your car tuned for the return style setup and you're good to go.

NOTE: This system comes standard with Fragola PTFE fuel hose. PTFE fuel hose is more durable than the standard hose and prevents fuel smell typically found when using non PTFE hose.We have used the standard Fragola non-Teflon based fuel hose on several of our shop cars with both gasoline and E85 with excellent results and no fuel smell. However we do recommend the PTFE hose which comes standard to ensure there's no fuel weep or smell.

How's it work?It starts with a DivisionX billet fuel hat that houses (2) return style fuel 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 industry changing adapter that installs a DivisionX two port fuel pressure regulator onto your stock fuel rail. Included is a 100psi liquid filled mechanical fuel pressure gauge, vacuum hose and t-fitting which allows proper installation of the regulator. From the regulator we provide a PTFE lined -6an return line which returns the fuel back to the tank through the DivisionX fuel hat. The last piece of the kit is our famous Lethal Performance Plug and Play dual return style harness which features (2) 40amp relays, (2) 20amp fuses, Fusible links for the power distribution box connection and our OEM 6 pin connector which plugs directly onto the 6 pin connector on the fuel hat making installation a breeze!

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 mechanical 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 all of the Lethal Performance project cars over the years with great success.

The Budget Return Kit Includes:
DivisionX Dual Pump Return Style Fuel Hat
DivisionX Two Port Fuel Pressure Regulator
Walbro GSS342 Fuel Pumps (Upgradable)
DivisionX Hat to Stock Line Adapter
DivisionX Regulator to Rail Adapter
DivisionX FRPS Adapter
Vacuum line and T fitting
0-100 PSI Liquid Filled Mechanical Fuel Pressure Gauge
Lethal Performance Plug and Play Dual Pump Return Style Wiring Harness

All fittings and hardware needed for installation

NOTE: All models EXCEPT 03-04 Cobra REQUIRE fuel level sender bracket p/n DX-37011 if stock level sender is being used. If using OEM 03-04 Cobra sender, bracket is not required.

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

Vehicle Application(s)

This product fits the following models and years

SVT Cobra1999 2000 2001 2003 2004
Mach-12003 2004

Customer Reviews 4 item(s)

Purchased back in December and install was VERY simple. Directions so easy, even a caveman could do it.......... Review by kurt / (Posted on 5/12/2012)
Great kit for an amazing price!
Everything in this kit is top notch. Dont do that mickey mouse stuff by doing a boost a pump etc etc. Pictures dont do justice, everything is very well made and you wont regret running this setup on your car. Review by Arbi / (Posted on 5/4/2012)
Perfect Fuel system for big power and great value
I purchased this system to give myself more room to grow when I step up the boost on my Whipple 2.9. First off, this kit is extremely well designed from hat to fittings. I was always nervous when it came to working on fuel systems but the directions and knowing Lethal was always available to help really eased my reservations. I have everything buttoned up except for the minor wiring. The new wiring harness makes everything so easy a caveman can do it. Review by Ricky / (Posted on 5/2/2012)
well layed out system and excellent value
just bought this system and am installing now and i must say a complete fuel system doesnt get any more plug and play than this! the fuel hat is top notch quality and the wire harness is put together very well and leaves little left to do besides routing and very minor wiring. Review by john / (Posted on 5/1/2012)

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