On 3 Performance (1987-2004) Mustang Return Style Fuel System – E85 Compatible

(1 customer review)


Instead of having to make countless orders for fittings, lines, etc., we have a complete package deal to make the fuel system simple.  Starting with our On 3 triple fuel pump module paired with a set of 320lph fuel pumps to support 1000hp.  When this system is installed, it looks like a factory tank from the rear and even with 2 pumps, you don’t even hear them running.  Sounds like you have a single pump upgrade which is great for the customer looking for an extremely clean install and a “sleeper appearance.”

To elaborate a little more on our fuel hat, our new design starts with 4 solid billet 6061 chunks of aluminum and machined down to what you see.  This is where our setup is different from anything on the market currently.  We designed the top portion as 2 pieces and machined the top so all fuel pumps would come to one single port.  Its a more clean design, eliminates the need for welding and avoids any need for extra lines / Y-blocks.  So you just have one simple line coming out of the hat to work forward no matter how many pumps you are running.  Also our new design is a little more slim so it will not interfere with the fitment of the tank or require any spacers to drop it down from hitting the spare tire area.

If you have ever built a fuel system, often times most people will use pipe threaded fittings which is a MAJOR headache.  In our system, we designed the entire kit around the On 3 Performance O-ring fittings.  So no need for pipe tape, chasing leaks, and worrying about over-tightening and pulling threads.  O-ring fittings are simple and easy to install, uses very little torque and allows for perfect seal.  All of our fittings included in the kit will be anodized black which is great for use with E-85 and to prevent corrosion.

Moving forward from your On 3 fuel hat (10an supply line), all black anodized fittings, On 3 in-line fuel filter, Y-Block to feed fuel rails, and 1:1 boost referenced fuel pressure regulator.  We also include the complete return line kit(8an) and can be deleted if you are planning a return-less system.  See pricing below for a complete list of items which can be deleted from the this kit for a discounted price.  We also have other optional items that can be included to finish off your system if needed depending on the application





– On 3 Performance CNC Billet Fuel Hat Assembly

– On 3 Performance Custom Baffled Fuel Tank

– On 3 Performance 340lph Fuel Pumps (2)

– On 3 In-line Fuel Filter

– On 3 Complete Fitting Kit, Anodized black (23 Piece)

– 10an Black Braided Feed Line

– 8an Black Braided Feed / Return Line

– On 3 Performance Billet 1:1 Fuel Pressure Regulator (8an orb ports for simple fitting install)



In addition to our kit listed here, you will need a set of fuel rails to finish the system off.  There is not a universal set of rails we can use for all applications so we leave the rail option up to the customer.  We designed our kit around 8an o-ring inlet and outlets and plumb the kit to the front of the rails and out the back to the regulator.  You will want to ensure you confirm this as we have the fittings in your kit setup for this design.  If not, you will end up having to purchase additional fittings to complete the install.


We know people have some items purchased so we have a list below if you would like to delete any specific item




1987 – 1995 Mustang Customers:

The tank will bolt in with the stock straps but will require you to modify a filler neck from the 96-04 cars.  Its pretty simple to do and we have photos we can supply if you buy a fuel system from us.  This is a stealth system and will look like a stock tank but support 1000+ RWHP.  On our shop 1990 Foxbody coupe, the filler was basically cut into 3 pieces, shortened the distances and welded back up.


Shipping is included to the lower 48 USA states. Please email for shipping quotes before clicking buy it now if you are outside the lower 48. on3.greg@gmail.com or On3performance.bob@gmail.com


Ohio Residence:

All Ohio sales are subject to 7.50% Ohio Sales Tax


Products are brand new and included everything from the photo unless otherwise specified.  Buyer takes all responsibility for this product and the install of the product on the car regardless of any condition.  We will not be held liable for any damages or injury do to the install or use of this product.  If purchasing from out of the USA, we will only ship to verified Paypal members.  All sales are final unless otherwise specified in the auctions.  We always package the items sufficiently and use adequate packing material to prevent damage.  As for warranty info, you would need to resort back to our website which has all info posted.  Should you have any questions regarding any of these policies, inquire with us before purchasing.  Unless insurance is paid for, the buyer will be responsible if the product is damaged during transit. We ship Fedex and USPS Internationally so if there was damage, you would want to file with the delivery driver if there was visible damage.  We are always willing to work with customers in order to keep satisfaction to a certain point.  As you will see we offer many products and are not going anywhere.  Buy with confidence and enjoy
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1 review for On 3 Performance (1987-2004) Mustang Return Style Fuel System – E85 Compatible

  1. Trauge May

    Interested in fuel system, my question is if I add a e-85 fuel pump with the other gasoline pumps will I be able to run both fuels or just one or the other??
    I’ve like to setup my 97 mustang gt as a flex fuel type of vehicle on top of all the modifications.

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