The MKIV complete kit comes with everything you need to build the car. Of course, you can option things in/out as you make changes, upgrade, etc. One of the items that I’ll be upgrading is the fuel tank. Not that the Mustang tank is bad, it’s just a smallish 12-14 gallons. Boyd’s Tanks makes a custom gas tank that has been shown to hold > 24 gallons, nearly 2X the capacity!
Why? Well, every once in a while my wife and I like to drive to the Monterey coast, and that’s a 200 mile trip one-way. I figure the Coyote will pull down 20+ mpg on the highway, so it sure would be nice to have 400+ miles per tank (of course cruising!) The Boyd’s Tank is custom built for the MKIV, and mounts directly to the frame, and it’s a work of art!
Boyd’s Welding has examples on their website https://fueltankparts.com/collections/factory-five-roadster but only shows the MKII tank, you’ll have to reach out to Boyd’s to get the details on the MKIV tank. These are the part #’s they sent to me:
14031 Factory Five MK4 Stealth 340 $790.00 <– this is the one
14032 Factory Five MK4 A-1000 $1,040.00
14033 Factory Five MK4 NON EFI $490.00
So – why the Stealth 340? The A-1000 is just too big for a naturally aspirated Coyote, and the OEM pump provided with the MKIV is 255lph, but you have to remember you need 65psi with the Gen3 Coyote. Having extra volume will be good, especially when you raise the psi requirements the volume is reduced. I’ll also need a new fuel pressure regulator that can achieve the 65psi needed, so the Aeromotive 13130 will be a nice adaptation that can meet the psi needs of the Gen3 5.0
Also, a fuel sending unit is needed, and by recommendation of some friends – the Classic Instruments SN35T11 (the last 2 numbers is the length of the tube) 11″ should be well sized for this tank and should give accurate readings and adaptable to the Speedhut fuel gauge.
The fuel filter that comes with the MKIV kit should be sufficient – so barring any issues, I’ll most likely leave that intact.
