Fuel system updates
This update covers fuel system updates.
Related notes live on the Factory Five Cobra build hub.
fuel system updates: Why upgrade the fuel tank
The MKIV complete kit comes with everything you need to build the car. Of course, you can option things in or out as you make changes and upgrades.
First, one of the items that I will upgrade is the fuel tank. The Mustang tank is not bad. However, it is a smallish 12-14 gallons.
Meanwhile, Boyd’s Tanks makes a custom gas tank. As a result, capacity has been shown to hold > 24 gallons. In other words, that is nearly 2X the capacity!
Why? Well, every once in a while my wife and I like to drive to the Monterey coast. That is a 200 mile trip one-way.
I figure the Coyote will pull down 20+ mpg on the highway. Therefore it sure would be nice to have 400+ miles per tank while cruising!
Also, the Boyd’s Tank is custom built for the MKIV. Then it mounts directly to the frame. Ultimately it is a work of art!
Boyd’s Welding has examples on their website https://fueltankparts.com/collections/factory-five-roadster. However, the page only shows the MKII tank. So you will 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
Why the Stealth 340 pump
So why the Stealth 340? First, the A-1000 is just too big for a naturally aspirated Coyote.
Also, the OEM pump provided with the MKIV is 255lph. However, you have to remember you need 65psi with the Gen3 Coyote.
Therefore having extra volume will be good. That is because raising the psi requirements reduces the volume.
Next I will also need a new fuel pressure regulator that can achieve the 65psi needed. Likewise, the Aeromotive 13130 will be a nice adaptation that can meet the psi needs of the Gen3 5.0.
Boyd tank capacity
Also, a fuel sending unit is needed. By recommendation of some friends, the Classic Instruments SN35T11 should be well sized for this tank. The last 2 numbers are the length of the tube. Ultimately the 11″ unit should give accurate readings and adapt to the Speedhut fuel gauge.
Meanwhile, the fuel filter that comes with the MKIV kit should be sufficient. Therefore, barring any issues, I will most likely leave that intact.
