Relocating and Plumbing the F100’s Fuel System
Regular readers are aware of Project F-Word’s rapid progress as things have rapidly escalated on our 1969 F100 project truck since it was disassembled and rebuilt from the ground up. Now that the chassis and suspension are mostly resolved, we have one Ford performance Gen 3, 5.0-liter Coyote Aluminator (more on that to install) and a Tremec T56 Magnum 6-speed from Silver Sport in. This time, we’re going to redesign and build the fuel system to feed that coyote.
In case you didn’t know, trucks from the 1960s had their fuel tank in the cab, behind the seat; Chevy and Ford both. Of course, this isn’t the safest location to put it – you’re essentially driving a bomb with all the fuel always right behind you. Therefore, it is common for owners of these trucks to move the tanks to the rear part of the truck under the bed, where the factories eventually moved them.
In the case of our project truck, which was supposed to make a lot of steam with the hot Coyote engine under the hood, we wanted to do just that – take the tank away from the driver and put it under the bed. Turns out a 1969-1970 Mustang gas tank fits almost perfectly between the frame rails with just a little effort. So that’s what we did, mostly using Holley‘s parts on the way.
We started with the 400 l / h Sniper EFI fuel tank system capable of supporting up to 750 horsepower. We have added the renowned HydraMat Fuel Mat for good measure to avoid starvation, although the included tank has a 4.3 liter internal baffle. The fuel system comes complete with the galvanized and powder coated tank, 400 lph in-tank fuel pump, hanger and transmission unit so all you have to do is guide it to your fuel rails and secure it.
We wanted to accomplish that task, starting with removing the cargo box and rear bumper / brackets to allow us to move the center frame crossmember back enough to fit the Mustang tank. We then supported the rear frame with jack stands to make it sturdy.
We then ordered all parts and fuel system hose, fittings and the like online from Holley’s wish list function, and put it all together. This is a great feature on Holley’s site – we use it all the time. Now that we have a complete, relocated (and safer!) Fuel system to feed that hungry Coyote, this pup is almost ready to hit the road and tear up a few autocrosses!
The parts list
- Sniper EFI fuel tank system (400 l / h) for 1969-1970 Ford Mustang (Part No. 19-417)
- Hydramat (3 × 8) 11mm center exhaust with 6 locking pins (Part No. 16-124)
- Earls 100 gph billet aluminum fuel filter – 10 micron, – 6 AN female inlet and outlet (Part No. 230606ERL)
- Earls -6 AN bulkhead nut (Part # AT592406ERL)
- Earls -6 AN Male to 3/4 ″ -16 (Part # AT985068ERL)
- Earls -6 AN Male to 9/16 ″ -18 (Part # AT985006ERL)
- Earls 2 Piece Aluminum Adjustable AN Wrench Set (Part No. 230351ERL)
- Earls 90 degree -6 AN bulkhead (Part # AT983306ERL)
- Earls Flame Guard Insulation, 10 Feet (Part No. 571008ERL)
- Earls fuel filter mounting brackets (Part No. 230622ERL)
- Earls hose and hose separator (Part No. 167509ERL)
- Earls HP billet EFI by-pass fuel pressure regulator (P / N 12846ERL)
- Earls OE Fuel Line EFI Quick Coupler -6 to 3/8 (Part # AT992066ERL)
- Earls pipe sealant (Part # D024ERL)
- Earls pressure gauge (Part No. 100187ERL)
- Earls straight male AN -6 to 1/4 ″ (Part # AT981606ERL)
- Earls UltraPro hose end -6 AN (part # 620106ERL)
- Earls UltraPro hose end -6 AN 120 degree angled hose end (Part No. 621206ERL)
- Earls UltraPro hose end -6 AN 45-degree forged hose end (Part No. 624506ERL)
- Earls UltraPro hose end -6 AN 90 degree forged hose end (Part No. 629006ERL)
- Earls UltraPro hose end -6 AN 90 degree angled hose end (Part No. 629106ERL)
- Earls UltraPro Check Valve – 6AN Male – Stainless Steel Hinged Door with Viton Seal (Part No. 253006ERL)
- Earls UltraPro Series Tubing, 10m Long Double Helix PTFE Ribbed Tubing (Part No. 693306ERL)
- Replacement Bolt-On Fill Neck and Aluminum Cap Kit (Part No. 19-166)
Cutting, grinding, welding
In with the new
Until next time
In the next installment, we’ll take a closer look at the Gen 3 Aluminator installation. And we also have some steering upgrades to our modern suspension… not to mention everything else to get this rusty old farm truck into combat form. Stay with us!