Early 67, want to convert to 3/8 2 pc fuel line from tunnel mounted 5/16 line

[Wallgeye]

Currently working through a brake and suspension rebuild. Original brake hoses and funky Cougar only strut rods still on the car!

While removing brake lines i noticed that the fuel line is looking pretty crusty. Original 5/16 through the tunnel. I am wanting to update the fuel line to 3/8 2 piece while I’m in here. I have all of the parts, sender, line, protective plate, clips, etc,. What I do not have is a drivers side torque box with the hole in it for the fuel line to pass through.

I tend to overthink things and have been poking around online seeing this project mentioned but not discussed with much detail. The one video I found shows drilling it out with a 3/4 inch holesaw but no mention of how they chose where to drill.

Is it as simple as running the new line up to the torque box semi installed and marking the box for a location?

[Since1980]

Yes, it is just a hole. Here’s a view of approximatation.

I have never seen a ‘67 or’ '68 run the fuel line any other way except through the torque box, along the unibody frame, take a left untill the pinch weld. following

the rocker untill the front leaf spring mount.. ect.

Is it possible the box was replaced?

It’s possible it is very rusty and was covered with a wall of unknown material.

Preformed lines are available and work great.

[Royce]

Unlike a 68 Mercury Cougar a 1967 has no LH torque box so no hole is required.

[mopauly1965]

Learned something new today. Thanks Royce

[Since1980]

Did early Cougars not have a torque box on either side like the '65-66 Mustang where the fuel line does turn to the tunnel?

[CougarCJ]

1967 Cougars do not have a passenger side torque box.

[Wallgeye]

I thought it was the right hand torque box that was not installed on the 67’s. My car does not have one on the passenger side. It sure looks like there is one on the driver’s side, minus the hole being discussed. I’ll see if I can figure out adding photos to the post.

[Wallgeye]

Thank you, that will help! My cars birthday is 12/66. The fuel line is tucked up in the transmission tunnel and kicks out just forward of the torque box to follow the frame rail through the suspension like the front section of the 2 pc line.

[Royce]

Correct, I mistakenly said otherwise.

[Wallgeye]

This is how my fuel line transitions out to the wheel well from the transmission tunnel.

Yes, I’m scared to see what is under the undercoating.

[Since1980]

So, to be clear most 1967 Cougars ran the fuel line through the driver’s side torque box. Your route is that of a 65-66 Mustang. Here is a view of a 65 fuel line route.

Your torque box might be correct without the hole. Early production Cougars and Mustangs didn’t run it through the torque box, I’ve just discovered. Hopefully you have one of them. Some safety laws may have gone into effect moving the line away from the drive shaft. Too bad because that decision rotted out a bunch of cars.