Fuel Line Routing Question

I want to add a gl*** bowl fuel filter to my firewall and I'm thinking the input will come through the firewall from the interior. No to accomplish this I've figured the best way to route the fuel line between the bottom of the floor subframe and the frame. I would then attach it to hose coming from the gas tank in the trunk (just behind the proportioning valve).
Aside from the obvious of if it need to be changed I'll have to lift the body off are there any other concerns with routing the line this way?
Attached are some pics to show how it would look like.
Thanks for your suggestions.

Forgot to add that another reason I want to route it this way is because of the proximity to the header and muffler.

 

Man Chemin, something about a fuel line in the interior just doesn't sound right. You sure there's no other way around the back of the engine maybe ?

 

As long as it doesn't leak I wouldn't see a problem. My tank is in back of my Sedan so there's a small section inside the car.

 

I hope you can find another way. I'm ***uming your gauges are right above your proposed gas line. For safety sake I wouldn't have it there. Electricity and gas not simpatico.

 

I think I saw the pic wrong. Looks like you have a lot of clearance before your wiring? Either way fuel inside is something I wouldn't do.

 

How are people with them mounted on the firewall routing the input line?
I know on the original A's they came from the tank which is inside.

 

If I am not mistaken, and I often am, there is a reason it's called a "firewall". Fuel lines are always routed outside of the cab for that obvious reason. I won't claim I know any laws but I imagine you would have a hard time p***ing a tech inspection, let alone a good DOT inspector.

 

Just found some old NHRA rules, they may still be applicable...

1:5 FUEL SYSTEMS

Location: All fuel tanks, lines, pumps, valves, etc. must be outside
of the driver’s compartment and within the confines of the frame
and/or steel body. Cool cans, fuel-distribution blocks, etc. must be
located at least 6 inches forward of the flywheel/bellhousing area on
rear-wheel-drive (RWD) vehicles, and on opposite side of
flywheel/housing area on front-wheel-drive (FWD) vehicles. Fuel
pressure gauge isolators, with steel braided line, may be mounted
on firewall.

Tanks: When permitted by cl*** regulations, fuel tanks located
outside body and/or frame must be enclosed in a steel tube frame
constructed of minimum 1 1/4-inch O.D. x .058 chromoly or .118
mild steel tubing. All fuel tanks must be isolated from the driver’s
compartment by a firewall, completely sealed to prevent any fuel
from entering the driver’s compartment. All fuel tanks must have a
pressure cap and be vented outside of body. A positive-locking
screw-on fuel tank cap is mandatory on all open-bodied cars.
Insulated fuel tanks prohibited. When used, fuel cells must have a
metal box protecting the part of the fuel cell that is outside of body
lines or trunk floor, excluding hose connection area in rear. Nonmetallic
fuel cells or tanks must be grounded to frame.

Lines: All non-OEM fuel lines (including gauge and/or data
recorder lines) must be metallic, steel braided, or NHRA-accepted
“woven or woven-pushlock.” A maximum of 12 inches total (front to
rear) of non-metallic or non-steel braided hose is permitted for
connection purposes only; individual injector nozzle and motorcycle
fuel lines are excluded. Fuel lines (except steel braided lines) in the
flywheel/bellhousing area must be enclosed in a 16-inch length of
steel tubing, 1/8-inch-minimum wall thickness, securely mounted as
a protection against fuel-line rupture. Fuel lines may not be routed
in the driveshaft tunnel. It is mandatory that fuel lines p***ing
supercharger drive belts be steel braided, NHRA-accepted woven
or woven-pushlock, or be enclosed in protective steel tubing. A
current list of NHRA-accepted woven or woven-pushlock fuel lines
is available on NHRA.com. All NHRA-accepted fuel lines must use
ends that are specifically designed for the type of fuel line being
used. No hose clamps allowed on NHRA-accepted fuel lines.
Pumps/Valves: Cars with non-OEM-type mechanical fuel pumps
must have a quick-action fuel-shutoff valve within easy reach of
driver and located in the main fuel line between the fuel tank and
the carburetor and/or injectors. Fuel recirculation systems not part
of normal fuel/pump system prohibited. All cars in Stock, Super
Stock, Compe***ion, and Pro Stock must be equipped with a
positive-lock drain valve located between the fuel tank and the
carburetor(s) or fuel injector to facilitate removal of fuel samples for
fuel-check purposes.<!-- google_ad_section_end -->

 

Thanks for the responses. I was originally going to use the 3/8" coated line and wanted to keep it hidden. Instead I have some 5/16" stainless line sitting around that I think I'll run and move the gl*** bowl away (if I do end up using it) from the firewall.