The fuel lines must be well supported and stabilized to prevent vibration
cracking. Here is a picture of how mine are supported using adel
clamps:
Note: In the picture above it looks like the fuel lines are touching on
the right. That's just the camera angle, they actually have a 1/4"
space in between them.
The fuel lines come down the front and rear of each door frame and meet at
a bulkhead "T" fitting on the front door flange as shown here:
Again the fuel lines must be supported and immobilized. Here is the
fuel line adel clamped under the pilot's side door flange:
I copied an idea from Russ
Erb's excellent CD and ran the aft fuel line up the rear door flange:

This will later be wrapped with fabric when the fuselage is covered. No
one will ever know its there (except everyone reading this).
Here is the aft fuel line on the passenger's side of the cockpit. I
have replaced the plastic tie wrapped with some waxed, flat nylon lacing
cord to eliminate the "bulge" that the tie wrap would make:
The front fuel line runs from the "T" fitting on the forward door flange,
up the windshield post. The stabilize it, I again used some adel clamps
as shown here:
I have elected to have the fuel flow option for my EIS engine monitor. This will give me the Gallons per Hour (GPH) I'm burning for any given power setting. It will also total the gallons I've used and tell me what I have remaining in the tanks.
IMPORTANT: If you have purchased the Grand Rapids Technology EIS don't use the fuel flow sensor that comes with the unit for a gravity fed system. It is designed for a fuel pump system. If you have gravity feed only, it is recommended that you use the Electronics International FT-90 sensor. This integrates with the GRT system and is designed for a gravity feed system.
I installed my FT-90 fuel flow sensor about 1/2 way between the gascolator
and the firewall bulkhead fitting:

Note that I used a piece of aluminum angle and a couple of adel clamps
on tubes to mount the sensor rigidly.