Model Forum / Radio Controlled / Land Models / April 2004

The loop is only there to bunch up the line and keep it from hanging down
from the chassis.  The length of the pressure line is designed to smooth out
the exhaust pulses and give a more consistent fuel pressure.  I guess on an
RC10GT, the pressure line is about 8 inches.

It doesn't necessarily "have" to loop. The point that you want a
decent length of pressure line and the loop is to keep it from
flopping around. I usually keep my pressure line around 8 - 10" long
and have it run through the chassis.

One could also argue that the loop could be used to prevent unwanted
fuel leaks if turned over. Engine off ofcourse.