it's impossible to use the standard aba clamp on the connector into the racing tank.
i've made a special clamp.
i use standard gates summersible hoses(4219 code)
od is 14mm
i use the automatic clamp who i find on the trottle body hoses.
separate the inner half tube from the outer tube
i take a 14mm od punch
i use a pincer to close the clamp on the punch(the first i made it's broken with pincer..so..keep calm 😄)) )
i take clamp and punch on a spindle
with a punch and hammer i reduce the teeth untill the outer diameter of the clamp
check the maximum od is smaller than the id of the tank insert
open the clamp with a screwdriver(a little,just to insert the hoses)
riassemblate all
insert the clamp on the connector
insert the hose on the connector
put the clamp over the hose(it's difficult)
close the clamp in a vise to block it on the hoses
screw the connector 😉
photo here:
http://imgur.com/a/KJIoL
ciao
