The Cohline lines on the 617's are usually dark amber and worn out when you get your car. Look at them wrong, and they usually break. This line is used for fuel, oil, and the ALDA.
 
Here are the replacement Cohline lengths for your different setups:
 
Stock fuel filter
4mm line - 9" long
6mm lines - 8.75" primer pump, 6.375" check valve, and 12.25" T fitting
 
CAT/Donaldson filter
4mm line - 9" long
6mm lines - 8.625" primer pump, 5.875" check valve, and 9.75" T fitting
 
ALDA to Intake Manifold
4mm line - 21" long
 
Base kit includes 10" of 4mm line & 30" of 6mm line. Optional ALDA replacement line (4mm x 22").
 
DOES NOT FIT THE "M" PUMPS. ONLY FITS "MW" PUMPS.