Use a good grade fuel line of same size. It is either 5/16 or 3/8 hose, cant remember for sure. Available at any good parts store. Just take a piece of your old hose for matching size. Be sure and refill cooling system with the G-05 coolant requirement.
Fuel line is rated for much more pressure than your cooling system will ever see!
I had to do this last year on mine before I removed the EGR & cooler and all associated hoses/plumbing this year.
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited 
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve