New GMC Duramax LB7 Fuel Lines Plus Refundable Core Charge $620 + 600 = $1220 (Core Charge will be refunded when you return your old fuel lines).
NOTE Regarding Industrial Injection LB7 Injector Warranty:
Fuel Lines and Fuel Filter should be replaced when replacing LB7 injectors. Failure to replace all 8 Fuel Lines & Fuel Filter can result in termination of warranty if Any debris found in an injector that you have returned for warranty. You do not have to have your lines cleaned through Industrial, but we recommend you your lines cleaned or purchase new lines through a dealer.
You can send in your own fuel lines and have them cleaned and avoid core charge.