UDP 5/16 in. I.D. x 7/16 in. O.D. x 100 ft. Clear Vinyl Tubing with Dispenser Box T10004006 - The Home Depot
Hose - Gas Hose (Red 5/16 ID, 9/16 OD)
STENS New 115-006 Fuel Line for 5/16 in. ID 1/2 in. OD Length 25 ft. Black PVC Oil Chemical & Gas Resistant, Smooth & Flexible 115-006 - The Home Depot
Gates heater hose 5/16" by the foot (GAT-516)
5/16" ID Fuel Line Hose 19/32" OD 10ft Oil Tubing Black for Small Engines - Walmart.com
Made in USA - 5/16″ ID, Hydraulic Hose - 45644887 - MSC Industrial Supply
JEGS 555-15995: Universal Fuel Hose | 5/16 in. I.D. x 25 ft. - JEGS