NEVER bolus feed the J-port of a GJ tube-Tuesday Tube Facts Jun 1, 2021 | Tuesday Tube Facts Did you know…? It is important to NEVER bolus feed the J-port of a GJ tube. The intestine is not able to hold as large of a volume as the stomach can. It is not uncommon to see continuous feeds of 20 hours a day or more with GJ tubes, especially at the beginning of feeding. References: Feeding Tube Awareness Foundation. Gastro-Jejunal (GJ) Tubes, 3 Mar. 2020, www.feedingtubeawareness.org/gj-tubes/.