I am not gaining weight with my tube feeding any tips. I have gastroparesis

Nutritionist. It sounds like you need to see/work with a nutrionist/dietician - who specializes in those requiring tube feeds. Several things could be going on like suboptimal caloric intake, suboptimal absorption of tube feeds or increased metabolic needs related to associated ailments that you may have. It's hard to give nutrition advice without a comprehensive understanding of whats going on. Best of luck.