Joe Ford opened the scoring with a penalty for the Jets after Gloucester infringed at the breakdown.
The visitors however hit back when Lewis Ludlow touched down and Jonny Bentley converted.
Five minutes into the second half saw Joe Ford reduce the arrears to one point (6-7) with his second penalty, but it was short lived as Jonny May burst through and passed to Luke Hume to score. Bentley's conversion attempt missed but Gloucester led 6-12.
The Jets battled hard in the wet conditions to find a way back and it finally came with Mike Haley's try and Nathan Fowles conversion
Final Score Sale Jets 13 Gloucester United 12