Primer lines need to be silver soldered into their fittings. Using RTV to fix a leak is not acceptable and poses a serious fire hazard.
In Case You Missed It
Velocity U
You could probably figure out how to fly one on your own, but it wouldn’t be pretty. Velocity will show you how.
Plastic Tubing No-No
The symptom was a static system that leaked like a sieve when tested. Further...