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I have had problems with Tiger Loops. It seems that some will not prime after yearly burner maintenance. The filters and strainers are clean and the pumps check out OK. I usually jumper the cad cell and let it run and it primes. Not always. On the affected units, I have manually drawn oil from the tank with my Firematic jig pump. the burner fires, but soon loses prime. When I remove the TL completely, Voila!! It runs. My flare connections are all tight. The tiger Loops in question are older. The newest about 6 yrs., but most are over 10. Any advice will be appreciated.