I am hoping the experts on here can help. I have an older Himalaya Multifuel stove that spits and flares when using paraffin. It’s fine with gas. It’s always done this from new. It was returned twice for testing but I suspect they only tested useing butane gas. I used an ergo pump from a newer stove and it still did the same. I am using the correct size 28 jet. Any ideas anyone.