I have read a lot of posts of members losing prime but mine has a variation. Instead of the usual start and then die that most have, mine starts and idles, even runs fine but every now and then it starts to stutter and die while driving. This is happening while it is about 20F out and I am on the highway or on the gas. The other night I couldnt get my truck over 65. If I gave it more than 1/2 throttle it would fall on its face. I pulled over, shut it off and pumped up the primer. It was better after this but this cant be normal. The filter is about 7K/4months old and there is no apperent leaks on or around the bleeder screw. I took it out and inspected it, replaced it with some silicone grease around the o ring. This is a perplexing problem.