O.K. guys...here's the deal. I've finally replaced the rusted out areas in my trunk on both sides of the tank with new metal. After alot of grinding and sanding I have a newly painted trunk area that is reasonably smooth and awaiting the new tank that I bought from Laurel Mountain mustang. Since it's a new tank should I worry about flushing it with some gas before I install it? Also, the kit came with a rubber O-ring to seal the new sending unit to the tank. However, the ring is more oval than round and won't keep its shape despite the groove for it in the tank when I tried test fitting the sending unit last night. I thought about using a bit of silicone or vaseline to hold it in place while I put things together, but then had second thoughts about it. I don't want something to appear O.K. now and then cause the seal to break a month down the road when I'm driving the cat. Any opinions out there? Am I just looking too hard at this?