I have 99 F150 4.6L and I was under the hood and just noticed that there was scattered rust on the fuel rails. I couldn't scratch anything off so I am guessing that it is just confined to the surface but not really sure.
Is this normal ageing and should I worry about it? I would not have expected the stainless on these to have any rust at all. I really love this truck but If I have to replace the rails, the truck goes into Pick and Pull.

Thanks

Jim