Those stupid valve covers... One thing that helps is to really drop the valve cover with gasket onto the head a few times to seat the gasket. But, mine still leaks even after torquing properly and all that, so I'm going to be trying the mod where you file just a little off the valve cover where the stud holes are so it clamps more. Reportedly it'll never leak again. Should've had 6-8 nuts holding it on in the first place instead of 4.

The fuel filter nut might just need new o-rings. I got the Dorman metric o-ring set that has both sizes in it if you have that style of filter bolt. There's also the kind that has a crush washer. Either way you don't need to really crank it down, but it may need to be snugged up.

-Rog