For teh pump lid, make sure you lube it up good with silicone pool lube and tighten the lid down good, when you think it's tight, it will tighten a bit more, I found you have to hit it with a plastic pipe to get it loose again in most cases, but it's relatively easy and painless. (I use a plastic pipe since it won't damage the lid). Lids are the primary reason for sudden suction side leaks. Water coming out of teh lid - definite sign it's not on tight.
Pipe connections, I find every year I have to give them an extra little bit of a turn. if it's tigerflex try using a heatgun on the tube, then tighten, mine hasn't leaked for 2 seasons since I did that.
Drips from the cartrige filter - where? If it's at a pipe thread, try replacing the teflon tape, if that doesn't do it, maybe it's where the clamp is.