Mark,
Gascolator:
I have a gascolator installed on my fuel injected engine. But, I suspect it is there because at one point the airplane was not fuel injected with the first engine. (Before I owned it) That being said, I have never drained any water or debris out it before. Actually it has been a bit of a pain with a leaking seal and one more sump drain to check / maintain. If I were building I could see going without it and being just fine.
Fuel Lines:
I have replaced both fuel and oil lines on my firewall forward install. Having been there, done that, I'll share my advice.
I would recommend using steel braided Teflon hose. I get mine from Parker by the foot. Get what you need, plus some. I think this is the type of hose it is, but not positive.
Don't have the part number handy..
While your there, buy the fittings you need. Remember to tell them you need JIC fittings, not the stuff you find on a tractor, the angle is different. Take a male AN fitting with you so they can measure it and be sure. It helps to have the fittings to asses the
length you need and the bend radius out of the fitting. The clamp area might be longer than you think. I wrap the hose in masking tape before I cut it to keep the steel braid intact. Once you have the host cut to length, I slip the firesleeve over the hose first, before the ends are clamped on. This lets you use firesleeve that is one or two sizes smaller than normal because it doesn't fit over the fittings. Makes for a smaller overall hose which comes in handy in our tight cowls.
Haul the stuff back to Parker and have them clamp the ends. Keep in mind that if you are
using angled fittings, they need to be clocked accordingly. If I use an angled fitting, I be sure to have a straight fitting on the other end. Then you don't have to worry about keeping them clocked correctly. By the way, I wouldn't mention the word "Airplane" at your local Parker store. Just say Race Car, most of them use JIC fittings also.
I attached a couple pics of my new (and old) oil cooler lines I just replaced. One shows the lines before the ends were clamped. Sorry for the poor quality.. cell phone in the hanger, you know the deal.
Tom McNerney