Ok I'm slowly addressing the lose of prime issues I'm having, and I started with a new WIF sensor (plus I wanted to have a backup one).

I do not have the special wrench from merchant, but I was very careful tightening the new one. I noticed that on both the old one that I took off and the new one on, that I can still see some of the o-ring in a gap from the bottom of the filter edge to the WIF edge of prolly .020". Is this normal? How tight are you guys getting these?

Moved to Maintenance and Fluids!

Yes sounds normal- it is a thick oring and it should not bottom-out. :)

OK, that's what I was thinking, but didn't know if using the special wrench would yield better results.

a adjustible works fine, just have the feel for not stripping the threads. but, i just bought a WIF wrench because i kept slipping off the WIF, they work nice.

WIF tool does not ruin the edges of the sensor. Buy the tool, you and your WIF sensor will be happier!

Yep - A WIF wrench for the WIF - and KD Push Pin Pliers for those wheel well fasteners. Actually I don't mine those funky plastic fasteners, easy out and easy in with the right tools.........

I have always hand tightened my wif and filter and never had a leak.

finger tight plus 1/2 turn and you should be good.

how much does a WIF sensor go for i broke a little piece off of mine doing a filter swap on the side of the highway is DC. it is still working but i want to replace it before i have any more problems.

my fuel filter is also leaking from around the top every once in awhile which cause the system to lose a prime and piss me off! anyone else ever have this happen. do i need a new mount or something?

I guess about $55.00. http://www.merchant-automotive.com/waterinfuelsensor.aspx