Fuel Tank....Vac Diagram '91 2600i

Help,
I'm a newB. I was on line looking for Mazda info and found the BScene. I've got a 91 B2600i 4x4, the 4wd won't lock up. I think it's vacuum related and wonder if anyone has a Vac diagram?
I've also got a fuel leak, I think its the tank. Anyone ever done one. Any suggestions would be greatly appreciated. It is the CabPlus
Thanks,

Ray

i would try auotforums.com or
mazda forums lots of 4x4 guys there could prolly help ya out