are the brake lines on a 1989 toyota pickup regular cab

all steel? an to get to them do u have to drop the gas tank
to get to them, cause i got a pretty bad leak coming from that area

 

also is located on the passanger side comin from the top of the fuel tank

 

Yes, they are all steel and you will most likely have to drop the tank

 

would it work if i cut both the steal lines infront of the tank an the back of the tank then feed 2 peices of steal tubing through there and connect them back together
with some pressure couplings?

 

Booty fab usually ends up being a bigger pain in the butt than if you do it right from the start.
Easiest thing to do is drop the gas tank, actually FIND the leak, and fix the brake lines.

Title edited for clarity and purpose.

 

i did find the leak its in the perfect spot to where u cant reach it an pretty much the only way to get to it is to drop the tank

 

While you got the tank dropped, drain the gas and flush the tank, check your fuel pump/pickups, check the frame there by the gas tank for rust, clean stuff up, put a new coat of paint on your gas tank and gas tank skid...and oh yeah...fix the brake lines.

 

ill have to do that in the summer cause its winter here now an my family puts their cars in the garage an i hav eto lay on the ice to fix anything lol

 

If you drop the tank you will have to replace your sending unit in the tank and you may have problems with the bolts that hold it in ( the lines may brake droping the tank since your brake lines are rusted then so will the fuel lines). You are into a whole other headache.
I would just cut the line and get out what you can and run a new one from the front to back.

 

Yeah new one front to back sounds like the way to go

 

I also suggest new lines front to back. Much easier. Buy a roll of the coated steel brake line. It will last much longer than uncoated steel lines, for just a bit more money. Buy the fittings you will need, get yourself a double flaring kit ($30) and a tubing bender ($15), and make your own lines. It is quite easy if you take your time, and doesn't require dropping the fuel tank.