308GT4 heater hose replacement time

The hose that comes out of the side of the rear head failed, reminding me that I have been putting off replacing the small coolant hoses. I searched for the process for replacing this, I know I've seen threads on it, but didn't come up with anything helpful. I just need the answers I haven't been paying attention to before - does the gas tank have to come out, what length is it, etc.

The hose failed right at the hose clamp/nipple end, so I of course cut off two inches and stuck it back on and I'll be fine for a while, but this was a warning shot. And it was really nice of it to fail right there where it is easy to get to, easy to make a temporary fix and it didn't fail catastrophicly (sp? that's not right!). I was so relieved that it wasn't fuel leaking from the engine bay!

 

OK, so you guys haven't been a lot of help.
Today on a drive the hose sprung a leak again. Could have been that Perfusion and I running a few redline pulls on the San Jose Gand Prix course was just a bit too much for it. (Sure sounded good to have two Ferrari screams bouncing off the barriers!) The real issue is that the hose is delaminating and the interior looks like the crud Birdman had in his Mondial radiator.

So has anyone replaced these hoses? I've freed both ends of both the heater and the brake booster vacuum line and tried to pull both from the front and from the rear, but they seem attached to something. Does the fuel tank need to come out? Is there some secret access hatch somewhere?

Is the GT4 parts book available on line? Perhaps a drawing there would show how this is routed?

 

I don't see any rivets that look like the culprits. Are they visible from the outisde of the car or the inside? Looking at the parts book it looks like perhaps there is an access hatch on the side of the rear seat that may help see what is going on in there. Taking the fuel tank out isn't the answer I was hoping for! I just filled the car. I made stops for both ends of the heater hoses to run the car sans heater. I'll drive it a bit and get the fuel level down.

Yes, I already bought the hose also. The good vacuuum hose in that size was $5 a fooot! I bought 18 feet - probably too long, but easier and cheaper to cut two feet off that buy another long length. I'll probably tackle this project next weekend after draining off a bit of fuel.

Thanks!

 

I didn't even see #40 as an acess panel. Thanks!
Has anyone removed #6 from the same Tav. 102 drawing? Perhaps that gives the access necessary (better/different) to behind the gas tank.