I have a 1976 17' Galaxy with what looks to be about a 25 gallon aluminum
tank mounted up front. The previous owner was using a portable tank for
the boat because there is a clog from the other tank.

Here is what I have done-
-Tried to blow (just by mouth) back through the tank (did not work)
-Removed the hose on both ends and made sure that is clear by blowing
through it (it is fine)
-removed the nozzle that screws in the tank and replaced the one it had
with a new one (the old one had some kind of a flow back preventer on it)
-Tried removing the tank (boy thats a job) I spent about 4 hours on trying
to get it out, but the way the boat deck is laid out it probably wont be
able to come out without many hours more work.
-I have drained all the fuel out of the tank that I could, it is still
clogged.
-I thought that maybe if there was some kind of a line flushing fluid that
you would suggest that would be great!! The problem is in the tank itself.
I dont really want to start jamming a coat hanger in there down the line (I
can see when I move it to the hole where the gas cap is normally) ( I have
the tank loose in there still) There seems to be a screen type unit in the
tube, I think it belongs there?? I am willing to punch through it down the
tube but I just want some support on doing that first.

Right now I have it hooked to a hose and I am trying to run some Carb
Cleaner back down through it to see if that will remove the problem.

Thanks,
Doug