Hello everyone, hey I have a 1993 OMC Sunbird that I have a question
regarding the fuel tank fitting.
Before I prepped the unit for storage last fall i noticed i wan't
getting any fuel to the pump. I found out the aluminum one way valve in
the fuel line connected to the fuel tank was corroded and defective.
When I tried to remove it it broke off in the 90 degree fitting that
screws into the plastic fuel tank. The 90 degree fitting seems to be
threaded into a large nut that's not very thick and bonded or molded
into the fuel tank. I tried to unscrew the 90 degree fitting from the
nut but it seems pretty tight and I couldn't get it to budge. My
question is...I should be able to remove this 90 degree fitting correct?
So I can get it out and replace it along with the valve.
I don't have much room through my access hole and would hate to damage
the tank and have to remove the floor to repair it.
Thought I would ask those who know.

P.S. there was a bunch of white corrosion on the aluminum valve and it
seemed to etch it really bad. What causes that?