If not used much, it may tend to corrode inside the tubes. If it is trying, at least the pump works. Might remove the lines and blow air thru them to clean them some. May just be plugged right at the tips too. Clean them gently....I use Awesome (at the Dollar Stores) for jobs like that.
Panama City, Fl.
I wake up in the morning with nothing to do and by supper time, I have half of it done.
2000 Lightning, s/c, tuned, Basanni, built tranny
Sold them all.....
Previous Mustangs:4 - '66 Coupes(silver/blue/grey/red) '87 GT HO, '00/'02/'07 GT Vert(red)(grey)(black), '68 Coupe, '11 GT/CS, 08 GT Vert