fied separator change from the shell command line

Hello,

I'm trying to change the usal "|" table field separator from the shell
command line:
psql -d ect -f pl_lost.sql -o pl_lost.out.txt  -F "\t" -U asaadmin

But it doesn't work. It keeps the same "|" separator in the output
file.
Can anyone please help me?
I need to output to a tab separated file. Can anynone hel me with this?

Thanks in advance,

PJO