Still having starting issues with me 87 GL.

I was not getting power to my fuel pump and have replaced the relays,
ignition switch, and alternator because I noticed the regulator was
bad due to the old alternator wobbling. Just finished a job replacing
fuel tank seals and new fuel filter.

Now I'm getting power to the fuel pump at least. Connected a test
light and it goes on when I turn the key, stays on briefly (a couple
of seconds) and then turns off. I understand this is normal. But,
there is no fuel getting to engine. Engine cranks fine, but does not
turn over.

I bought the fuel pump new a few years back, but my van has been
sitting for quite awhile.
Wondering now if the pump has "frozen" up from crap or water that may
have been in my tank. Is it possible to test for this? Is there anyway
to clean out the fuel pump or make sure it turns properly?

Man! I was really hoping that it would start right up today! Any other
suggestions?
THANKS!