out of gas with 1/2 tank????

[old300e]

Heres a good one...

havent driven the merc for a week and took her up to Walmart today. Car was putting in the lot and stalled - just like running out of fuel. several cranks and nothing...

The fuel gauge had been acting inconsisitent - so I thought to put some gas in and see (couldnt remember when I last got fuel) - car had sat for about 1/2 hour while getting the gas - started right up and drove to the near shell station.

I was disappointed when it only took 7 gallons I drove the car home and let run for about 1/2 hour w/o issue...

Here are my questions:

What fuse is for the fuel pump - no fuse listed on the box says fuel.

Do fuel pumps act up before they die - I thought they died / stayed dead...

Is there a "pickup tube" or such in the tank? I may have to wait to get to 1/2 tank to see if the issue comes back...

thanks for any thoughts

Don