77 440 Motor Home

I know this isn't an A body but you guys are so smart, figured this is my best bet. OK, here it goes:

My renter has a 77 dodge family wagon motor home with a 440. He drove it in about a year ago and parked it, with plans to fix it up. Now he wants to get rid of it. I want to help him sell it, but can't get it running.

Here is what I know:

1. It will fire up if you spray starter fluid in the carb.
2. It has 5 gallons of fresh gas in the tank (gauge reads empty, probably sender)
3. The carb isn't getting gas. I have removed the fuel line from the carb and turned it over and it seems the mechanical fuel pump is not pulling fuel from the tank.

I don't want to just throw parts at it. Any thoughts? It is weird because it ran and drove a year ago.

77 440 with a 4 bbl