Timscott, could you take a few mins. and fill out a " Signature Line ". From the "User CP" left hand side, grey box, " Edit Signature " and put in your RV's info year, engine ,etc. your signature will appear below your post and save those looking to provide help from going looking in your personals for the info. Right now I'm assuming 454
A mechanical fuel pump, would be mounted on the engine. Is that where you found yours? And sitting for 5 years you could have holes rusted through the fuel lines in that case the pump won't pull anything from the tank.
If what you found is not on the engine can you post a picture ?