Hopefully yall can help. 2013 ram 4.7 48k. Went to the store before work the other morning (4 miles) came out and truck wouldnt start. It starts on ether. Have power at the pump fuse and power to the pump. Small amount of fuel in the line, no pressure. Ground stud by tank was corroded, can here pump priming after making good connection. What else can i check before buying a new pump? Thanks guys.