Fuel pump Relay…?

[tundrarunner]

So I had fuel pump issues and found the reason. The plug in (fuse box) for the pump relay is melted… what causes this?? Something I need to do before fix? And what is the fix.

El pump, tundra

 

[gnob]

high resistance in that circuit.

 

[tundrarunner]

high resistance in that circuit.

Can you expand? Lol what does that mean? And what do I need to do