My fuel gauge started jumping around when the fuel got low then when I filled it up it stay's pegged on full.I'm guessing sending unit but if I'm going to change that should I just go ahead and put in a new pump while I'm there?and I also wanted to know if the fuel pump for a 5.7 of the same year will work on the 3.8?looking forward to all replies.:confused:

What year is it??