how can i find the fuel pump on a 2004 dts and is it hard to replace or remove on 2004 Cadillac DeVille DTS

i ran out of gas put gas in it dont hear fuel pump coming on

Asked by for the 2004 Cadillac DeVille DTS
they are in fuel tank and you may have 2 primary and secondary. seek proper daig and est as not to waste money.could also be wiring or relay issues