No power to fuel pump on olds silhouette - 1997 Oldsmobile Silhouette

Is it an 94 or a 2004 Silhouette.You should hear a fuel pump when turning on the key (anytime after the key has been off for about 10 seconds) or whenever there is oil pressure.
If there is no fuel pump sound or fuel pressure when the key is turned on (this is the prime cycle) then crank the engine for at least 10 to 15 seconds to get oil pressure as this is the 2nd source of power to the pump and what powers the pump when driving.
Still no pump running?
Check fuse /wiring/connections/including ground.
Lastly..... New fuel pumps don't always work just because they are new,

Sounds like fuel pump may be going out and the fuel filter may also be clogged.

Most likely throttle position sensor is defective.

Forget the filter . for now you are looking at a fuel pump a fuel filter is a hopeful repair

In the tank.

You could very well have a pump that is weak and loses some of it's pumping power after it has gotten fully warmed up. Have you ever noticed a temporary improvement in power after refiling with cool fuel? A test drive with a fuel pressure gauge should tell the tale about pump condition. Usually a restricted filter will cause a starvation problem all the time instead of just after a long drive. It certainly wouldn't hurt to change the filter but I doubt that it is your problem.

Inside the gas tank, and no it is not easy, the tank must be removed.

You'd have to read the manual, under the fuse cover, or go to a junkyard and compare with another vehicle. Silhouette & Lumina APV are the same as far as motors and electrical parts are concerned. just make sure it's the same engine size

I have a silhouette and it had the same problem
Follow the fuel pump wiring harness to where it plugs into the floor of the van--pull the connectors apart--they will probably be corroded, and you will possibly have to change both wiring harnesses or connectors.

All you may have to do to confirm power to your fuel pump, is to turn the key to on (not start) and listen for a "humming" from gas tank area. If you hear a hum, you have power going to pump, if not, then start thinking relays, fuses etc. Do you get the "Hum". How did you arrive at it being pump for sure, what tests did you perform? Here's a link that will assist you.

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152801dbaf3