Where can i get a wiring diagram for fuel pump?

Doesn't have one . Looking at a wiring diagram to view fuel pump electrical circuit would show that . Do you know what automotive electrical wiring diagrams are ? Do you know how to use one along with a DMM - digital multi-meter to test electrical circuit's ? The fuel pump is controlled by the PCM - engine computer by energizing the fuel pump relay .
Free wiring diagrams here http://www.bbbind.com/free_tsb.html
Enter vehicle info. year , make , model ! Under system click on engine ,then under subsystem click on fuel controls . Click the search button then the blue link. Scroll down to the fifth diagram .Fuel pump electrical circuit .
Fuel Pump Electrical Circuits Description and Operation

Go to http://bbbind.com/free_tsb.html free wiring diagrams ! Enter vehicle info. Then click on engine under systems , then fuel controls under subsystem . There you will find fuel pump electrical circuit diagram ! Here is a testing GM fuel system video ! GM Fuel Pump Relay Testing

They are 2 ways to get this. An internet search using your year make and model car with the term fuel pump wiring or wiring diagram usually pulls up a collage of good diagrams. Or the autozone site has a help site at the bottom of its help page, There is a free part and a pay part, but free info will supply diagrams.

personal mods?

The fuel pump assembly consists of fuel pump relay,fuel sensor,the fuel pump controlling fuse,its ECM B fuse. The fuel pump and oil pressure switch. ----------- For its wiring diagram, click the link below and refer the diagram:--- http://technoanswers.blogspot.com/2011/10/fuel-pump-wiring-diagram-for-1998-chevy.html ----------- This should help.Thanks.Helpmech.

Hope this is what you need?

Grey is the power to the fuel pump.
Purple is the power to the fuel level sensor.
One black wire should go to the frame (fuel pump ground).
The other black wire should go to a connector and back to the fuel guage.

CHECK FUEL PUMP FUSE.AND SCAN CAR FOR PCM FAULT CODES.PCM CONTROLS THE FUEL PUMP.A HAYNES REPAIR MANUAL HAS FUEL PUMP DIAGRAM.

See page one at the pdf link below.
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=18451

does the pump make noise if yes change filter