GMC Repair: GMC Safari ignition switch, negative battery cable, gmc safari

Question
How do you replace ignition switch on a 1998 GMC safari van. Could it cause the fuel pump to stop randomly but only when starting not when driving. The fuel pump has been replaced.

Answer
Hi
I have learned ANYTHING is possible from an ignition switch.
******FIRST disable the air bag system...*******
You'll need to remove the upper and lower steering column covers.
Also all the trim under the drivers side, kneee bolster, etc...
The ignition switch has 2 screws holding it on.
Remove those screws and all related wiring harness.
Then the switch.
Here is the procedure from GM......

Place the multifunction lever in the center or the OFF position.
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

Disconnect the battery negative cable.
Disable the SIR system.
Remove the steering wheel inflator module.  
Remove the horn plunger contact.  
Remove the steering wheel.  
Remove the tilt wheel lever.
Remove the ignition lock cylinder. Remove the upper steering column trim cover.

I Hope this helps
PAwl