How to use grilling chunks on your propane grill: First of all, grilling chunks are supposed to burn/smoke to flavor your entrée. Therefore, forget about soaking them before using. Normal grilling time is about 15-20 minutes. If you soak your chunks, all you will get is steam when what you really want is SMOKE! Keep a spray bottle of water handy to control flare ups or close off the air supply to briefly extinguish flames.
Propane, electricity, charcoal are all heat sources. Your grilling chunks provide the flavor. In order to provide the smoke flavor of your favorite wood all you need to do is place four or five chunks around the perimeter of your GRILLING SURFACE. DO NOT place them on your heat source. Your propane or electric grill is not designed to use wood as a heat source.
When the grilling chunks begin to smoke, add your entrée, and close the lid to your grill. The meat or fish will absorb the flavor of the wood smoke.
If your heat source is charcoal, simply toss your grilling chunks onto the charcoal when you are ready to grill.