You need:
1 1/2 pounds salmon fillets
lemon pepper to taste
garlic powder to taste
salt to taste
1/3 cup soy sauce
1/3 cup brown sugar
1/3 cup water
1/4 cup vegetable oil

1. Season salmon fillets with lemon pepper, garlic powder, and salt.
2. In a small bowl, stir together soy sauce, brown sugar, water, and vegetable oil until sugar is dissolved. Place fish in a large resealable plastic bag with the soy sauce mixture, seal, and turn to coat. Refrigerate for at least 2 hours.
3. Preheat grill for medium heat.
4. Lightly oil grill grate. Place salmon on the preheated grill, and discard marinade. Cook salmon for 6 to 8 minutes per side, or until the fish flakes easily with a fork.