Preheat your to 225 degrees.
Season the tenderloin with salt and pepper. Drizzle with olive oil and rub into the meat. Place on the grates of your preheated .
Smoke the tenderloin for about 3 hours or until the internal temperature reaches 130 degrees.
Remove the tenderloin from the grill, wrap loosely with aluminum foil and let rest for about 10 minutes. Slice and serve.