The aircraft struck a 2-ft high avgas pump while the pilot was taxiing around another aircraft that was parked. The nose gear collapsed and a small fire resulted. The pilot and passenger evacuated the aircraft. Line personnel were unable to extinguish the fire with hand-held extinguishers. The aircraft was subsequently engulfed by the fire and was destroyed. A large dry chemical fire extinguisher was located next to the pump at the time, but line personnel were unable to get to it due to the fire. The black top around the pump had recently been resurfaced and no safety markings, lights or barricades were in place around the pump (except for the large fire extinguisher). The pump was originally located next to the ramp edge, but subsequent expansion of the ramp left the pump surrounded by pavement. PROBABLE CAUSE: visual lookout .. inadequate .. pilot in command CONTRIBUTING FACTORS: airport facilities,obstruction marking .. inadequate other airport/runway maintenance .. inadequate .. airport personnel object .. airport facility