Two problems related to fuel pump have been reported for the 2003 Nissan Frontier. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Nissan Frontier based on all problems reported for the 2003 Frontier.
Fuel tank assembly - the top of the fuel tank where the fuel pump/sending unit bolts into the tank rusted/corroded causing a vapor leak and the check engine light to come on. This required cleaning/removing rust/corrosion resealing assembly to return vehicle to usable condition.
My vehicle fuel pump failed and nearly caused me to crash. I have located NHTSA # 04v230000 that notes a recall. The dealer says that my VIN number was not part of the faulty pumps that were placed in the vehicles. I want to add that these other fuel pumps are also no good. I am in the coast guard and my vehicle has been near the salty ocean air since I've owned it (the same reason for the corrosion on the other pumps). There should also be a recall for these pumps.