Nissan Altima fuel pump emits gas smell with black smoke and engine oil coolant issues on Nissan Altima

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Nissan Altima owners report experiencing issues such as a gas smell and black smoke, which may be indicative of a faulty fuel pump that could be leaking gas or providing insufficient pressure for proper fuel ignition. These problems can also stem from excessive fuel pressure, which can richen the air/fuel mixture and trigger the check engine light. Additionally, issues with the fuel pressure regulator may contribute to the gas smell and black smoke. Furthermore, some owners have noted engine oil coolant problems, which could signal a separate issue like a coolant leak or malfunctioning cooling system. It is advisable for owners to seek a professional mechanic's inspection to accurately diagnose these concerns and ensure timely repairs to maintain the vehicle's performance.

1 person reported this problem
0 comments
Schedule Repair

Nissan Altima vehicles with this problem

0 model year affected

Search for another problem

RepairPal Car Genius

Ask our experts about your Nissan.

RepairPal Car Genius™ is a free resource for vehicle owners seeking advice on maintenance, auto repair, shop inquiries, estimates, and finding a trustworthy repair shop in your area.

 Auto Repair Expert Auto Repair Expert

Call us at 877-913-1554

Available 9am – 6pm ET Monday through Friday

Call Our Experts