99 Nissan Altima Fuel Pump: Your Complete Guide to Replacement, Costs, and Troubleshooting
If you own a 1999 Nissan Altima and your fuel pump is failing, here is the bottom line: the fuel pump is located inside the fuel tank, accessible through the rear seat area, and replacing it costs between $300 and $900 total (parts and labor), depending on whether you choose an OEM or aftermarket part. A failing fuel pump will cause hard starting, engine sputtering, loss of power, or stalling. The good news is that replacing it is a manageable DIY job for an experienced home mechanic, and you can save significant money by doing it yourself.
What the Fuel Pump Does in Your 1999 Altima
The fuel pump in your 1999 Nissan Altima is an electric pump submerged inside the fuel tank. Its job is to deliver fuel from the tank to the engine at the correct pressure and volume for proper combustion. The pump is designed to be self-priming and operates quietly because it is surrounded by fuel, which also helps keep it cool and extends its lifespan.
The fuel system works as a closed loop. The pump draws fuel through a filter sock (strainer) to catch large debris, then pushes it through the fuel filter, up the fuel lines, and into the fuel rail. The fuel pressure regulator maintains the correct pressure, typically around 34-38 PSI for the 1999 Altima, and any excess fuel is returned to the tank via a return line.
Symptoms of a Failing Fuel Pump
Recognizing the signs of a bad fuel pump early can save you from being stranded. Common symptoms include:
- Difficulty Starting – The engine cranks but takes longer than normal to start, especially when cold. This happens because the pump cannot build enough pressure quickly.
- Engine Sputtering at Speed – The car may hesitate or sputter while driving, particularly at highway speeds or under load.
- Loss of Power Under Load – You might notice a lack of acceleration when going uphill or passing another vehicle.
- Sudden Stalling – The engine may shut off unexpectedly while driving, often without warning.
- Whining Noise from the Fuel Tank – A healthy pump makes a quiet humming sound for 2-3 seconds when you turn the key to the ON position. If you hear a loud whining or screeching noise, the pump is failing.
How to Test the Fuel Pump Before Replacing It
Before spending money on a new pump, perform these simple tests to confirm the pump is the problem:
1. Listen for operation. Turn the ignition to the ON position without starting the engine. You should hear a humming sound from the fuel tank area for 2-3 seconds as the pump primes the system. If you hear nothing, the pump may be dead.
2. Check fuel pressure. Use a fuel pressure gauge connected to the fuel rail test port. For most Nissan Altima models, the fuel pressure should be between 49 and 56 psi. If the pressure is significantly lower or drops quickly after the pump stops, the pump is likely failing.
3. Scan for diagnostic trouble codes. Use an OBD-II scanner to check for codes like P0087 (Fuel Rail/System Pressure Too Low) or P0230 (Fuel Pump Primary Circuit Malfunction). These codes point directly to fuel delivery issues.
4. Check voltage at the pump connector. Using a multimeter, measure the voltage at the fuel pump electrical connector with the ignition on. You should see approximately 12 volts. Low or no voltage indicates a wiring, relay, or fuse problem rather than a pump failure.
Cost of Replacing the Fuel Pump on a 1999 Altima
The fuel pump assembly for a 1999 Nissan Altima typically costs about $100 to $500 for the part itself, with installed costs usually in the $300 to $900 range depending on where you shop and the options chosen.
Here is a breakdown of typical price ranges:
- OEM Nissan dealership new fuel pump assembly (with sending unit): approximately $350–$550
- Aftermarket new or remanufactured pump (Cardone, Bosch, Delphi, etc.): approximately $100–$250
- Used or salvage-yard unit (tested, may not include sending unit): approximately $40–$120
- Remanufactured module from third-party suppliers: approximately $120–$240
- Labor for installation: typically $150–$400, with total installed prices commonly ranging from around $300 to $900 or more if the fuel tank requires additional work or access is difficult.
Choosing the Right Fuel Pump: OEM vs. Aftermarket
When replacing your fuel pump, you have two main choices:
OEM (Original Equipment Manufacturer) parts offer the same fit and function as the original equipment and may carry a longer warranty, but they cost more.
Aftermarket and remanufactured pumps can save money and still provide reliable performance, but warranty terms and fit can vary. Always confirm compatibility with your exact vehicle configuration and review warranty details before purchasing.
Regardless of which option you choose, use a high-quality replacement fuel pump from a reputable brand. An aftermarket pump from an unknown manufacturer may not last as long or deliver the correct fuel pressure. Consider a brand like Denso, Bosch, or Delphi.
Step-by-Step Guide to Replacing the Fuel Pump on a 1999 Altima
Replacing the fuel pump on a 1999 Nissan Altima is a task recommended for experienced home mechanics or others very familiar with automotive fuel systems. The procedure will take approximately one to two hours.
Important Safety Precautions:
- Work outside or in a well-ventilated area; fuel vapors are flammable.
- Do not smoke, use sparks, or have hot work lights near the car.
- Relieve fuel pressure before disconnecting any fuel line to prevent spray.
- Disconnect the 12V battery negative cable before opening the tank.
- Keep a class B fire extinguisher nearby.
Tools You Will Need:
- Safety glasses and nitrile gloves
- Class B fire extinguisher
- Phillips screwdriver
- 8mm and 10mm sockets
- Ratchet and torque wrench
- Fuel pump lock ring tool (J-38879 or equivalent)
- Fuel line quick-disconnect tool set
- Shop rags and a catch pan
- Replacement fuel pump
- Replacement O-ring gasket
Step 1: Relieve fuel system pressure. Remove the fuel pump fuse from the passenger side fuse box (located in the passenger side footwell). Crank the engine and let it run until it stalls. Then, crank the engine again to completely relieve the fuel system pressure. Turn the engine off and remove the key.
Step 2: Disconnect the negative battery cable. Use pliers to loosen the nut around the cable and lift it away from the terminal.
Step 3: Access the fuel pump. Pull the straps along the bottom of the rear seat cushion to remove it from the floorboard. The fuel pump access cover is underneath the rear seat cushion.
Step 4: Remove the access cover. Remove the four Phillips head screws from the fuel pump access cover. Lift the cover away to view the fuel pump assembly.
Step 5: Disconnect electrical and fuel lines. Disconnect the electrical harness attached to the assembly. Then carefully pull off the two hoses using a pair of pliers to open the clamps. Label or mentally note the hose connection ports so you do not crisscross them when installing the new fuel pump.
Step 6: Remove the locking ring. Matchmark the locking ring per its position by making a small mark on the ring and the vehicle. Use the fuel pump locking ring tool (J-38879) to twist and remove the locking ring. Do not attempt to remove it with pliers or other tools, as this could cause damage.
Step 7: Lift out the fuel pump assembly. Carefully lift the fuel pump assembly from its mount. Detach the fuel pump from the assembly by pinching the two tabs together. Insert the new fuel pump into the assembly.
Step 8: Replace the O-ring gasket. Remove the old o-ring gasket from the assembly. Attach the new o-ring gasket to the assembly.
Step 9: Reinstall the fuel pump assembly. Re-insert the fuel pump assembly into its mount. Attach and tighten the locking ring using the tool. Line up the matchmarks to prevent over-tightening or under-tightening.
Step 10: Reconnect everything. Re-attach the electrical harness and the fuel pump lines per their original position. Reinsert the fuel pump fuse into the passenger side fuse compartment. Reconnect the negative battery cable.
Step 11: Prime the system. Insert the key and cycle it between "ON" and "OFF" a few times, back and forth. This will help rebuild system pressure.
Step 12: Start the engine. Start the engine and inspect the fuel pump area and connections for leaks. Turn the engine off, replace the fuel pump access cover, and tighten the screws. Replace the rear seat cushion to finish.
Important Tips for a Successful Replacement
Replace the filter sock. Always replace the fuel filter sock (strainer) when you replace the fuel pump. A clogged filter sock can cause the new pump to fail prematurely.
Consider replacing the fuel filter. The fuel filter is typically located along the fuel line. A clogged fuel filter can strain the fuel pump and reduce its lifespan.
Keep everything clean. Debris in the fuel tank can damage the new pump. Vacuum and wipe around the pump module before opening the tank.
Check fuel lines. While you are in there, inspect the fuel lines for any signs of damage or corrosion. Replace them if necessary.
Ensure proper grounding. A poor ground connection can cause the pump to overheat and fail.
How Long Does a Fuel Pump Typically Last?
Most fuel pumps in the Nissan Altima last between 100,000 and 150,000 miles, but this can vary depending on driving conditions and maintenance. The single most effective way to extend the life of your fuel pump is to keep it cool and clean. This means never letting your fuel tank drop below a quarter tank, as the fuel helps cool the pump. Running the tank low frequently can cause the pump to overheat and fail prematurely.
Recommended Fuel Pump: KEMSO Brand
If you are looking for a reliable and high-performance replacement for your 1999 Nissan Altima fuel pump, we strongly recommend the KEMSO Fuel Pump. KEMSO specializes in high-quality fuel pumps that serve as ideal direct OEM replacements for stock OEM pumps that have gone faulty.
The KEMSO 340 high pressure pump is capable of supporting applications of up to around 700-800bhp, making it suitable for daily drivers, fast road use, or if you are simply looking to upgrade or replace your faulty fuel pump. Each KEMSO pump is individually tested for quality and flow, and the company stands behind its products with a lifetime free replacement warranty. If there is any issue of any kind at any time, KEMSO will replace the pump free of charge.
KEMSO fuel pumps are designed for both gasoline and E85/ethanol, and they feature gradient density fuel strainers for superior contaminant filtration. The pump is a direct drop-in replacement, meaning no modifications are needed for installation.
Visit KEMSO's website to browse their selection of fuel pumps and see why they are a trusted choice among automotive enthusiasts and professionals: