Fuel pump <em>Nissan Almera G15</em>: how to check and replace it yourself

Nissan Almera G15 — a popular sedan with a reliable 1.6-liter engine HR16DE, but even he has weaknesses. One of them is fuel pump, which starts to act up over time. If your Almera starts to have trouble starting, stalls while driving, or jerks during acceleration, it may be his fault.

In this article we will look at how diagnose fuel pump malfunction, what symptoms should alert you, how to choose a high-quality analogue or original, and what you need to replace it yourself. And also - unique design nuances of the Almera G15 that if you don’t take into account, you will break the pump during installation.

Signs of a faulty fuel pump Nissan Almera G15

The fuel pump on the Almere G15 is electric, submersible type, located in the gas tank. Its main task is to supply fuel under pressure of ~3.5 bar to the injectors. When the pump wears out, the pressure drops and the engine begins to starve. Here are the key symptoms:

• 🔴 Engine won't start the first time or requires a long cranking of the starter - the pump does not create the required pressure when starting.
• 🚗 Jerks and dips when accelerating (especially at speeds of 60–90 km/h), fuel is supplied unevenly.
• 🛑 Auto stalls while driving, then starts only after the pump has cooled down - a sign of overheating or wear of the brushes.
• 🔊 Hum or whistle from the gas tank - the pump bearings are worn out.
• ⚡ Check Engine with errors P0171 (lean mixture) or P0190 (fuel pressure sensor circuit malfunction).

There is one feature on the Almere G15: if the pump dies, The car may start normally when cold, but stall when hot.. This is due to the fact that when heated, the resistance of the pump windings increases and it loses performance.

⚠️ Attention! If you experience jerking after refueling at an unfamiliar gas station, drain the fuel first! In 30% of cases, “pump symptoms” are caused by bad gasoline, not a breakdown.

How to Test a Fuel Pump: 3 Working Methods

Before replacing the pump, make sure that this is the problem. Here are three diagnostic methods that work for Almera G15:

1. Checking fuel pressure

Normal pressure for HR16DE — 3.3–3.7 bar at idle speed. To check, you will need a pressure gauge with an adapter for the fuel rail. Connect it to the fitting on the ramp (it’s under the cap next to the first injector) and measure:

• 🔹 Pressure when turning on the ignition (should jump to 3.5 bar and hold for 5-10 seconds).
• 🔹 Pressure at idle (should not fall below 3.0 bar).
• 🔹 Pressure at 3000 rpm (should increase to 4.0–4.5 bar).

If the pressure is below normal, the pump is faulty. If there is pressure, but the engine is shaking, check fuel pressure regulator (it is built into the pump) or nozzles.

2. Checking the voltage to the pump

Disconnect the pump connector (it is under the rear seat, under the hatch cover) and check with a multimeter:

• 🔋 Voltage on red wire (plus) when the ignition is turned on - there should be 12 V.
• 🔌 Weight per black wire - the resistance to the body should be close to 0 ohm.

If there is no voltage, the problem is in the pump relay (it is in the fuse box under the hood, relay No. 5) or in the wiring. If there is voltage, but the pump does not hum, it has burned out.

3. Performance check

Remove the return hose from the fuel rail and direct it into a measuring container. Start the engine and measure how much fuel the pump pumps in 1 minute. The norm for Almeria G15 is 1.2–1.5 liters per minute. If less, the pump is worn out.

Which fuel pump to choose for Nissan Almera G15: original vs analogues

The original pump from Nissan has the article number 17040-JM00A (for models up to 2017) or 17040-JM01A (after restyling). Its average price is 8,000–12,000 rubles. But there are proven analogues that are cheaper:

Brand	Article	Price, rub	Features
Bosch	0 580 454 035	5 500–7 000	High reliability, but may be noisier than the original
Denso	950-0101	6 000–8 500	The best option in terms of price/quality ratio
Valeo	583001	4 800–6 500	Budget option, but the resource is 20–30% less
Sasic	2000146	3 500–4 500	Low price, but often counterfeited - buy only from authorized dealers

When choosing an analogue, pay attention to:

• 🔧 Body length and shape — on the Almere G15 the pump has a unique bend; not all analogues are suitable.
• 🔌 Power connector - must match the original (on some Chinese pumps the contacts are mixed up!).
• 🛢️ Presence of a check valve - without it, after stopping the engine, the pressure in the system will be released, and the car will have difficulty starting.

⚠️ Attention! After 2018, pumps with modified fuel level sensor. If you buy a pump for an older model, the fuel gauge needle will lie!

How to distinguish a fake Bosch from the original?

The original Bosch pump has:

- Bosch logo engraved (not a sticker!)

- Matte plastic body (fakes have a glossy one)

- The inscription "Made in Germany" or "Made in Japan" (Chinese fakes write "Made in China" in small print)

- Comes with an O-ring marked Bosch

Step-by-step instructions for replacing the fuel pump with Nissan Almera G15

Replacing a pump on an Almere G15 takes ~1.5–2 hours. You will need:

• 🔧 Set of sockets and wrench 10 mm.
• ✂ Knife or flat screwdriver (for removing the hatch).
• 🧴 Sealant for fuel systems (for example, Loctite 577).
• 🧤 Gloves and rags (gasoline is aggressive for the skin!).

1. Disconnect the negative terminal of the battery

2. Relieve pressure in the fuel system (pull out the pump fuse and start the car until it stalls)

3. Drain the gasoline from the tank below the pump level (or work on an empty tank)

4. Prepare a fire extinguisher (gasoline is highly flammable!) -->

Step 1: Removing the rear seat and hatch

Lift the rear seat cushion (it is secured with latches - pull it up). Below it you will see the fuel pump hatch. Carefully pry it up with a knife or screwdriver and remove it. Be careful - there may be dust under the hatch, which, if it gets into the tank, will clog the new pump!

Step 2: Disconnecting connectors and tubes

Disconnect:

1. Electrical connector (press the lock and pull up).
2. Fuel hoses (press the plastic latches on the sides and remove the fittings). Be prepared for gasoline splashes!

Step 3: Removing the Old Pump

Unscrew the 8 bolts securing the pump flange (head on 10 mm). Carefully lift the pump and float assembly. Do not turn it over - the float may break! Drain the remaining gasoline from the glass.

Step 4: Install the New Pump

Transfer the fuel level sensor float from the old pump to the new one (it is secured with latches). Install a new O-ring onto the flange and lubricate it with sealant. Lower the pump into the tank, aligning the arrow on the flange with the mark on the tank (it should point towards the trunk!).

Tighten the bolts crosswise, connect the hoses and connector. Before starting the engine, turn the ignition on for 5 seconds 3-4 times to allow the pump to fill the system with fuel.

Common mistakes when replacing a pump and how to avoid them

Even experienced craftsmen sometimes make mistakes that lead to repeated disassembly. Here are the most common:

• 🔧 Mixed up hoses — on the Almere G15 the fuel supply hose (from the pump to the ramp) is thinner than the return. If they are swapped, the engine will not start.
• 🔌 Damaged connector — when the wire is disconnected, the latch is often broken. If the contacts are not tight, the pump will work intermittently.
• 🛢️ Dirt in the tank — if you don’t rinse the tank before installing a new pump, the filter mesh will become clogged within a week, and you’ll have to repeat everything.
• 🔩 Loose bolts - if the pump flange is not pressed tightly, there will be air leaks and the car will stall.

Another typical problem is incorrect float installation. If it clings to the walls of the tank, the fuel gauge needle will jump or show the wrong level.

1. Disconnect the battery terminal for 10 minutes.

2. Start the car and let it idle for 5 minutes.

3. Drive 10–15 km with smooth acceleration.

This will help the ECU get used to the new pump.-->

How long does a fuel pump last? Nissan Almera G15 and how to extend its life

Average service life of the original pump - 150,000–200,000 km. But in practice it fails earlier due to:

• 🛢️ Bad fuel — additives and dirt in gasoline accelerate wear of brushes and bearings.
• 🔥 Overheating — if you often drive with an almost empty tank, the pump overheats (gasoline cools it!).
• ⚡ Power surges - a faulty generator or a dead battery will shorten the life of the pump.

To extend the life of the pump:

1. Refuel at proven gas stations (preferably Lukoil, Gazpromneft, Rosneft).
2. Do not allow the fuel level to drop below 1/4 tank.
3. Change fuel filter every 30,000 km (it protects the pump from debris).
4. Periodically add injector cleaner (for example, Liqui Moly Injection Reiniger).

FAQ: Frequently asked questions about the fuel pump Nissan Almera G15

Is it possible to drive if the pump is noisy, but the pressure is normal?

If the pressure is stable and the noise is not accompanied by jerking, you can drive, but the pump is already worn out. Noise usually means the bearings or brushes are at their limit. We recommend replacing the pump within the next 1-2 months to avoid being left with a non-functional machine.

Why did the car become harder to start after replacing the pump?

Probable reasons:

• Fuel hoses are connected incorrectly (supply and return are mixed up).
• The ECU adaptations have not been reset (you need to remove the battery terminal for 10 minutes).
• The new pump is defective (check the pressure with a pressure gauge).
• Air leakage through the flange sealing ring.

Which pump is better - Bosch or Denso?

Both brands are reliable, but there are nuances:

• Bosch - a little more powerful, better suited for aggressive driving, but can be noisy.
• Denso - quieter, resource is 10–15% higher, but more expensive.

Optimal for a quiet ride around the city Denso, for the route and loads - Bosch.

Can the pump be repaired or is it just a replacement?

Repair is possible if the problem is:

• Clogged filter (can be washed).
• Worn brushes (repair kits available).
• Oxidized contacts (cleaned).

But if the winding is burned out or the bearings are worn out - only replacement. In 80% of cases, repairs are more expensive than a new Chinese pump, and therefore are not economically feasible.

Where is the fuel pump relay located on Almere G15?

The pump relay is located in the fuse box under the hood (driver's side). It is marked as Fuel Pump Relay or RELAY 5. To check, swap it with the fan relay (they are the same). If the pump starts working, the relay is faulty.