Where is the fuel pump relay located on the <em>Nissan Almera Classic</em>: diagram, photo and step-by-step check

If your Nissan Almera Classic (models B10 or N16) suddenly stopped starting, and the starter turns, but the engine does not catch - the problem may lie in the fuel pump relay. This small but critical element is responsible for supplying voltage to the fuel pump, and its failure results in a lack of pressure in the system. Unlike the fuse, which is easy to find according to the diagram, the location of the relay often raises questions even among experienced car owners.

In this article we will not only show exact location of the fuel pump relay on Almera Classic with photos and explanations, but we’ll also figure out how to check it with a multimeter, what symptoms indicate a malfunction, and what to do if the relay “sticks” or overheats. We will pay special attention to the nuances for cars with different types of engines (GA14DE, GA16DE, QG15DE, QG18DE) and years of manufacture (1995–2006).

1. Where to look for the fuel pump relay: exact coordinates

On Nissan Almera Classic The fuel pump relay is located in relay and fuse box, which is under the hood, next to the battery, on the left mudguard. This unit is often called a "black box" because of its appearance. It is important not to confuse it with the interior fuse box (it is located to the left of the steering column).

The specific location of the relay depends on the year of manufacture and configuration:

• 🔧 Models 1995–2000 (B10): the fuel pump relay is installed in the top row of the block, second from right (if you look at the block from the battery side). It is usually signed as FUEL PUMP RELAY or is marked R17.
• 🔧 Models 2000–2006 (N16): relay moved to the bottom row, third from left. A diagram with the designation can be applied to the block cover E15.
• 🔧 Car with HBO: sometimes the relay is duplicated or replaced with a more powerful one. In this case, look for it next to the gas control unit (usually under the hood on the right).

In order not to confuse the fuel pump relay with others (for example, with a fan relay or main relay), rely on the color: it is usually black or dark gray, with markings 12V 30A on the body. For clarity, below is a table with the pinout of the relay block.

Marking on the lid	Purpose	Relay color	Current (A)
R17 / FUEL PUMP	Fuel pump relay	Black	30
E15	Fuel pump relay (N16)	Dark gray	30
R12	Fan relay	Blue	40
R10	Main relay	Red	20

⚠️ Attention: On some modifications Almera Classic (for example, with an engine QG18DE) the fuel pump relay can be hidden under the plastic cover of the block. To gain access, carefully pry it off with a screwdriver without damaging the latch.

2. Signs of a faulty fuel pump relay

The fuel pump relay rarely fails suddenly; it is usually preceded by characteristic symptoms. If you notice at least one of the following symptoms, it is worth checking the relay and the pump power circuit:

• ⚡ Engine won't start, but the starter turns. At the same time, you cannot hear the operation of the fuel pump (there is no characteristic buzzing from the gas tank when you turn on the ignition).
• ⚡ Car Doesn't start on the first try — you have to turn the starter for a long time until it “gets it.” This may indicate sticking relay contacts.
• ⚡ Dips during acceleration or jerking at high speeds. The relay may overheat and turn off, cutting off the fuel supply.
• ⚡ On the dashboard The check engine light comes on (Check Engine). Errors P0190 (fuel pressure sensor circuit malfunction) or P0230 (pump circuit failure) are often related to the relay.

Sometimes the problem lies not in the relay itself, but in its connector or wiring. For example, oxidized contacts can cause the pump to run intermittently. To rule out this possibility, inspect the relay socket for corrosion or poor contact.

If symptoms occur periodically (for example, after rain or in high humidity), the problem may be water getting into the relay block. In this case, it is recommended to process the contacts WD-40 or special lubricant for electrical connections.

3. How to check the fuel pump relay: step-by-step instructions

Checking the fuel pump relay for Nissan Almera Classic does not require special skills - a multimeter or even an ordinary 12 V light bulb is enough. Below is a diagnostic algorithm that will help determine whether the relay is to blame for the malfunction.

Step 1. Checking the voltage at the relay input

Set the multimeter to DC voltage measurement mode (DC 20V). Connect negative probe to a mass (for example, to a car body), and positive - to contact 85 relay (usually a contact marked +12V on the block diagram). Turn on the ignition (do not start the engine!). The voltage should be 12–14 V. If it is not there, the problem is in the power circuit (fuse, broken wire).

Step 2: Checking the control signal

Connect the positive probe of the multimeter to the contact 86 relay (control contact). When you turn on the ignition, voltage should appear here. 12 V for 2–3 seconds (this is the operating time of the main relay). If there is no voltage, it is faulty ECU or a break in the control circuit.

Step 3: Check the output contact

Connect the multimeter probes to the contacts 30 (input) and 87 (output) relay. When voltage is applied to the contact 85 a characteristic sound should be heard clicking, and the resistance between 30 And 87 should fall to 0 ohm (the contacts will close). If this does not happen, the relay is faulty.

For clarity, below is the contact diagram of a standard 4-pin relay:

+12V (85)
│
┌───────┐
│       │
│  ┌─┐  │
│  │ │  │  (86) Управление
│  └─┘  │
│       │
└───────┘
(87) Выход на насос
│
(30) +12V постоянное

⚠️ Attention: If during testing you find that the relay works, but the fuel pump does not turn on, the problem may be pump weight (the wire goes to the body under the rear seat) or in the pump itself. Check the voltage directly at the pump connector (under the rear seat, under the gas filler flap).

4. How to replace the fuel pump relay: nuances and errors

Replacing the relay with Nissan Almera Classic takes no more than 5 minutes, but there are a few things to consider to avoid new problems:

1. Disconnect the negative battery terminal before replacement. This will prevent short circuits when manipulating the relay block.
2. Compare marking of old and new relays. Even if the relays are identical in appearance, they may differ in current (for example, 20A instead of 30A). Using a relay with a lower rating will lead to its rapid failure.
3. Check state of contacts in the socket. If they are oxidized or burnt, clean them with fine sandpaper or special contact fluid.
4. After replacing the relay turn the ignition on/off several timeswithout starting the engine. This will help “bleed” the fuel system and avoid prolonged rotation of the starter when starting for the first time.

If after replacing the relay the fuel pump still does not work, check:

• 🔌 Fuel pump fuse (usually 15A, located next to the relay in the same block).
• 🔌 Fuel filter condition — a clogged filter can create excessive load on the pump, which leads to protection activation.
• 🔌 Fuel rail pressure. For this you will need a pressure gauge. Normal pressure for Almera Classic — 2.5–3.5 bar.

5. Frequently asked questions and myths about the fuel pump relay

There are many myths around the fuel pump relay, especially among owners Nissan Almera Classic. Let's look at the most common ones:

Myth 1: “The fuel pump relay can be replaced with any other relay from the block.”

This is not entirely true. Although most relays in a block have the same shape, they may differ in switching current And response time. For example, a fan relay is designed to 40A, and the fuel pump relay is on 30A. Using a more powerful relay can lead to overheating of the contacts, and a less powerful one can lead to its rapid failure.

Myth 2: “If the fuel pump hums, it means the relay is working.”

The whirring of the pump only indicates that it is voltage is supplied. However, the relay may be partially faulty - for example, the contact may burn out 87, which will lead to a voltage drop and insufficient fuel pressure. As a result, the engine will run intermittently.

Myth 3: “The fuel pump relay only breaks due to old age.”

In practice, the relay most often fails due to:

• 💦 Moisture getting into the relay block (for example, after washing under the hood).
• ⚡ Short circuit in the fuel pump circuit (for example, due to damaged wire insulation).
• 🔥 Overheating of the relay unit (if it is located next to the manifold outlet).

What happens if you drive with a faulty fuel pump relay?

Long-term operation with a “stuck” relay leads to increased load on the fuel pump, its overheating and reduced service life. In the worst case, the pump may fail completely, and replacing it will cost much more than a relay (from 3,000 to 8,000 rubles versus 300–500 rubles for a relay).

6. Alternative diagnostic methods without a multimeter

If you don’t have a multimeter at hand, you can check the fuel pump relay using improvised means:

Method 1: Replace with a known good relay

Take a relay with similar characteristics from another assembly (for example, a fan relay or main relay) and install it in place of the fuel pump relay. If the pump starts working after replacement, the problem is in the relay.

Method 2. Test by ear

When you turn on the ignition, you should hear a click from the relay and a short buzz from the fuel pump (2-3 seconds). If there is no click, the relay does not operate. If there is a click, but you can’t hear the pump, the problem is in the circuit after the relay (wiring, pump, ground).

Method 3. Checking with a control lamp

Take a 12V light bulb with two wires. Connect one wire to the contact 87 relay, the second - to ground. When you turn on the ignition, the light should light up for 2-3 seconds. If this does not happen, the relay or control circuit is faulty.

⚠️ Attention: Do not use the "jumper" method (closing contacts) to test the relay 30 And 87 screwdriver). This may lead to fuse blown or even damage to the ECUif there is a short circuit in the circuit.

7. Where to buy a fuel pump relay for Nissan Almera Classic

The fuel pump relay is not a scarce part, but when purchasing you should pay attention to quality and compatibility. Here are a few proven options:

Place of purchase	Cost (RUB)	Pros	Cons
Official dealer Nissan	800–1 200	Original quality guarantee	Expensive, long wait
Car disassembly	200–500	Low price, you can check before purchasing	Risk of buying a worn relay
Online stores (Exist.ru, Autodoc)	300–600	Wide range, fast delivery	Possible fakes
Auto parts stores (ATS, AutoDetail)	400–700	You can take your old relay with you for comparison.	Prices are higher than on the Internet

When purchasing, pay attention to:

• 🔍 Marking: The original relay has a code 25230-31U00 or 25230-31U01 (for N16). Analogues: TYCO V23134, BOSCH 0 332 019 150.
• 🔍 Country of origin: Give preference to relays made in Japan or Germany. Chinese analogues often last 2–3 times less.
• 🔍 Packaging: the original relay is packed in a branded package Nissan with a hologram.

FAQ: Frequently asked questions about the fuel pump relay

Is it possible to drive with a faulty fuel pump relay?

Technically possible, but highly undesirable. If the relay “sticks” or works intermittently, this leads to:

• Unstable engine operation (jerks, dips).
• Increased load on the fuel pump (it may burn out).
• There is a risk of being left without fuel on the way (if the relay fails completely).

It is recommended to replace the relay at the first sign of trouble.

How to distinguish a fuel pump relay from a fan relay?

They are similar in appearance, but there are key differences:

• The fuel pump relay is usually black, and the fan relay is blue.
• On the cover of the fuel pump relay block it is designated as FUEL PUMP or R17, and the fan - RADIATOR FAN or R12.
• The fan relay is designed for 40A, fuel pump - on 30A.

Why does the fuel pump not work after replacing the relay?

Possible reasons:

• Defective fuse (check 15A in the same block).
• Problems with mass pump (wire under the rear seat).
• Defective the fuel pump itself or its connector.
• Damaged wiring from relay to pump.

Check the voltage at the pump connector (should be 12 V when the ignition is turned on).

Is it possible to repair the fuel pump relay?

Theoretically yes, but in practice it is impractical. Relay is sealed device, and its disassembly will lead to loss of tightness. Even if you manage to clean the contacts, the relay will quickly fail again due to oxidation. Cost of a new relay (300–600 rub.) is incommensurate with the time spent on repairs.

Which fuel pump relay is better - original or analogue?

Original relay (Nissan) will last longer, but also costs more (from 800 rub.). High-quality analogues:

• BOSCH (article 0 332 019 150) is a reliable option, close in quality to the original.
• TYCO (article V23134) - good price/quality ratio.
• ERA (article 550357) - a budget option, but the resource is less.

Avoid cheap Chinese relays without a brand - they often fail at the most inopportune moment.