Nissan Sunny is a legendary car, known for its reliability, but even it is not immune to problems with the fuel system. One of the most common malfunctions is the failure of the fuel pump, which is often associated with problems in the power circuit, namely fuel pump relay. If your Sunny (especially models B13, B14 or B15) suddenly stalls and does not start, while clicks are heard under the hood or the characteristic buzz of the pump is absent - this relay may be the culprit.

In this article you will find exact relay layout diagrams for different generations Sunny, detailed photos indicating the location, as well as instructions on how to check and replace it yourself. We will figure out why the relay fails, what symptoms indicate this, and give advice on diagnostics without special equipment. If you don’t want to waste time and money on a car service, read on.

Where is the fuel pump relay located? Nissan Sunny: models B13, B14, B15

The location of the fuel pump relay depends on the year of manufacture and modification Sunny. In most cases it is in fuse and relay box under the hood or in the cabin. Below are the exact coordinates for each generation.

For Nissan Sunny B13 (1990–1995) The fuel pump relay is located in main fuse box, which is to the right of the steering column under the instrument panel. To gain access, you need to remove the plastic cover of the unit (it is secured with latches). The relay is usually marked as FUEL PUMP RELAY or has the designation R17.

In models B14 (1995–2000) And B15 (2000–2006) relay moved to engine compartment block, which is located next to the battery. You need to look for it in a plastic box with a lid, where the fuses are also located. The fuel pump relay here may be designated as EFI RELAY or FP RELAY.

  • 🔧 B13 (1990–1995): under the instrument panel, to the right of the steering wheel, relay R17.
  • 🚗 B14 (1995–2000): under the hood, next to the battery, in the fuse box.
  • 🔋 B15 (2000–2006): same place, but may be marked as EFI RELAY.
  • ⚠️ On some export versions B15 the relay is duplicated in the cabin unit - check both places!
📊 What kind of Nissan Sunny do you have?
  • B13 (1990–1995)
  • B14 (1995–2000)
  • B15 (2000–2006)
  • Other model

Photo and location diagram of the fuel pump relay

Visually the fuel pump relay is on Nissan Sunny looks like a standard 4 or 5 pin rectangular relay. Below are photographs and diagrams for different generations.

For B13:

Nissan Sunny B13 fuel pump relay in the cabin unit

On the fuse box diagram B13 The fuel pump relay is marked as R17 and is located in the third row on the right. Please note that the fuses are located nearby F17 (15A) And F18 (10A), responsible for the fuel pump circuit.

For B14/B15:

Nissan Sunny B14 fuel pump relay in the engine compartment

In the engine compartment, the fuel pump relay is usually located next to the cooling fan relay (RADIATOR FAN RELAY). A diagram with the designation can be applied to the block cover EFI RELAY or FP RELAY. If there is no marking, look for a relay with the inscription NISSAN and numbers 25230-31U00 or 25230-31U01.

Model Relay location Designation on the diagram Catalog number
B13 (1990–1995) Interior, fuse box to the right of the steering wheel R17 or FUEL PUMP RELAY 25230-31U00
B14 (1995–2000) Under the hood, next to the battery EFI RELAY or FP RELAY 25230-31U01
B15 (2000–2006) Under the hood, the block next to the battery (sometimes duplicated in the cabin) EFI MAIN RELAY 25230-4M000
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If there is no diagram on the block cover, take a photo of the location of the relay before removing it - this will help you avoid confusing them when reinstalling them.

Signs of a faulty fuel pump relay

The fuel pump relay is an electromechanical device that wears out over time. His refusal may manifest itself in different ways, but there is key symptomsindicating exactly this problem:

  • 🚨 Car won't start, but the starter turns - there is no fuel supply.
  • ⚡ When turning the ignition key no characteristic buzzing fuel pump (normally it is heard for 2–3 seconds).
  • 🔄 Engine stalls while driving, then starts only after the relay cools down.
  • 💡 The dashboard may light up CHECK ENGINE, but the error is not always fixed (for example, P0230 - pump circuit malfunction).
  • 🔌 Relay clicks, but the pump does not turn on - a sign of burnt contacts inside the relay.

It is important to distinguish a relay malfunction from a breakdown of the fuel pump itself or the fuse. For example, if the fuse F17 (15A) burnt out, the symptoms will be similar. Therefore, diagnostics always begin with checking the fuses, then testing the relay, and only after that checking the pump.

⚠️ Attention: If the car stalls while driving and does not start, and the fuel pump relay is hot to the touch, this is a sign sticking contacts. In this case, the relay must be replaced, since further operation may lead to a fire in the wiring.

How to check the fuel pump relay Nissan Sunny multimeter

Checking the fuel pump relay does not require special skills - it is enough to have multimeter and know which contacts to call. Below are step-by-step instructions.

Step 1: Remove the relay from the fuse block. Pay attention to the markings of the contacts - they are usually numbered (for example, 85, 86, 87, 30).

Step 2: Ring the relay coil. Connect the multimeter in resistance measurement mode to the contacts 85 And 86. A working winding should show a resistance within 50–120 Ohm. If the device shows a break (OL) or short circuit (0 ohm) - the relay is faulty.

Step 3: Check your contacts. Switch the multimeter to dial mode and connect the probes to the contacts 30 And 87. When the relay is off, the circuit should be open (no signal). Then apply voltage 12V to contacts 85 And 86 (possible from the battery) - a click should be heard, and the circuit between 30 And 87 will close. If this does not happen, the relay must be replaced.

Remove the relay from the block|Ring the winding (85–86 contacts)|Ring the contacts (30–87) in the off state|Apply 12V to 85–86 and check the circuit 30–87|Make sure there is a click when applying voltage-->

If the relay is OK, but the pump does not work, check:

  • 🔌 fuse (usually 15A in the fuel pump circuit).
  • 🔋 Pump connector voltage (must be 12V when the ignition is turned on).
  • 📶 Mass to the body (poor contact can block the pump).

Step-by-step replacement of the fuel pump relay: instructions with photos

If diagnostics show that the relay is faulty, it must be replaced. The procedure is simple and takes no more than 10 minutes. You will need:

  • 🔧 New relay (original number - 25230-31U00 or 25230-31U01).
  • 🔦 Flashlight (for convenience in the cabin unit B13).
  • 🧲 Tweezers (if the relay sits tightly in the socket).

Step 1: Disconnect the negative terminal of the battery to avoid short circuit.

Step 2: Locate the fuse box (under the hood or in the passenger compartment, depending on the model). Remove the unit cover by pressing the latches.

Step 3: Remove the faulty relay. To do this, carefully pry it with tweezers or your fingers, rocking it from side to side. Do not use excessive force - the contacts may bend!

Step 4: Install the new relay into the socket. Make sure that it is seated all the way and that the contacts match.

Step 5: Replace the block cover, connect the battery and check the operation of the fuel pump. When you turn on the ignition, you should hear the pump hum for 2-3 seconds.

Replacing the fuel pump relay Nissan Sunny

⚠️ Attention: If after replacing the relay the fuel pump still does not work, check wiring integrity from relay to pump. Often the problem lies in oxidized contacts or frayed wires under the car (especially in the fuel tank area).
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When replacing a fuel pump relay, always start by checking the fuse and the voltage at the contacts. In 30% of cases the problem lies not in the relay, but in a blown fuse or bad ground.

Frequent mistakes when diagnosing and replacing relays

Even experienced car owners sometimes make mistakes that complicate repairs. Here are the most common of them:

  • 🔍 Confusing the fuel pump relay with the fan relay. They look similar, but have different markings. Always check the diagram on the unit cover!
  • 🔌 Don't check the fuse. Blown fuse F17 gives the same symptoms as a faulty relay.
  • 💡 Ignore weight check. Poor ground contact to the body or fuel tank can block pump operation even with a working relay.
  • 🔋 Apply voltage to the relay without load. When testing a relay with a multimeter, always connect a load (for example, a light bulb 12V) to avoid false positives.
  • 🛠️ Install a non-original relay. Cheap analogues often have unreliable contacts that burn out after 1–2 months.

Another common mistake is incorrect diagnosis by sound. Many car owners rely on relay clicks, but they can also come from other relays in the block (for example, from the ignition relay). Always check the exact relay that controls the fuel pump!

What should I do if, after replacing the relay, the fuel pump works, but the car stalls while driving?

If the fuel pump turns on, but the engine stalls after a few minutes, the problem may lie in:

1. Pump overheating (wear of brushes or bearings).

2. Clogged fuel filter (check the pressure in the rail - it should be at least 2.5–3.0 bar).

3. Malfunctions of the crankshaft position sensor (engine stalls due to loss of signal).

4. Poor contact in the pump connector (oxidation or broken wires).

In this case, a comprehensive diagnosis of the fuel system is required.

FAQ: Frequently asked questions about the fuel pump relay Nissan Sunny

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

No. If the relay does not work, the fuel pump will not pump fuel and the car simply will not start. In rare cases where the relay is stuck and the pump is running continuously, this can lead to pump overheating and its failure, as well as low battery.

Which fuel pump relay is suitable for Nissan Sunny B14?

For B14 the original relay has a number 25230-31U01. Analogues from Bosch (article 0 332 014 156) or Hella (4RA 003 507-331). The main thing is that the relay is 4-pin with winding resistance 80–100 Ohm.

Why doesn't the fuel pump turn on after replacing the relay?

There are several reasons:

  1. Burnt out fuse (check F17 or F18).
  2. No power supply to the relay (check the voltage at the contact 86 when the ignition is turned on).
  3. Faulty wiring from the relay to the pump (test the circuit with a multimeter).
  4. Burnt out fuel pump (check it directly by submitting 12V to contacts).
How to check the fuel pump relay without a multimeter?

Can be used control lamp or dialing:

  1. Remove the relay and find the contacts 85 And 86.
  2. Connect the lamp (12V) to these contacts - if the relay is working properly, when voltage is applied, the lamp will light up and a click will be heard.
  3. Check contact closure 30 And 87 after a click (the lamp should light when connected to them).

You can also temporarily install known good relay (for example, from a fan) and check if the pump starts working.

Where to buy a fuel pump relay for Nissan Sunny?

The original relay can be ordered from official dealers Nissan or in online stores (Exist.ru, Autodoc). Cost - from 300 to 800 rubles. Analogues from Bosch or Hella will cost less (200–400 rubles), but make sure that their parameters match the original.

When purchasing, pay attention to:

  • Number of contacts (usually 4 or 5).
  • Rated voltage (12V).
  • Winding resistance (50–120 Ohm).