Nissan Almera Classic (also known as Nissan Sunny B15 in some markets) is one of the most popular sedans in the budget segment, but even such time-tested models have weaknesses. The neck of the gas tank is a seemingly simple element, but its malfunctions can cause a lot of trouble: from difficult refueling to fuel leaks or activation of an error. P0455 (gasoline vapor leak). In this article we will analyze the structure of the neck, typical problems, methods of diagnosis and repair, and also give practical advice on care.

Feature Almera Classic — the location of the gas tank under the rear seat, which affects the design of the neck and access to it. Owners often encounter corrosion of metal elements, wear of seals, or mechanical damage to the hatch. However, the official documentation Nissan pays minimal attention to this unit, leaving car owners alone with their problems. We have collected all the necessary information, including step-by-step instructions, photographs of key points and recommendations for choosing spare parts.

The device of the gas tank neck on Nissan Almera Classic

Fuel filler neck Almera Classic (body B15, 2006–2012) consists of several key elements:

  • 🔧 External hatch — a plastic or metal cover with a lock (on some versions), attached to the body with hinges or latches.
  • 🔄 Neck tube - a metal or plastic pipe connecting the hatch to the gas tank. Passes inside filling hose and, often, the vapor recovery system pipe (EVAP).
  • 🛢️ Back pressure valve — prevents fuel from leaking when the tank overturns or overflows.
  • 🔒 Hatch drive cable — on mechanical versions, connects the lever in the cabin (next to the driver’s seat) with the hatch lock.

On Almera Classic with engines QG15DE (1.5 l) and QG18DE (1.8 L) neck design is identical, except for the length of the tube - it is shorter on versions with a short wheelbase. Important: on models after 2010 Nissan started installing plastic necks instead of metal ones, which affected the reliability of the unit.

Particular attention should be paid to the system EVAP (catching gasoline vapors), which is integrated into the neck. Its malfunctions are often disguised as problems with the neck itself, but require separate diagnostics. For example, clogged carbon filter or a cracked hose may cause the error P0441 (wrong flow in the system EVAP).

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If a hissing sound is heard when you open the gas tank flap, this is a sign of depressurization of the system EVAP. Check the integrity of the hoses and the valve on the tank cap.

Typical fuel filler malfunctions

According to statistics from service centers, owners Almera Classic Most often they encounter the following problems:

Malfunction Reason Symptoms
Metal neck corrosion Exposure to moisture, salt, condensation Rust on the hatch, difficult to open, fuel leak
Wear of the sealing rubber of the hatch Natural wear and tear, temperature changes Extraneous sounds when moving, dust getting into the tank
Broken hatch drive cable Mechanical damage, cable corrosion The sunroof does not open from the passenger compartment, manual opening is required
Cracks in the plastic neck Shock, temperature changes, low-quality plastic Visible cracks, smell of gasoline in the trunk
Tube clogged EVAP Accumulation of dirt, condensation Error P0455, difficult refueling

Critical Feature Almera Classic: on models before 2009, the metal necks did not have an anti-corrosion coating on the inside, which accelerated their destruction by 2-3 times compared to later versions. If your car was released before 2010, check the condition of the neck every 50,000 km.

Another common problem is condensate freezing in the neck tube in winter. This leads to the fact that gasoline “bounces” back when refueling, creating the illusion of a full tank. The solution is to warm up the neck with a hairdryer (not an open flame!) or use special fuel additives.

📊 What gas tank filler problem have you encountered?
  • Corrosion
  • Broken cable
  • Cracks in plastic
  • EVAP clogged
  • Other
  • There were no problems

How to diagnose a malfunctioning neck

Checking the condition of the gas tank neck for Almera Classic can be carried out independently, without resorting to the help of a service station. Start with a visual inspection:

  1. Open the fuel filler flap and inspect it for rust, cracks, or deformation. Pay attention to the hinges - they often break due to corrosion.
  2. Check the rubber seal around the perimeter of the hatch. It should be elastic, without tears. If the rubber becomes dull or crumbles, it needs to be replaced.
  3. Look into the neck with a flashlight. Look for signs of rust inside the metal tube or cracks in the plastic tube. Pay special attention to the junction of the neck and the gas tank - dirt often accumulates there.
  4. Check the cable operation (if the hatch opens from the passenger compartment). Press the lever under the driver's seat - the movement should be smooth, without jamming.

For system diagnostics EVAP you will need a scanner OBD-II. Connect it to the connector (located under the steering wheel, to the left of the pedals) and check for errors P0440–P0456. If there are errors, but the neck is visually intact, the problem may lie in:

  • 🔌 Canister purge valve (often gets stuck in open/closed position).
  • 🔄 Tubing system EVAP — check them for leaks, especially at the joints.
  • 🛢️ Gas tank cap — its O-ring loses its elasticity over time.
How to check the leaks of the EVAP system without a scanner?

Open the gas tank cap and listen: if you hear a hissing sound (discharge), the system is sealed. If there is no sound, there is a leak. You can also remove the hose from the adsorber valve and blow into it: air should not flow freely.

If, when refueling, gasoline “spits” back and the tank is not full, the problem may be check valve neck. To check it, remove the neck (instructions in the next section) and blow it with compressed air. If air flows freely in both directions, the valve is faulty.

Step-by-step instructions for replacing the gas tank filler neck

Replacing the neck with Nissan Almera Classic - a task of medium complexity. Depending on the type of malfunction, you can replace individual elements (hatch, cable, seal) or the entire neck. For a complete replacement you will need:

  • 🔧 Set of sockets and keys (10, 12, 14 mm).
  • 🔨 Screwdriver with flat and cross-shaped tip.
  • 🛠️ New neck (article for metal: 17201-4M000, for plastic: 17201-4M010).
  • 🧴 Sealant for the fuel system (for example, Loctite 577).
  • 🧤 Gloves and rags (gasoline is aggressive to the skin!).

Let's start replacing:

  1. Remove the back seat. It is attached with two latches on the front - pull it up. Under the seat you will find the gas tank hatch (fastened with 4 10 mm bolts).
  2. Disconnect the negative battery terminal - this is mandatory for safety.
  3. Remove the fuel filler flap:
    • If the hatch is hinged, unscrew the fastening bolts (2 pcs. x 10 mm).
    • If it has latches, pry it off with a screwdriver (be careful not to break the plastic!).
  • Disconnect the drive cable (if there is one). To do this, remove the retaining ring from the hatch lever.
  • Unscrew the neck from the body. It is secured with 3-4 12mm bolts. First disconnect the hoses (mark their location with a photo on your phone!).
  • Remove the old neck and install a new one, after lubricating the O-ring with sealant.
  • Reassemble everything in reverse order. After installation, check for leaks by pouring some gasoline and watching for leaks.

    • Take a photograph of the location of the hoses|Disconnect the battery|Prepare a new neck and seals|Check that all tools are present|Ensure ventilation (working with gasoline!)

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    Important: on Almera Classic with a plastic neck, do not use metal clamps when replacing - they can damage the plastic. Use original plastic clips (17225-4M000).

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    If the neck is so rusty that the bolts cannot be unscrewed, do not try to cut them off with a grinder! This may damage the gas tank. It is better to treat the bolts with WD-40 and let them sit for 1-2 hours.

    Cleaning and anti-corrosion treatment of the neck

    If the neck does not yet require replacement, but the first signs of corrosion have appeared on it, you can extend its service life by cleaning and treating. For this you will need:

    • 🧽 Rust remover (WD-40, Liquid Key or Neomid 570).
    • 🖌️ Metal brush or sandpaper (grit 120-240).
    • 🎨 Anti-corrosion primer (for example, Body 930).
    • 🛡️ Mastic for protecting the bottom (Dinitrol or Tectyl).

    Step by step process:

    1. Remove the neck (as described in the previous section), but do not disconnect it from the gas tank.
    2. Clean the surface remove dirt and oil using a degreaser.
    3. Remove rust:
      • For small spots, use sandpaper.
      • For severe corrosion, apply rust converter for 20-30 minutes, then brush off.
  • Apply primer in 2 layers, allowing each to dry for 15–20 minutes.
  • Cover with mastic the outer side of the neck and attachment points. Avoid getting mastic inside the tube!
  • Reinstall the neck and check for leaks.

    • To protect against future corrosion, we recommend:

    • 🚗 Regularly wash the neck and hatch to remove dirt (especially in winter).
    • 🔧 Once a year, treat the hinges of the hatch with grease (LIQUI MOLY LM47).
    • ❄️ Avoid refueling "under the throat" in the cold - condensation accelerates corrosion.
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    If the neck begins to rust from the inside, and it is not yet possible to replace it, temporarily protect the metal by pouring 100–150 ml of oil for two-stroke engines inside (for example, Motul 710). It will create a protective film.

    Common repair mistakes and how to avoid them

    Even experienced car owners make mistakes when working with the gas tank neck. Here are the most common ones and how to prevent them:

    ⚠️ Attention: Never use silicone based sealant to seal the neck! Gasoline will corrode the silicone, which will lead to leaks. Use only specialized sealants for fuel systems.
    Error Consequences How to avoid
    Using non-original seals Leaks, smell of gasoline in the cabin Buy seals with the article number 17226-4M000
    Tightening the mounting bolts Cracks in the plastic neck Tighten to 8–10 Nm
    Ignoring system check EVAP Constant tanning Check Engine After replacing the neck, reset the errors using the scanner
    Operation without disconnecting the battery Short circuit, fire Always remove the negative terminal!

    Another common mistake is Incorrect installation of the hatch drive cable. If the cable is twisted or too tight, the hatch will open with difficulty or close spontaneously. To avoid this, before fixing the cable, check its movement: it should move smoothly, without jamming, and the hatch should open 90°.

    When replacing a metal neck with a plastic one (or vice versa), keep in mind that:

    • 🔧 The plastic neck is lighter, but less resistant to mechanical damage.
    • 🛢️ The metal neck is more durable, but requires regular anti-corrosion treatment.
    • 🔄 On some versions Almera Classic The plastic neck may not fit the fasteners - check compatibility using the VIN code.

    Selection of spare parts: original vs analogues

    When replacing the fuel filler neck with Nissan Almera Classic The owner is faced with a choice: buy an original part or an analogue. Let's look at the pros and cons of each option.

    Original spare parts (Nissan):

    • ✅ Guaranteed compatibility and quality.
    • ✅ Long service life (especially for metal necks).
    • ❌ High price (from 3,500 to 6,000 rubles for a complete set).
    • ❌ Long wait for delivery (if you order from an official dealer).

    Article numbers of original parts:

    • 🔧 Metal neck: 17201-4M000.
    • 🔄 Plastic neck: 17201-4M010.
    • 🔒 Hatch with lock: 62501-4M000.
    • 🛠️ O-ring: 17226-4M000.

    Analogues (manufacturers: Febi, Meyle, Sasic):

    • ✅ The price is 30-50% lower than the original.
    • ✅ Wide range in stores.
    • ❌ The quality of plastic may be worse (especially for budget brands).
    • ❌ There may be problems with the fit (for example, the hatch may not close tightly).

    Recommended analogues:

    • 🔧 Neck Febi (article 27386) - the best price/quality ratio.
    • 🔄 Hatch Meyle (article 100 625 0001) - durable plastic, good fit.
    • 🛢️ Seal Corteco (article 23010010) - elastic, durable.

    When purchasing analogues, be sure to check:

    1. Compatibility by vehicle VIN code.
    2. Material (metal/plastic) - it must match the original.
    3. Complete set (sometimes the kit does not include seals or fasteners).
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    If you buy a plastic neck, pay attention to the thickness of the walls - with cheap analogues it is often thinner than 2 mm, which leads to cracks in frost.

    FAQ: Frequently asked questions about the gas filler neck Nissan Almera Classic

    Is it possible to drive with a rusty gas tank filler neck?

    Short term - yes, but it is dangerous. Rust weakens the metal, which can lead to cracks and fuel leaks. In addition, rust particles can enter the gas tank, clogging the fuel filter. Cleaning and treatment is recommended at the first sign of corrosion, and replacement if severe damage occurs.

    Why does gasoline “spit out” back when refueling?

    This problem is typical for Almera Classic and is related to:

    1. Clogged tube EVAP (needs cleaning or replacement).
    2. Faulty check valve in the neck (neck replacement required).
    3. Overfilling the tank (do not fill it too low, especially in hot weather).

    To fix the problem, remove the neck and blow it with compressed air. If the problem persists, check the system EVAP.

    How to open the gas tank flap if the cable breaks?

    If the hatch drive cable is broken, you can open it manually:

    1. Remove the trunk trim from the hatch side.
    2. Find the lock mechanism (it is attached to the body with 2-3 bolts).
    3. Using your hand or a screwdriver, press the lock lever while simultaneously pulling the hatch towards you.

    After this, replace the cable (part number: 62511-4M000) or the entire lock mechanism.

    What to do if the neck is frozen in winter?

    If condensation is frozen in the neck and gasoline does not flow through:

    • 🔥 Gently warm the neck with a construction hairdryer (do not use open fire!).
    • 💧 Pour 100–200 ml of alcohol or a special anti-gel additive into the tank (LIQUI MOLY Fuel Protect).
    • ❄️ In the future, avoid refueling "under the throat" in the cold and use a gas tank cap with a seal.
    Is it possible to install a neck from another model? Nissan?

    Theoretically it is possible, but only if:

    • The model has the same platform (Nissan B).
    • The fasteners and tube diameter match.
    • System EVAP identical.

    For example, the neck from Nissan Sunny B15 (European version) will do, but from Nissan Almera N16 - no. It is better not to experiment and take the part with the original article number.