Refueling a car is a seemingly elementary procedure that every driver faces. But even here there are nuances that affect security, savings and engine life. Experienced car owners know that a “full tank” at different gas stations can mean a different amount of fuel, and the wrong choice of pump or fuel can lead to serious problems.

In this article we will look not only step-by-step algorithm refueling, but also answers to questions that often go unanswered: why sometimes fuel “does not go” to the tank, how to avoid overfilling, whether it is worth topping up “to the neck”, and what additives really work. And also - unique data on how the choice of refueling time affects the volume of fuel poured in (spoiler: in the morning you will get 1-2% more liters for the same money).

1. Preparing for refueling: what needs to be done before approaching the pump

Many drivers drive up to a gas station automatically, without thinking about preparation. Meanwhile, the right actions before refueling will save time and nerves.

Firstly, determine the fuel type, which your car requires. This information is indicated:

  • 🔹 On the inside of the gas tank flap (most modern cars)
  • 🔹 In the operating instructions (section "Fuel and lubricants")
  • 🔹 On a sticker next to the glove compartment or on the back of the tank lid

Secondly, check side of the gas tank — this will save you from awkward maneuvers at the gas station. Most Japanese and Korean machines (for example, Toyota Corolla, Hyundai Solaris) hatch on the right, and European (for example, Volkswagen Passat, Renault Duster) - on the left. But there are exceptions: Ford Focus third generation tank on the right, and Kia Rio 2020+ - on the left.

📊 Where is the gas tank flap located on your car?
Left
Right
Rear (like old Jeeps)
I don't know

And finally, prepare a means of payment. Modern gas stations accept:

  • 💳 Bank cards (contactless payment does not work on all dispensers)
  • 💵 Cash (to the cash register or through the bill acceptor at the column)
  • 📱 Mobile payments (Apple Pay, Google Pay, SBP - depends on the gas station network)
  • 🪪 Bonus cards (for example, Lukoil-Club, Gazpromneft-Bonus)
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If you fill up at an unfamiliar gas station, check in advance whether they accept your payment method. Some small chains only accept cash.

2. Choice of fuel: what gasoline or diesel to fill

A mistake in choosing fuel is one of the most costly. Bay 92nd instead of 95th or vice versa, at best you will lose power, at worst you risk damage the fuel system.

Main types of fuel and their features:

Fuel type Octane number (for gasoline) For which engines Features
AI-92 92 Old carburetor and injection engines Cheaper, but can cause detonation in modern engines
AI-95 95 Most modern gasoline cars Optimal price/quality balance
AI-98/100 98/100 Highly boosted and turbocharged engines More expensive, but increases engine life if used correctly
DT (diesel) — Diesel engines Available in summer and winter (freezes at -10°C and -35°C, respectively)
Gas (methane/propane) — Car with HBO 30-50% more economical than gasoline, but requires a separate tank

⚠️ Attention: If your car is designed for AI-95and you flooded AI-92, modern engines with a knock sensor will adjust the ignition timing, but power will drop by 5-10%. If you regularly use low-octane fuel, you risk encountering carbon deposits on valves and problems with the catalyst.

The situation with diesel fuel is even more serious: in winter summer diesel fuel thickens and clogs the fuel filter. If this happens, the only way out is tow the car to a warm box and warm up the tank.

What to do if you filled in the wrong fuel?

If the error is detected immediately at the gas station:

1. DO NOT START the engine.

2. Ask gas station employees to pump out the fuel (paid service, ~1500-3000 rubles).

3. After pumping, flush the fuel system at a service station.

If the car left the gas station and stalled:

1. Call a tow truck (do not try to restart).

2. The service station will carry out a complete flushing of the tank, fuel lines and, possibly, replacement of filters.

The cost of repairs after such an error is from 10,000 to 50,000 rubles. depending on the car model.

3. Step-by-step instructions: how to fill a full tank

Now let's move on to practice. Follow this algorithm to refuel quickly and without errors:

  1. Access to the pump. Stop so that the gas tank flap is opposite the pump. Most gas stations have mirrors to help you navigate. Distance to column - 30-50 cm.
  2. Turn off the engine. This is a safety rule: running engine + gasoline vapor = risk of fire.
  3. Open the tank flap. In most cars, this is done from the passenger compartment (the lever next to the driver's seat, indicated by a gas station icon). In some models (for example, Renault Logan first generation) the hatch opens manually.
  4. Remove the tank cap. On modern cars it is often tied to the hatch with a string; on older cars it can be unscrewed counterclockwise.
  5. Select the dispenser number and fuel type. On the column display or at the checkout, indicate:
    • 🔢 Column number (usually indicated large on the stand)
    • 🛢 Fuel type (AI-95, DT etc.)
    • 💰 Payment method (cash/card)
  • Insert the gun into the tank. All the way, but without effort. There is a lock on the gun - snap it into place so you don't have to hold it with your hand.
  • Start refueling. On prepaid dispensers, pay first, then fill. On postpaid dispensers - fill up first, then pay.
  • Control the process. When the tank is almost full, the filling speed will decrease and then the gun will automatically turn off (triggered check valve).
  • Fill up to the neck. After the first shutdown, you can add more 1-3 liters, gently pressing the pistol lever in short bursts.
  • Close the tank. Screw the cap until it clicks (on some cars, for example, BMW, it only tightens until it stops without a click).
  • Receive a check. It will be needed to guarantee the quality of fuel and accounting (if refueling is for official purposes).

    • ✅ Engine off

    ✅ Parking brake on

    ✅ Fuel filler door is open

    ✅ Tank cover removed

    ✅ The gun is inserted all the way-->

    ⚠️ Attention: If the gun does not lock into the tank and falls out, check:

    • 🔧 Is the gun inserted correctly (sometimes you need to turn it slightly clockwise)
    • 🔧 Is there any damage to the tank neck (dents, rust)
    • 🔧 Is the filter mesh in the gun clogged (relevant for old gas stations)

    4. How much fuel does a “full tank” hold? The difference between the passport and actual volume

    The technical characteristics of the car always indicate nominal tank volume. But in practice, it is possible to fill either more or less. Why is this happening?

    Reasons for the discrepancy:

    • 📉 Reserve Manufacturers indicate the “useful” volume without taking into account 5-10 liters reserve, which remain in the tank after the gas station light comes on.
    • 🌡 Temperature. Gasoline expands when heated. In the morning, when the fuel is cold, it will enter the tank 1-2% more than during the day.
    • 🔄 Tank design. In some cars (for example, Nissan Qashqai) the tank has a complex shape with “pockets” into which fuel is poured unevenly.
    • 🛢 Remaining fuel. If the dashboard lights up 1-2 divisions, there may remain from 5 to 15 liters.

    Example from life: in Toyota RAV4 2020 rated tank volume: 55 l, but after the reserve light comes on, owners on average top up 48-50 l, but it’s possible to fill it “to the neck” 58-60 l. The difference is 5-10 liters — this is precisely the reserve and “dead” volume in the highways.

    💡

    If after refueling the pistol “before shooting” there is less fuel in the tank than expected, do not panic - this is normal. The main thing is that the difference does not exceed 10% of the passport volume.

    5. Typical mistakes when refueling and how to avoid them

    Even experienced drivers sometimes make mistakes at gas stations. Here are the most common:

    1. Fuel overflow. When the gun turns off, many people try to add more by pressing the lever. This leads to:

    • 💦 Gasoline getting on the body (damages paintwork)
    • 🔥 Risk of fire (gasoline vapor + static electricity)
    • 💰 Overpayment (extra 0.5-1 l fuel you paid for)

    2. Wrong choice of column. At some gas stations there are pumps for 92nd and 95th gasoline are located nearby, and the pistols do not differ in appearance. Always check the lettering on the column and the color of the pistol grip (usually 92nd - black, 95th - green, 98th - red, diesel - yellow).

    3. Refueling with the engine running. This is a gross violation of safety regulations. Modern gas stations have sensors that block the fuel supply if the engine is running (relevant for Gazpromneft, Rosneft and other large networks).

    4. Using the phone while refueling. Despite the myths, smartphone cannot cause a spark, but you should not be distracted by calls - this increases the risk of errors.

    5. Ignoring a check. The check is your insurance in case the fuel turns out to be of poor quality. Without it, it will be extremely difficult to prove anything.

    💡

    If, after refueling, the car begins to “triple” or loses power, immediately save the receipt and go to the gas station to take fuel samples. By law they are required to conduct an inspection within 5 working days.

    6. How to save money at gas stations: life hacks and myths

    Fuel prices are rising and drivers are looking for ways to save money. Let's figure out what really works and what is a waste of time.

    Working ways to save:

    • 🕒 Fuel up in the morning. As mentioned earlier, cold fuel is denser, so for the same money you will get 1-2% more liters.
    • 💳 Use cashback and bonus programs. For example, a map Lukoil-Club gives up 5% cashback, and Gazpromneft-Bonus — discount 1 ruble/liter when accumulating points.
    • 📱 Follow the promotions. Applications like Petrol Navigator or Yandex.Refills show prices at gas stations nearby and notify you about discounts.
    • 🚗 Drain the fuel tank before selling your car. If a car is on sale for more than a month, gasoline begins to lose octane number. Merged 10-20 liters can be used for another car.

    Myths that you shouldn’t waste time on:

    • ❌ "Adding additives increases the octane number."Most additives (eg. Octane Plus) have a temporary effect and may damage the sensors.
    • ❌ "Refilling with half a tank is more economical."On the contrary, frequent trips to gas stations waste more time and fuel on the road.
    • ❌ "Gasoline from one gas station is better than from another."All major networks (Lukoil, Gazpromneft, Rosneft) purchase fuel from the same refineries. The only difference is in the additives.

    ⚠️ Attention: If you see a price at a gas station that is significantly lower than the market price (by 3-5 rub/liter cheaper), this is a reason to be wary. Most likely, the fuel is diluted or of poor quality. Check station reviews at Google Maps or 2GIS.

    7. Features of refueling in different situations

    Refueling does not always take place under ideal conditions. Let's look at the nuances for non-standard cases.

    1. Refueling in cold weather (-20°C and below).

    • ❄️ Diesel fuel may begin to thicken already at -15°C. Use winter DT or anti-gel (for example, Liqui Moly Diesel Fliess-Fit).
    • ❄️ Gasoline cars can be refueled without any problems in cold weather, but after refueling, let the car run 1-2 minutes before driving so that the fuel is evenly distributed throughout the system.
    • ❄️ Avoid gas stations with manual dispensers - the metal parts of the gun can freeze and damage the tank neck.

    2. Gas station in another country.

    • 🌍 In Europe and the USA, the octane number is designated differently: our AI-95 corresponds Euro 95 or Regular (in the USA).
    • 🌍 In some countries (e.g. Germany) there are no operators at the gas station - payment is only through the terminal (a card with cashless payment will be useful).
    • 🌍 B Japan and South Korea At gas stations it is customary to refuel with full service (they will even remove the caps from your wheels). Refueling yourself may be perceived as impolite.

    3. Refueling a car with gas equipment (gas equipment).

    • ⛽ Fill up with gasoline first, then gas. This is due to the fact that the fuel pump is cooled by fuel.
    • ⛽ Do not fill the gas “to the neck” - leave it 10-15% free space for expansion.
    • ⛽ After filling the gas, check the tightness of the connections with a soap solution (if you smell gas).

    4. Refueling a motorcycle or scooter.

    • 🏍 Use only low flow dispensers (usually labeled "For motorcycles").
    • 🏍 Do not smoke or use open fire - gasoline vapors accumulate around the motorcycle.
    • 🏍 At some gas stations (Lukoil, Gazpromneft) for motorcycles there are special guns with a smaller diameter.

    8. What to do if after refueling the car behaves strangely

    Sometimes, after visiting a gas station, the car begins to become “stupid,” twitch, or stall. Let's look at possible causes and solutions.

    Symptom 1: The engine stalls or loses power.

    • 🔧 Reason: Low octane fuel or water in gasoline.
    • 🔧 Solution: Drain the fuel and refuel at another gas station. If the problem persists, check the spark plugs.

    Symptom 2: The car stalls at idle.

    • 🔧 Reason: Clogged fuel filter (relevant for diesel cars after refueling with summer diesel fuel in winter).
    • 🔧 Solution: Warm up the tank in a warm box or add anti-gel (Hi-Gear Diesel Antigel).

    Symptom 3: White smoke appears from the exhaust pipe.

    • 🔧 Reason: Water in the fuel (especially if you refueled at an unknown gas station).
    • 🔧 Solution: Use a dehumidifier (Liqui Moly Fuel Protect) or drain the fuel.

    Symptom 4: Check Engine Light comes on.

    • 🔧 Reason: Poor quality fuel or incorrect octane number.
    • 🔧 Solution: Read the error through a scanner (for example, ELM327) and reset it. If the error persists, drain the fuel.

    ⚠️ Attention: If after refueling the car does not start at all, DO NOT try to turn the starter any more. 3-5 seconds in a row. Each launch in such a situation pumps low-quality fuel into the system. It’s better to call a tow truck and take the car for diagnostics.

    💡

    If you suspect that you have filled up with low-quality fuel, keep your receipt and do not wait for your symptoms to worsen. The faster you drain bad gasoline, the less damage will be done to the engine.

    FAQ: Answers to frequently asked questions

    Is it possible to mix gasoline of different brands (for example, 92 and 95)?

    Yes, but it is not advisable to do this regularly. When mixed once AI-92 and AI-95 The tank will contain fuel with an octane number of ~93-94, which is suitable for most modern cars. However, constant use of such a mixture can lead to carbon deposits on the valves.

    Exception: if you top up higher octane gasoline (for example, in the tank 92nd, and you top up 95th), it is safe and even beneficial for the engine.

    Why is there less fuel in the tank after refueling “before shooting” than expected?

    It's okay. Reasons:

    • 🔹 There was a reserve left in the tank (5-10 liters after the light comes on).
    • 🔹 The fuel in the dispenser is colder than in your tank (the volume decreases when heated).
    • 🔹 The gun turns off at the first resistance, and you can add more “to the neck” 1-2 liters.

    If the difference is greater 10% from the tank's nameplate volume, check the column for accuracy (at large gas stations the error does not exceed 0.5%).

    Is it worth refueling at little-known gas stations where fuel is cheaper?

    It's not worth the risk. Cheap fuel can be:

    • 🔹 Diluted (for example, 95th diluted 92nd or kerosene).
    • 🔹 With expired additives (octane number drops after 3-6 months).
    • 🔹 With mechanical impurities (sand, rust from old tanks).

    If you do refuel at a questionable gas station, add a fuel system cleaner to the tank (Liqui Moly Systempflege or Wynn's Injector Cleaner).

    How to refuel correctly if the tank is almost empty?

    If the reserve light is on or flashing:

    1. Go to the gas station immediately - left in the tank 5-10 liters, and the pump may begin to take in air.
    2. Do not turn off the engine until it stops completely - this will increase the load on the starter.
    3. At the gas station, first fill 10-15 liters, then top up until the tank is full. This will prevent the formation of air pockets.
    4. After refueling, let the car sit 1-2 minutes before driving to allow the fuel to settle in the tank.

    ⚠️ If the car stalls due to lack of fuel, DO NOT try to start it immediately after topping it up. Let the pump pump up gasoline (turn the key to position ON for 5-10 seconds without starting the starter).

    Is it possible to refuel with the engine running?

    No, this is a gross violation of safety regulations. Risks:

    • 🔥 A spark from spark plugs or the exhaust system can ignite gasoline vapors.
    • 🚨 At most gas stations, automatic dispenser locking is triggered if the engine is running (sensors record vibration).
    • 💰 Fine for violating the rules at a gas station - up to 2000 rub (according to the Code of Administrative Offenses of the Russian Federation, Article 20.4).

    Exception: diesel cars can be refueled with the engine running in cold weather (to prevent the fuel from thickening), but only if this is permitted by the rules of a particular gas station.