What Causes Abnormal Noise in the Car Fuel Tank?

[SanAutumn]

Abnormal noise in the car fuel tank may be the sound of the fuel pump working. If the noise is not the current sound of the fuel pump motor, it could indicate an abnormal fuel pump that needs replacement. Symptoms of an abnormal fuel pump include: 1. Weak vehicle acceleration, especially with noticeable hesitation during rapid acceleration. 2. Difficulty starting the vehicle, including failure to ignite or hard starting. 3. The engine fault light on the vehicle's instrument cluster remains constantly illuminated. Additional Information: As the most fundamental component in the engine fuel supply system, the fuel pump is responsible for drawing fuel from the tank during engine operation and delivering it continuously through the fuel supply line to the engine at a certain pressure. The high-pressure fuel pump then performs secondary pressurization, supplying a measured amount of fuel to each cylinder according to the engine's working sequence.

[MacElaina]

That day on the way to the suburbs, I noticed a buzzing sound under the fuel tank, like an electric razor, that lasted the whole trip. I took it to my trusted repair shop, and the mechanic directly lifted the rear seat to check the fuel pump location, saying it was most likely due to an aging fuel pump. He mentioned that the part works submerged in gasoline, and over time, bearing wear can cause strange noises, making it difficult to accelerate when severe. Another time, after filling the tank too full, I heard a sloshing sound when turning, and the mechanic said it was due to a loose anti-sloshing baffle. Now, I only fill up until the pump clicks off to avoid the tank sounding like a water fight. If you hear a metallic clicking sound near the fuel tank, it might be the exhaust pipe expanding and contracting with heat, pressing against the tank.

[DelFinn]

My old car has been making a gurgling sound after refueling recently. At first, I thought it was an uncleared soda bottle. A car-savvy friend told me there's an anti-slosh baffle in the fuel tank - if it comes loose from welding, sloshing gasoline can cause this noise. Last week during a family road trip, the tank suddenly started hissing like it was sucking air when climbing hills, scaring me into immediate inspection. Turned out the charcoal canister was clogged, creating negative pressure in the tank. The mechanic said fuel tanks often go 'thump-thump' in summer - like someone knocking from inside - when heated fuel vapors expand and hit the walls. Oh, and if you hear clanking on bumpy roads, check if the tank mounting brackets are loose.

[AlexanderMarie]

Fuel tank noises require careful diagnosis by sound. A buzzing motor sound often indicates the fuel pump is nearing retirement, especially noticeable during cold starts. If there's excessive sloshing of gasoline, it's either due to overfilling or a detached anti-sloshing baffle. Hissing sounds near the fuel filler neck warrant checking for a clogged charcoal canister. My colleague's car used to make thumping noises over speed bumps, which turned out to be a stuck fuel level sensor float bouncing around. Once during repairs, I even encountered a fuel tank deformed by exhaust pipe heat, producing weird tearing sounds when the engine was hot.

[LaLincoln]

Last time I noticed a drum-like thumping sound from the fuel tank, and the outer wall felt scalding to the touch. The auto repair shop said it was due to fuel vapor expansion impacting the tank after sun exposure, advising me not to fill up during high temperatures. If you hear a suction sound like drinking bubble tea when refueling, it's most likely a clogged charcoal canister needing replacement. The scariest is the fuel pump's high-pitched screech, resembling nails on a chalkboard, indicating the bearings are nearly seized. There's also the clanking sound of loose fuel tank mounting ears, especially noticeable on bumpy roads, which can wear through fuel lines if not secured promptly.