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What is the reason for frequent nozzle tripping when refueling a Volvo?

2 Answers

DeIris

08/30/25 6:24am

Volvo cars frequently experience nozzle tripping during refueling due to a clogged carbon canister in the vehicle. It is necessary to visit a repair shop to have a technician inspect the condition of the vehicle's carbon canister. The fuel nozzle has an automatic shut-off mechanism that operates based on pressure. When the internal pressure in the fuel tank becomes too high, it triggers the shut-off mechanism, causing the nozzle to trip. The carbon canister functions by using activated charcoal to adsorb fuel vapors, achieving the effect of recycling and reuse. It also prevents fuel vapors from being directly released into the external air and helps alleviate internal pressure in the fuel tank. A clogged carbon canister can cause excessive internal pressure in the fuel tank during refueling, leading to premature nozzle tripping. The owner needs to clean the carbon canister to resolve the nozzle tripping issue. For the vehicle's carbon canister, most car maintenance manuals do not specify a clear replacement cycle. Owners can perform maintenance or replacement based on the specific condition of the carbon canister. Typically, it can be replaced at a 4S shop every 40,000 to 60,000 kilometers. If the owner encounters frequent nozzle tripping issues during refueling, they should have the carbon canister repaired.

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VonOwen

09/12/25 3:26am

My Volvo keeps triggering the fuel pump nozzle to shut off during refueling, which is really annoying. I think there could be several reasons for this. The gas inside the fuel tank can't vent properly, causing the nozzle to mistakenly think the tank is full and shut off. Volvo's vent lines sometimes get clogged with dust, especially if you drive frequently in dusty areas. Additionally, if the fuel nozzle isn't inserted deeply enough or is at too much of an angle, poor airflow can trigger the shutoff. I've tried switching gas stations and found that fueling more slowly helps a lot. It's also a good idea to check the charcoal canister—the part that recaptures fuel vapors—as a faulty one can cause issues. In short, this problem affects refueling efficiency, so it's best to have a technician test the ventilation system during regular maintenance to prevent any safety hazards.

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