Todays engine have fuel tanks that vent back into the engine itself rather than to atmosphere.
In earlier day the vent was simply hung out of the fuel tank to equalise pressure.
vehicles today have a closed system that partly absorbs metro; vapour and balances atmospheric pressure through a charcoal canister.
The amount of gases or vapour drawn through the canister is dependant on many things obviously balancing atmospheric pressure with out overichening fuel mixture.
Blocked charcoal canisters and leaky pipes or non operative evap valves are the common failures.
Any issue with the evap can cause issue with engine power and need looking at.
If when you release your fuel cap there is a n intake of air you definately have issues even without a code or light appearing
In earlier day the vent was simply hung out of the fuel tank to equalise pressure.
vehicles today have a closed system that partly absorbs metro; vapour and balances atmospheric pressure through a charcoal canister.
The amount of gases or vapour drawn through the canister is dependant on many things obviously balancing atmospheric pressure with out overichening fuel mixture.
Blocked charcoal canisters and leaky pipes or non operative evap valves are the common failures.
Any issue with the evap can cause issue with engine power and need looking at.
If when you release your fuel cap there is a n intake of air you definately have issues even without a code or light appearing
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