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Charcoal Canister, Fuel Pressure Regulator, Purge Valve, P0440

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All about the intricate relationship between these elements of your Volvo: EVAP codes, Charcoal Canister, fuel trim, and three way unit with pressure regulator.

EVAP diagram

Bypass charcoal canister?

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One thought on “Charcoal Canister, Fuel Pressure Regulator, Purge Valve, P0440

  1. have a problem with my volvo 850 turbo import no fuel coming through, car will start sometimes but wont idel, and the air hoses to the turbo have slight bit of oil coming out of joins. what would the problem be and how to fix

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