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What causes my rear wheeled drive Volvo to sometimes run rough in hot weather?

April 26, 2017causes drive hot rear rough run Volvo weather wheeled

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What causes my rear wheeled drive Volvo to sometimes run rough in hot weather?

1 Answer

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Earlier Volvos could run rough if fuel vapors built-up in the fuel line from the tank to the engine during hot weather. A pre-pump inside the tank prevents this. So, if your Volvo has this symptom, a check of both the pre-pump and the fuel pump are indicated.