![]() In this way, there’s always fuel in the line, primed, so you can start your engine quickly whenever you need to.Īdvice, how-to guides, and car care information featured on and AutoZone Advice & How-To’s are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk. Once the pump has built pressure, it’s intended to hold it by preventing fuel from bleeding back into the tank. Other styles including a rotary vane and gerotor pump are available for select models, but they’re far less common. Generally, pumps can produce more pressure by pushing fluid through the line rather than drawing it up.Ī fuel pump for today’s engines usually uses an impeller-style system that pulls fuel through it, creating positive pressure on the engine side of the pump. The small cylindrical pump is part of a larger assembly that includes a fuel level sensor and a fuel filter screen. Modern cars almost all have the fuel pump inside the fuel tank. Classic cars often use a mechanical fuel pump at the engine that pulls fuel to the front of the car rather than a pump at the back, pushing it forward. ![]() In older vehicles, the fuel pump is mounted along the frame rail, fastened into the fuel line. A fuel pump is a small electric motor that transfers fuel from the tank to the engine. ![]()
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