Fuel pressure regulator
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2003 5 cyl turbo should have a fuel pressure sensor on the end of the fuel rail such as pictured below. If you do have that sensor you have a fuel pump controller or a PEM that controls the speed of the fuel pump. The fuel pump does not run at fuel speed all the time as earlier cars did. If you don't have a fuel pressure sensor - the pressure regulator is built into the fuel pump. Why do you ask? Got a code?
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MntnDewMan
Volvo S60 & V60
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04-03-2024 04:05 PM