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Just wondering how much pressure my stock fuel system can handle. I have a Walbro 255lph pump, new filters, and a Sard fuel regulator, and stock injectors on my RB20DET. I know stock is between 45-55psi, but I want to know how high I can boost the pressure.

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https://www.sau.com.au/forums/topic/200739-fuel-pressure/
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Why do you want to raise the pressure? All that will do is force the engine to run richer.

Exactly, my car is a little lean and I just wanted to richen it up a little. Can't afford re tune or new ecu ATM so I need a temporary fix to keep my internals safe.

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https://www.sau.com.au/forums/topic/200739-fuel-pressure/#findComment-3571633
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