Fuel pump duty cycle is 100% at start. Drop to 33% after like one min later, so fp will drop 6psi accordingly, but not to zero psi! Maybe u have a faulty sensor, or u mount the sensor on the supply line (should be on the return side)?
using the Perth-WRX mobile app
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MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR
Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport
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