I have just got a SC308 with 96,000 miles. Love the car but……
Engine was dying over about 20% throttle; then it would start but not run - was trailered home last Sunday after breaking down.
Fuel pressure is 25 - 34 psi at ignition “on” falling to 10psi after about 5 - 10 seconds of idle then it stalls and pressure falls to almost zero. Replaced filter under car - pretty clogged up and hard to blow through - checked flow from tank to filter connection - seems good. With new filter engine idles for longer but same symptoms and eventually stalls - opening the throttle causes rapid stall.
Obviously the fuel pump/s. But these were both replaced about 3,000 miles ago following identical symptoms suffered by the previous owner - so either the replacement pumps were poor quality or there is another cause.
One unexpected (to me) symptom is that the tank pressurises - on filler cap removal there is a great rush of escaping vapour. Don’t know if that’s relevant.
Before I replace the pumps again I would be glad of any observations/suggestions.