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1986 944 Turbo Fuel pressure fluctuation

Fuel System

Vehicle Information: Year: 1986; Engine (type, size, modifications): Lindsey Boost Enhancer; Total Mileage: 107k;

I have noticed a pronounced downward fluctuation of the fuel pressure. On a cold start, it begins steady. In a couple of minutes it begins to jump severely, from the upward boundary of spec down close to zero, and very fast.What do you think of this? I have replaced the fuel damper.

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