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1988 944S sunroof gears and fuel pressure check valve

Fuel System

Vehicle Information: Model(924/944/968): 944S; Year: 1988; Body Type: Coupe; Total Mileage: 144000;

I replaced the plastic gears on the sunroof, but with no reference to align them they stripped again. What is the proper installation technique?Also, fuel is not remaining pressurized in the fuel rail resulting in a hard start both warm and cold. The pressure regulator at the end of the fuel rail is new. I pressurized the system and checked for leaky injectors and did not find a leak. Is there a check valve I can install inline without replacing the fuel pump?

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