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Re: 1999 Regal starting issue
On the L67 supercharged SII 3800 engine initial fuel pressure is critical for proper startup. At fuel pump prime (ignition to ON) you should see around 48-55 psi on the fuel pressure tester gauge connected to the Schrader valve located by the fuel pressure regulator on the front fuel rail. For hard or long startup you could have a defective fuel pressure regulator, leaking fuel injectors, or a bad one way check valve in the fuel pump assembly.
Also, the L67 has a two speed fuel pump. High speed is needed for startup. There is a fuel pump resistor in the circuit which you can bypass but based on your symptoms it doesn't appear to be the issue but you can try it. Let me know if you need a link to the procedure and we have old threads in history.
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