1992 K75S fuel pressure
98Lee, I quoted the wrong book in referring to relieving fuel pressure. It was on page 6.5 (middle of page) of the 1999 Haynes manual that discusses alternative methods of releasing fuel pressure from the rail. It makes sense to me that this would work but, indeed, I still wasn't able to blow air through the return line even with nearly -40 psi of pressure applied to the vacuum line at the throttle body. Because of the significant task of getting to and removing the FPR, I'm actually hoping that someone will convince me that my conclusion re a frozen closed regulator is wrong. Thanks again.