[targa80]

I agree with Tony’s suggestions. I had a hot start problem when I first purchased my car in 1991. You really need a cis fuel gauge kit with many adapters to properly test the system and fault isolate to the failed part. Since you are having a cold and hot start problem. I would ask is your cold start valve functioning. In my case the car would start cold because the cold start valve gives A straight shot of fuel bypassing the fuel pressure regulator. So not having operating Residual fuel pressure didn’t prevent the car from starting. Once the car was shut off and was still hot the operating residual fuel pressure would drop off quickly and without the cold start valve it would just crank and crank forever. I found that I isolated the accumulator and fuel pump and pressure dropped off. Next, I isolated just the fuel pump and pressure still dropped off. I added an external check valve And retested, the residual fuel pressure stayed Solid, All fixed. The previous owner threw parts at the problem and did not fix the issue. Study the cis primer threads on the forum and test methodically. Your only cost should be the cis gauge kit and the replacement of the actual failed part.

Good luck,

Pat