[unzio]

Hi everyone, I'm looking for a few answers to questions that I have. First, the details: 1976 911S, 2.7, with the classic no start after it warms up (heat soak/vapor lock) problem. I have a fuel pressure gauge tee'd in post fuel accumulator, and the pressure drops almost instantly to 0psi after shut down, probably within 20 seconds. If I close the valve on my gauge set tee, then the pressure holds, which means that everything post-accumulator (injectors, etc) is fine. So, the questions are;

1- After searching on this forum for 2 days, it looks as if the general consesus is either accumulator or fuel pump/check valve. My issue is this; if both the accumulator and the check valve should maintain fuel pressure in the system, then if only one is bad the other should still do the job, correct? Am I missing something? My fuel pump does not have a check valve that is visible from the outside, so I am assuming that it is internal, if it is there at all.

2- If the cause of the problem is vapor lock, then why doesn't the fuel boil when the accumulator and check valve are functioning properly? Is it because the pressure raises the boiling point?

3- The car runs fine otherwise, but my fuel pressure gauge reads 85 psi running. I don't have a manual yet (should be here tomorrow!), but I've read many times that 65-75 psi is the norm. Is this an issue I should be looking into? My fuel pump looks original, although it doesn't look like any of the photos on our host's parts pages. The outlet is not on the end of the pump, it is a hollow bolt/banjo that is threaded into the side/housing of the pump.

Thanking all the experts in advance...