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Well, I really appreciate all the help, as I said this has me stumped.
This morning I opened the fuel line at the engine ( the car has been sitting two days) there was no pressure and only a dribble of fuel. I opened it before the regulator and there was a fair amount of gas but no pressure. Then I removed the plugs and they all looked dry and not sooty at all. they were a nice light grey .
I had my wife turn the engine with the starter and I watched the plug holes. There was a little vapor but no liquid gas. The car has 166,000 miles so I wouldn't expect the rings to seal gas for too long anyway.
Then I removed the fuel rail and injectors and pressurized it. they held 35-40 PSI with no signs of leaking anywhere. When I did this with the old injectors there was one that I suspected of leaking.
when I replaced the fuel rail I left the line a little loose and there was gas almost immediately. I have been hesitant to actually test the fuel pressure because I don't know how to attach a gauge. I think there's a Volvo adapter for this but I haven't found a source for one. I don't know what thread is used and don't know how to go about making up some adapter for a gauge. I'm a little afraid of starting fire.
I know there are two temp sensors and I did replace one of them a few years ago, the rear one. I'm not sure which one the computer uses and I don't really remember why I replaced it but this problem hasn't been going on that long.
I can't seem to condemn the fuel system and I'm wondering if there is some problem with the computer in the cold start circuit. I tried finding tests in the manuals (I have Haines and Bently). Bently gives some tests but they reference numbered terminals in the computer plug and I can't find a reliable diagram of which wires are numbered.
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