I bought this 1985 Volvo DL 245 station wagon and the only way I can get it to run is to spray starting fluid in the throttle body. I have changed both fuel pumps and even put a fuel pressure gauge on the fuel rail. It showed 40 lbs. and then I squeezed the return line and it showed 100 lbs. pressure. Next I bought a fuel pressure regulator and installed it. It then only showed 30 lbs. pressure. I even tried starting it with the return line squeezed off and it still would not start. I think it has do do with the fuel injectors not firing, but I don't know how to fix that. Any help would be appreciated.