1982 mercedez 240d w123 wont stay on
I have a 1982 240d it sometimes turns on after a lot of cranks but only stays on for a couple of seconds and then shuts off. Previously the car was working perfectly but it had poor compression so I decided to take out the engine and rebuild it. Once it was time to put everything back together and start the engine, the car only turn on twice n shut off right away. I have checked the timing a couple of times and everything seems to be on the right markings, I replaced glow plugs, battery, starter,fuel filters and purged all the fuel lines, I also tried a couple of fluids to purge the fuel system but I get no results. I have also tried starting fluid the car stays on a bit longer but still the same thing. I believe it has to do with not having enough fuel pressure or something related to the fuel supply because timing and compression are good. I have just reached a dead end and i am running out of ideas. If anyone knows how solve this problem any advice will be really helpful.