So on the 1985 Mercedes 300d turbo diesel . Its a every day driver. Just pulled into the neighborhood and before i can make it to my house the Mercedes stalls and dies. Tried to crank the engine and it wouldn't start. I just came off a 20 mile run.

Next day i checked the lift pump for diesel, all seemed flowing good. I sprayed a bunch of starting fueled into the air intake and also removed my air filter and it still wouldn't start. I replaced the lift pump thinking maybe it wasn't getting enough fuel pressure and also primed it bunch of times. Still nothing. Check the fuses and everything seems good..

Can it be the CPS fail? How do i test that?

Any ideas what the problem might be?> Very strange. Any help, thanks ahead of time.