1998 7.3 powerstroke - high pressure oil resevoir leaks down internally as van sits overnight. What causes this?
High pressure oil resevoir leaks down internally (no visible external leaks) resulting in long crank/hard start. Once started it runs fine/stops and starts fine the rest of the day. LPOP recently replaced. Where is the oil leaking? HPOP? IPR? Anti-drain check valve?