The engine starts right up every time, even if there's no pressure in the fuel line (just takes a couple more cranks). Delivery and spark seem solid. I'm about 800 ft above sea level.

And I know the bently says that pressure should be a little lower than spec when the engine is running. Does "a little lower" mean 5 psi? I'm sure the vacuum isn't as strong as a new engine, but I don't follow your calculation. Are you saying the operating pressure should be even lower? Like 43psi?

I'm not concerned about the system pressure when it's running as much as I'm concerned about the pressure dissipating rapidly when it's not running. Please correct me if I'm wrong, but my understanding is that with everything off, the system should stay pressurized for a long ass time. Within a half hour, mine'll drop 15 psi. The seems too fast. Right?


Quote Originally Posted by whiskychaser View Post
3.5 bar is 51 psi. You have 52 with the vac hose off which means its just about bang on. With the engine running you are getting 45psi with it on. You knock off about half a psi of fuel pressure for every inch of HG vacuum the engine creates assuming you are at sea level. Ostensibly you have got about 14 in HG inlet vacuum. Thats a bit low. So maybe a worn engine or you just live up a big hill? Either way I dont recall you saying it wouldnt start?