Where is the vacuum line on a 1997 e350 diesel?

There isn't a single "vacuum line" on a 1997 E350 diesel like there might be on a gasoline engine. Diesel engines don't use vacuum in the same way. Instead, they rely on different systems for things that gasoline engines use vacuum for.

However, there are several lines that might be mistaken for vacuum lines, depending on what you're trying to find. To help me pinpoint what you need, tell me:

* What is the purpose of the line you're looking for? (e.g., brake booster, cruise control, EGR valve, etc.) Knowing the function will help determine the location.

* Where are you looking on the engine? (e.g., near the intake manifold, on the firewall, etc.)

Without knowing the purpose, giving a precise location is impossible. The E350 diesel has many pressure lines and hoses related to fuel, air, and emissions control. It's crucial to be precise in your description to avoid accidentally disconnecting something crucial.