I purchased a diesel water injection system. The system runs on boost pressure/intake pressure to spray a fine mist of water into the intake. But on my 2005 E320 CDI there is no vacuum hook ups.

Am I suppose to drill a hole in the intake and tap it to hook up the vacuum switch And if I did that what happens to the vacuum when the water is misting in.

My other problems are I mounted it in the trunk and I do not have enough 250 psi hose that came with the kit to make it to the trunk.

I don't understand the vacuum question... Usually a water injection kit has a pressure switch that will turn on the water pump at a certain amount of boost. So you need a spot for the pressure switch and a spot for the spray nozzle. Especially if it's specifically for a diesel then there shouldn't be anything related to vacuum.

Shouldn't be hard to find a longer water line. Just find the same type of tubing rated for the same pressure. Does the tank not fit in the engine compartment?

-Rog

I think it may be a question of semantics. Many people refer to any port on the intake system as a "vacuum" line, port or fitting. Also, many people don't realize there's never any vacuum in a diesel intake manifold. (with few exceptions).

In the case of this engine, I would locate the MAP sensor and "T" into it's line.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

Just make sure that the MAP sensor vacuum/boost line isn't too long - I found that when I added in a boost gauge onto this line and making the line much longer meant that it lagged a bit - might be different on the CDI engine though.

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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free!