Anti-siphon placement

[Celestialsailor]

After rebuilding my diesel and not wanting anymore problems with it, I am removing the home-made exhaust elbow/water injection set up and replacing it with a store bought system. Believe it or not, there was no siphon break in the system. The manifold is right at the waterline, so it really needs one. I looked at 2 different sources online. One shows the siphon connected to the outlet of the water pump">raw water pump. Another shows it connected further down the line to just before it is injected into the elbow. Does it matter?

[Pato]

Any where along the pressure side of water pump

[Celestialsailor]

Thanks Pato...That's what I was thinking too...anywhere that it is out of the way, and at least 12" above the waterline. I'm open to anyone else confirming this.

[TeddyDiver]

Originally Posted by Celestialsailor

and at least 12" above the waterline. I'm open to anyone else confirming this.

That's about right, smaller boats less and big ones more, just stay close to centerline.

[Pato]

Don't forget to account for heeled water line

[Celestialsailor]

Yup...I'm adding a 1 1/2" 90 up, then a 1 1/2" 90 out to the water injection elbow which is giving me an extra 5 " higher.