Dave,
My C-30 had an anti-siphon valve halfway between the muffler & the thru-hull. As a kid I remember hearing it tick but for the last 20 years or so, it has been broken. After some research, I am removing it and adding in a 45 degree fiberglass elbow, since I already have a break in my exhaust hose in that location (came in two 10 foot sections), and need at least a coupler there.
That might avoid the back-up, if your loop is high enough to avoid siphoning in the first place. Apparently it was included in earlier C-30's, but not included in later ones. Since this one's been broken for so long (the flap was laying in the fitting), it obviously hasn't been doing anything for years. The only time (twice) this motor had seawater in it was from overcranking.
My C-30 had an anti-siphon valve halfway between the muffler & the thru-hull. As a kid I remember hearing it tick but for the last 20 years or so, it has been broken. After some research, I am removing it and adding in a 45 degree fiberglass elbow, since I already have a break in my exhaust hose in that location (came in two 10 foot sections), and need at least a coupler there.
That might avoid the back-up, if your loop is high enough to avoid siphoning in the first place. Apparently it was included in earlier C-30's, but not included in later ones. Since this one's been broken for so long (the flap was laying in the fitting), it obviously hasn't been doing anything for years. The only time (twice) this motor had seawater in it was from overcranking.
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