Hi guys as many of you know I did my cam seals and upgraded to alternator on my 470 . My question is I filled the riser /res. with a/f. And left nothing in the over flow tank I took the boat out and the over flow tank has a/f in it now . The next day I open the radiator cap and I was a little low . I think the a/f is in the overflow will it suck it back in to the riser like a car also there is a 13 psi cap is that the right cap thanks for your help guys