Hi Doug, I own a 48' Uniflite Yachtfish with twin 410 hp. 6-71's. We normally cruise at 1500 rpms and average about 28 gallons per hour total for both engines (about 14 gph per engine). I never found a "sweet spot". Our tanks have to be switched manually. I recommend studying your fuel system very carefully. Not only do you have fuel supply lines, you also have fuel return lines. I tried running just from our port tank once. After a few hours, fuel started spewing out of the starboard tank.vent. Make sure the proper vent valves are open also or you may be drawing from one tank and returning to a different tank as I did. My boat tends to sit heavy, listing about 5 inches, to the port side and I have never found the reason for it. My wife and I got off the boat and I asked her to watch the waterline as I got back on and stood on the starboard side. My 200 lbs. didn't even phase it. The trim tabs will level it out at cruisng speed, 15 to 16 knots. I feel like if I could find the reason for the list, possibly, my fuel usage would be reduced. We've owned and lived on our Uniflite for 4 years now. I love it but my wife wants to move back into a house. Can't have both so our boat is for sale. Good luck with your boat. The longer you own it, the more you will appreciate just how great a Uniflite really is. Jack Smith Galveston, Texas
On Tuesday, March 13, 2012 12:26:00 PM UTC-5, Doug wrote: > I just purchased an '84 46' Uniflite w/ twin 410hp DDA 6-71 diesels. I'm > trying to get a feel for what I might expect with respect to fuel > efficiency. Hence, if anyone with comparable engines could respond with the > following info, I'd be very grateful: > > 1. Your engine's "sweet spot" in terms of engine RPM and related speed. > IOW, at what RPM/speed do you get the best fuel efficiency? > 2. What is your average fuel consumption in gph at this ideal RPM/speed? > 3. If not the same as #1, what RPM/speed do you generally cruise? > 4. What is your fuel efficiency at that RPM/speed? > > For each engine, I'm told this vessel has a 68 gal. tank forward and a 182 > gal tank aft. Do I need to switch between these tanks or is that done > automatically? How? > > Thanks for any and all responses. > > Doug > -- You received this message because you are subscribed to the Google Groups "UnifliteWorld" group. To view this discussion on the web visit https://groups.google.com/d/msg/unifliteworld/-/qKn0Y6EOij0J. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/unifliteworld?hl=en.
