Originally Posted by Mark Adamson
I have just purchased my first cat a Lagoon
410 S2. I am perplexed as both fuel tanks
were full on delivery
, but having done some miles now the stb tank is showing 1/4 full but the port tank is still showing full. The dial resets on ignition back to full so think it is working OK, Does anyone know if there is a switch over from tank to tank or do both engines have a dedicated tank and it is probably my fuel gauge that is faulty, I have looked everywhere for some kind of tank switch valve but cannot find? Thanks in advance!
Hey Mark, On my 410 the tanks are independent of each other as all 410 fuel tanks are. Someone could have modified the system but not sure what purpose it would serve unless there was an auxiliary tank involved. In any case, my advice
is to never trust a fuel gauge on any cruising boat
. They are so unreliable as to be useless.
The most effective way to measure how much fuel is left is to figure out what you burn per hour on each engine
. On my 410, and yours should be close to this, at 2800 rpm
burns .6 gallons per hour. Over four years of cruising has proven this to be a reliable number. So we take the 23 gallons one tank holds and divide that by .6 and come up with 38 hours of runtime. Fill up your tanks and after 10 hours or so refill them. Check how much fuel it took to refuel and how many hours you ran, do the math and that should give you your burn rate. Do this several times for more accuracy. When I'm planning our fuel stops I use a .75 GPH burn rate as a safety
factor. If you don't have hour meters, now is the time to add them as the meters in your tachometer either have, or will fail. Hope this helps..