Quote:
Originally Posted by CHANCE1234
The boat was filled on the trailer which sits pretty level. I was expecting to put in 40 gallons according to my gauge reading 1/8. I was then only able to put in 17 gallons before it came out the vent and burped out the fill twice. The gauge then read 1/2 but all my senses were saying the tank is full. The sender is at the very rear of the tank and the fill at the front. There must be something wrong. Right??? As for my first post, is it more likely I burned 30 gallons over 30 miles or 17 gallons over 30 miles?
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I have an older Merc I-6 on a 20 Seafari. At the cruise speed you mention I am consistently getting 2.5 mpg w an all day fishing load and a full 22 gal bait tank in front of the splash-well- barely 1.5 mph at idle speeds. I would expect you would do 10 to 15% better with a 4 cyl.
Your meter readings are similar to something mine was doing. Is it possible that your fuel meter and sending unit are operating at different ohms? I found someone had put an automotive or euro fuel meter on a marine sender in mine and units were behaving like unfriendly neighbors. One operated at 0-90 Ohms, the other at 33-240 Ohms. My old sending unit had even been tweaked (ineffectively) to accommodate to ohm variance. I swapped it all out for a WEMA reed sending unit and meter and am very happy with the results.
Heres a simple explanation from Autometer:
http://www.autometer.com/tech_faq_an...x?sid=1&qid=36