I have a 2007 cruiser that has two Volvo Penta sterndrives. Both are 5.7 liter OSXI engines. When I refuel, if the starboard tank takes 40 gallons, then the port tank will take 60 gallons. This consistently happens even though I’m careful to operate both engines at approximately the same rpm and when refueling always fill each one full. The dealer says that it is common to have unequal fuel usage on duplicate engines. That big a difference seems wrong to me. What do you think? What should be checked if you agree with me?
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By: Grid Michael
February, 2010
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I concur that the 20-gallon disparity isn’t right. Newer engines have many sensors that pass their info to the ECM. The ECM collates that info and changes spark intensity, timing and fuel distribution in order to give you a smooth-operating engine. If one of these sensors has failed, the ECM may be allowing more fuel, “thinking” the engine’s still running cold. I’d suggest you have your dealer hook up his trusty computer to both engines and compare the readouts.