Unequal fuel burn

Descant · 08-12-2015, 05:08 PM

1999, new to me boat has twin Detroit Diesels. I do not have fuel flow indicators, but the starboard engine seems to use more fuel than the port. First time I filled up (fall 2014) the starboard tank took nearly twice as much fuel as the port. Being unused to the boat, I was curious, but did nothing that year. This year I filled up again, 60 gallons starboard, 30 gallons port. Both engines start and run equally, smooth in all respects, top end, easy synch, smooth acceleration, no hesitation. Appropriate top end RPM. smooth at idle, and shifting in and out of gear. We rarely use the generator, so that does not draw down one tank. I am unaware of unwanted fuel in the bilge.

Any diagnostic thoughts?

08-12-2015, 05:08 PM	#1
Descant Senior Member Join Date: Mar 2006 Location: Merrimack and Welch Island Posts: 4,479 Thanks: 1,390 Thanked 1,667 Times in 1,086 Posts	Unequal fuel burn 1999, new to me boat has twin Detroit Diesels. I do not have fuel flow indicators, but the starboard engine seems to use more fuel than the port. First time I filled up (fall 2014) the starboard tank took nearly twice as much fuel as the port. Being unused to the boat, I was curious, but did nothing that year. This year I filled up again, 60 gallons starboard, 30 gallons port. Both engines start and run equally, smooth in all respects, top end, easy synch, smooth acceleration, no hesitation. Appropriate top end RPM. smooth at idle, and shifting in and out of gear. We rarely use the generator, so that does not draw down one tank. I am unaware of unwanted fuel in the bilge. Any diagnostic thoughts?