I have twin 496 MAG fuel injected, mercruisers, 2005 Doral. Notices this year 1 engine burns about 5 or so gph more than the other, at full throttle is at 3700 rpm, but the other engine (burning less fuel) is at 4000 rpm. So, suspect engine burns more fuel (confirmed at fill up - starboard tank at 1/4 full, port tank (good engine) about 1/2 tank full. Both engines run smooth, perfect in all other ways. no stalling, no hesitation, no other issues.
starboard engine at low RPMs seems to burn same fuel rate as port engine, but as you run faster, starboard engine fuel consumption (have fuel flow meter) starts to be as much as 5 gph more at same RPM. Plus, when both throttles pushed to the max, starboard engine tops out at about 3700 rpm at 34 gph, port engine goes to 4000 rpm - maybe 28 gph.
Can anyone suggest what might cause this? Someone mentioned barnacles on props of starboard engine (bravo 3 drives)? Have not hit anything with props, no vibrations, all otherwise is perfect.
thanks for any suggestions.
Roger4
starboard engine at low RPMs seems to burn same fuel rate as port engine, but as you run faster, starboard engine fuel consumption (have fuel flow meter) starts to be as much as 5 gph more at same RPM. Plus, when both throttles pushed to the max, starboard engine tops out at about 3700 rpm at 34 gph, port engine goes to 4000 rpm - maybe 28 gph.
Can anyone suggest what might cause this? Someone mentioned barnacles on props of starboard engine (bravo 3 drives)? Have not hit anything with props, no vibrations, all otherwise is perfect.
thanks for any suggestions.
Roger4
