I have a vexing problem.
We are experiencing high fuel
burn. We usually burn about .4 gallons an hour but yesterday we burned about 1.1 gallons an hour! We ran at our normal cruising speed and used our normal RPM
range. We had adverse current
of about 1 to 1.5 knots for about 3 hours during an 11 hour day. The rest was going with the current
or in slack.
We recently had a new bottom put on and the prop just had propspeed applied. Also, we calibrated our fuel tank
by sucking down the fuel
to the point the pickup stopped sucking in fuel then calibrated the tank by pouring in 5 gallons at a time - we have a Hart Tank Tender
. We really don't make any smoke at all - maybe just a puff of white smoke at startup but she seems to be burning very clean.
Here are the things I have looked at:
1) My initial assumption was we have a crack in the tank - Upon inspection
of the bilge
there is no evidence of a crack. The bilge
under the tank is dry, there is no diesel
smell, and our oil
bilge pads (which sit in the only place where the diesel
could go) has no evidence of diesel smell either.
2) Leaking past rings - we just had our oil
inspected by Blackstone before leaving. There is no evidence of combustibles or coolant
in the oil.
I'm out of ideas? Maybe fouled injectors? Bad timing of the valves?