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Boat Repair/fuel usage
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Question
Hi Jeff
I have a Johnson 140 about a 1984 model and it seems to use far more fuel than it should or used too.
How do I go about tuning the motor to use optimal fuel. currently a small trip about 10 km will use almost 2x tote tanks (44l)
Les, you got me with the metrics. The 140 was not a very fuel efficient engine, not bad but not good either. It was built when gas was cheap and plentiful.
Your best bet is to make sure the engine is up to par. Good compression and a full tune up. Check your lower unit and prop that they are in good condition as well. Nicks, and bent blades on the prop will hurt fuel economy. You may want to try a stainless steel prop as they preform better at lower rpm.
Check the boat bottom. Make sure it is straight, no growth or rough surfaces, like from badly done repairs. Hook or rocker in the bottom could also hurt the fuel economy.
Check inside the boat. Are you carrying too much weight? Extra equipment or not needed gear can hurt economy.
Hope this helps.
Jeff
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Jeff Grigg
Expertise
Can help with most any question related to outboards, high performance, hull repair, rigging, if it floats and uses a motor. From a 9.9 on a aluminum boat to DFI two strokes. Outboard motors are my specialty. I can help with some I/O questions as well. Ratings are the only way we know if we are helping. If you are pleased with the help, please rate us. 20% don't bother reading my answers! If you are not going to read the follow up then why ask? Keep in mind we do this at no charge and are not paid. We do it to help you!
Experience
32 years in the marine business. Own a service facility, in coastal South Carolina certified Master Tech by Johnson/Evinrude, certified Mercury/Force, Tohatsu/Nissan. Former technical director for DMI Pistons. 30 year racing career including 3 APBA Formula V National Championships
Organizations
AMTECH, APBA
Publications Written For
Boat & Motor Dealer, Car Classics, Custom Vans (tech articles), Miami News, powerboat racing column
Awards and Honors
Certified Master Technician Johnson/Evinrude
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