How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Larry B. Your Own Question

Larry B.
Larry B., Marine Mechanic
Category: Boat
Satisfied Customers: 574
Experience:  Mercury/Mercruiser Certified/Verado/DTS / Yamaha Two and Fourstroke Certified 27 years experience
10582127
Type Your Boat Question Here...
Larry B. is online now
A new question is answered every 9 seconds

I have a 1997 50 hp johnson 3 cyl. oil injected. I ran ...

Resolved Question:

I have a 1997 50 hp johnson 3 cyl. oil injected. I ran out of gas a few days ago. A neighbor brought a tank of premixed gas out and I was able get back home. I ran the motor on double oil all the way in. Prior to running out of gas the motor was running very well. I filled the tank as I normally would with straight gas. Today I went out on the lake and could only get about 4000 rpm''s out of the motor, which will normaly run about 4900- 5100 rpm''s. It was also surging slighty. I''ve replaced the plugs, and installed a new fuel filter which only gave me a couple hundred rpm''s, and I still have the surging. I also tried pushing the electronic choke, and the rpm''s shot up word to 5000 rpm.s momentarily. HELP!!!!!!
Submitted: 6 years ago.
Category: Boat
Expert:  Larry B. replied 6 years ago.
Smitty, when you run this motor out of fuel, it is still pumping the same amout of oil and less gas until it runs completely out of gas and can fill the float bowl with straight oil. The oil is heavyer than the gas and can set in the bottom of the bowl and not mix with the incoming gas vey well and it will not go away very fast. I would try removing the air box from the front of the carbs, take out the drain plugs on the front of the float bowls and let them drain, then flush them out with a little fresh gas.
Larry B., Marine Mechanic
Category: Boat
Satisfied Customers: 574
Experience: Mercury/Mercruiser Certified/Verado/DTS / Yamaha Two and Fourstroke Certified 27 years experience
Larry B. and other Boat Specialists are ready to help you
Customer: replied 6 years ago.
Reply to Larry B.'s Post: Hi Larry: Thanks for your responce. My only, is how do I flush the bowls?
Expert:  Larry B. replied 6 years ago.
Lay something to absorb gas in the bottom of the cowling and with one drain plug removed at a time gently squeeze the primer bulb, will only take a little. do it outside, No smoking/or other ignition sources should be present, wear rubber gloves and safety glasses if you have them, and dispose of the gas or gas soaked rags properly. Never dispose of grease rags or gas soaked rags in the trash, put them in a metal can outside and allow it to evaporate.
Customer: replied 6 years ago.
Sounds logical....I'll give it at ry tomorrow morning (it's getting late now) and hope for the best.   Thanks so much for your help. Kip Smith (Customer)
Expert:  Larry B. replied 6 years ago.
O.K. If it works out for you please click accept if not then come back to this guestion, and we'll kick it around some more.
Customer: replied 6 years ago.
Larry---I'm back. I thought before I tried your suggestion, because it is going to cause me to pull the boat out of the water to work on it, I ran a 5gal. tank of gas through the system to see if it might flush the carbs free of oil. Afer about an hour of running time it still is surging and only reaching 4000 rpms with no significant difference. If you think your solution is still the way to go please respond to this reply as I intend to pull the boat in the morning and work on it. If you have other ideas please come forward with them now.    Thanks XXXXX (Customer)
Expert:  Larry B. replied 6 years ago.
Well if you are going to pull it out any way I would try it, if you ran the motor at high rpm's with the other tank for an hour and it was not smoking heavier than normal then I do not think the oil is the problem but could be trash in one of the float bowls causing it to surge. here is an idea, before you pull it out of the water, have a friend drive the boat where the problem occurs and look into all the carbs with a timing light hooked up to the motor, you can see the fuel coming out almost like stop motion, could almost count every drop. If you see one that stops up or comes and goes then look into that carb. and this would also be a good way to see an ignition miss at the same time, by running it on all three plugwires and seeing if it misfires.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Dominick

    Marine Mechanic

    Satisfied Customers:

    1009
    25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
< Last | Next >
  • http://ww2.justanswer.com/uploads/dominickb/2008-12-14_204035_dominick.jpg Dominick's Avatar

    Dominick

    Marine Mechanic

    Satisfied Customers:

    1009
    25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    Rigger, Diagnostician

    Satisfied Customers:

    557
    40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness
  • http://ww2.justanswer.com/uploads/whitesmarine/2009-11-07_025719_07011.JPG John White's Avatar

    John White

    Marine Mechanic

    Satisfied Customers:

    306
    11 years experience working on outboards, inboards, sterndrives & pwcs
  • http://ww2.justanswer.com/uploads/OL/oldnewenglandmarine/2012-9-8_15014_icon.64x64.jpg Jason's Avatar

    Jason

    Marine Mechanic

    Satisfied Customers:

    7718
    Degree in Marine Technology. Gas and diesel marine mechanic.
  • http://ww2.justanswer.com/uploads/JA/jacksparrow1956/2011-1-16_191846_009.64x64.JPG Tan's Avatar

    Tan

    MerCruiser Certified Technician

    Satisfied Customers:

    7330
    39 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
  • http://ww2.justanswer.com/uploads/JE/JeffGr/2012-6-15_14217_20001003AA1.64x64.JPG Jeff G.'s Avatar

    Jeff G.

    Marine Mechanic

    Satisfied Customers:

    4172
    39 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance
  • http://ww2.justanswer.com/uploads/dkreines/2008-3-22_155128_daveja.jpg Captain Dave's Avatar

    Captain Dave

    Marine Mechanic

    Satisfied Customers:

    2672
    USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience
 
 
 
Chat Now With A Marine Mechanic
Larry B.
Larry B.
Marine Service Tech
574 Satisfied Customers
Mercury/Mercruiser Certified/Verado/DTS / Yamaha Two and Fourstroke Certified 27 years experience