MarineEngine.com - Your online store for all types of marine engines and boat parts.
PHONE ORDERS
Monday - Friday
9:00 AM - 5:00 PM EST
Click for TOLL-FREE Number
Online Checkout
Special $9.95 Flat Rate Shipping
(800) 209-9624 | Home | Contact | Shipping | Returns | Cart View your shopping cart.
Part Number Search
Shop by engine/drive part number.
Original & matching parts for sale.
Manuals & Accessories
Shop by description, item number
or manufacturer's model number.
Boat Repair Forum Boat Repair Forum   Boat Video Gallery Video Gallery
   
Results 1 to 6 of 6
  1. #1

    Default 1997 Yamaha 150 pro-v - Gas overflowing from carb

    I'm having an issue with my 1997 Yamaha Pro-v 150 this week, first problem with it so far.
    The problem started right after I filled my topside gas tank. I removed it from the boat and took it to an inland gas station (saving a buck) and once got back to the boat and hooked it up, primed the line with the plunger, she would not start (usually fires right up).

    The plunger bulb does get hard when priming, but doesnt stay hard for long. I checked both fuel pump diaphrams which are in good shape with no holes/tears.

    The main problem I do see is that gas is dripping/flowing out of the bottom carb and coming out of the air intake after I prime. I removed the intake and can see the gas coming out of the carb while I squeeze the primer bulb.

    I've taken that bottom carb apart and cleaned it out. Still gas flowing from it as soon as I prime it.
    What else could cause a carb to overflow besides a stuck float?
    Any help would greatly be appreciated

  2. #2
    Join Date
    Nov 2005
    Location
    Chesapeake, Va, US
    Posts
    1,111

    Default Re: 1997 Yamaha 150 pro-v - Gas overflowing from carb

    Did you replace the needle and seat? Adjust the float?
    Bill H PTC USN Ret
    A manual is a cheap investment.

  3. #3
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,115

    Default Re: 1997 Yamaha 150 pro-v - Gas overflowing from carb

    If you squeeze the primer ball hard enough you can force gas past the needle and seat. Does it leak while the engine is running? How does the engine run?
    Chris
    Dockside Marine Services
    Jersey Shore.
    Let the insanity begin.

  4. #4

    Default Re: 1997 Yamaha 150 pro-v - Gas overflowing from carb

    The motor wont even start. I've torn down the carb and cleaned as best I could with carb cleaner. All ports/jets look clean. No debris.

    I have a rebuild kit coming in tomorrow. I will be using this kit: Sierra Part #18-7756


    It doesnt look like the seats are designed to be replaced on this carb. I see no way of getting them out, as there is no access to them from below, and topside they look like this:
    http://outdoorpowerinfo.com/repairs/...eedle_seat.JPG


    Thats where I am as of now....hoping this rebuild kit does the trick. Looking at needles I see no burrs or anything they could get hung up on, but who knows. Been raining cats and dogs here lately so working on the boat has been hard. Will give it a go after work tomorrow and see where the rebuild gets me. I will make sure to measure my floats.

  5. #5
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    3,115

    Default Re: 1997 Yamaha 150 pro-v - Gas overflowing from carb

    Will not start? Not even try to start? Do a compression test and check for spark. Also do a voltage drop test at the starter while cranking the engine. If the starter is not cranking 300-350 rpm, you will not get the engine to start.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Let the insanity begin.

  6. #6

    Default Re: 1997 Yamaha 150 pro-v - Gas overflowing from carb

    Just wanted to update and thank you guys for your help/input. I feel dumb, but relieved. Found a break in my kill switch wire. After rebuilding the carb, which I still think was needed as it was leaking, the motor still wouldn't start and I found I had no spark. A quick search on the forums lead me straight to checking the kill switch, and bingo. Repaired wire, she fired up in about a second and a half, running like a champ.
    Being new to outboard motors, I learned alot this week. I plan on breaking down the other two carbs next month and rebuilding after I take her off the water for the winter so shes ready for next year.
    Thanks again!

Similar Threads

  1. Fuel overflowing from carb
    By piercer808 in forum Johnson Evinrude Outboard Forum
    Replies: 4
    Last Post: 06-13-2012, 05:27 AM
  2. 1997 Merc 4.3LX Gen + Carb Overhaul Kit MCM 175 VS MCM 185 ??
    By belair56 in forum Mercruiser Sterndrive Forum
    Replies: 1
    Last Post: 11-17-2010, 09:47 PM
  3. Overflowing Coolant
    By themons in forum Crusader Marine Engine Forum
    Replies: 17
    Last Post: 02-06-2010, 09:25 AM
  4. Wet carb gaskets 1997 Ocean Pro
    By dingbat in forum Johnson Evinrude Outboard Archive
    Replies: 1
    Last Post: 12-12-2007, 08:23 AM
  5. Carb overflowing Ibm drowning 78 John 140
    By royboy in forum Johnson Evinrude Outboard Archive
    Replies: 2
    Last Post: 07-28-2006, 10:31 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •