- Your online store for all types of marine engines and boat parts.
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
Get instant online access to repair manuals for your Mercury / Mariner outboard. Online Manuals
Order printed Mercury / Mariner service manuals — shipped to your door! Printed Manuals
Use engine diagrams to find & order parts for your Mercury / Mariner engine. Engine Diagrams
Find parts quickly with Mercury application guides. Quick Parts Guide
Results 1 to 6 of 6
  1. #1

    Default 1985 Mercury 50HP starting problems

    Hi, I have an old 4 cyl. 1985/1986 Mercury 50HP, I believe it is the type ELPT. I have recently brought it up to date by replacing failing fuel lines, put in a fuel filter, replacing one of two fuel pump gasket kits and replaced the switch box.
    It worked fine this spring, but is now giving me a hard time starting it. When it starts, it's all good and normal, but to get it to start takes too much cranking. I drain the battery too much for each start, and it is simply a bad feeling, not being able to rely on the motor starting when I want it to. Being warm, the motor starts quickly.
    I use a bit more than idle throttle, choke, and prime the bulb until hard (requires more than 5 squeezes, though.) After cranking a few times, the bulb is no longer hard. The bulb is new. Usually I sqeeze it again, and repeat this procedure quite a few times until the motor slowly begins to take for it, and finally starts. As it starts, I think it is not raw - it does not smell petrol and it does not smoke much more than normal.
    I have been thinking that maybe the choke (or enrichener) valve may not be working properly. The solenoid does - I can hear it clearly. The bulb, however, puzzles me. It obviously pumps petrol, but why it drains so quickly and still the motor seems like it is not getting petrol, is strange.

    Any help appreciated.


  2. #2
    Join Date
    Sep 2003
    New Tripoli, PA, USA!

    Default Re: 1985 Mercury 50HP starting problems

    IF those carbs have the enrichener system, it may need cleaning--the circuit can get dirty and not flow fuel. Also, this system requires that you do NOT use a lot of idle up--it doesn't work with the throttle advanced.

    If the carbs have a conventional choke, the choke blades need to close TIGHT or they don't do much.


  3. #3

    Default Re: 1985 Mercury 50HP starting problems

    Thanks for the quick answer! The carbs definately have the enrichener system.What do you think about the bulb, then - is that normal?Torfinn

  4. #4
    Join Date
    Sep 2003
    New Tripoli, PA, USA!

    Default Re: 1985 Mercury 50HP starting problems

    Normal. Check to see if the enrichener linkage and solenoid is moving the carb levers up as it should. And don't use hardly any throttle at start up. If none of these fixes work, the carbs will need to be pulled and cleaned.


  5. #5
    Join Date
    Sep 2010

    Default Re: 1985 Mercury 50HP starting problems

    The manual fuel pump ( falsely called a primer ) does not stay hard !!---------------Nor does it have to.

  6. #6
    Join Date
    Jun 2011

    Default Re: 1985 Mercury 50HP starting problems

    If you have a fuel enrichener system then push the key in while cranking. This will get more gas into the combustion chambers when cold to help starting quicker.

Similar Threads

  1. 1985 90hp starting problems
    By mossboss in forum Yamaha Outboard Forum
    Replies: 8
    Last Post: 09-29-2010, 01:38 PM
  2. 1985 50hp johnson gear problems
    By PharmD13 in forum Johnson Evinrude Outboard Forum
    Replies: 1
    Last Post: 07-25-2010, 09:10 PM
  3. Mercury 50hp unknown year and starting problems
    By Kearnes in forum Mercury Mariner Outboard Forum
    Replies: 2
    Last Post: 07-06-2010, 05:02 PM
  4. Evinrude 50HP VRO starting problems
    By yam6 in forum Johnson Evinrude Outboard Archive
    Replies: 2
    Last Post: 07-11-2008, 09:28 AM
  5. 1985 Sea Ray 57 OMC starting problems
    By BobMcGuire in forum Volvo Penta Gas Archive
    Replies: 3
    Last Post: 03-06-2006, 02:33 PM

Posting Permissions

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