Logo
Get instant online access to repair manuals for your Mercury / Mariner outboard. Online Manuals
MercuryMariner
Order printed Mercury / Mariner service manuals — shipped to your door! Printed Manuals
MercuryMariner
Use engine diagrams to find & order parts for your Mercury / Mariner engine. Engine Diagrams
MercuryMariner
Find parts quickly with Mercury application guides. Quick Parts Guide
MercurySierraCDI
Results 1 to 10 of 10
  1. #1

    Default 73 Merc 1150. Fuel pump problems.

    I have 2 triangular pumps, i've only looked at the top one, no rips in the diaphragm, carbs cleaned and functional. Motor runs awesome, just after a while idling or a few revs, it runs out of fuel, as if the pumps not working. i can run to the primer bulb and keep it going, but shouldn't it self feed? The only rebuild kits i can find are 4 bucks a piece, which i'd buy in a heartbeat, but 27 dollar shipping... kinda ticks me off. I need to pull the tank and see if the draw straw is bad, or if it has holes in it. But any tips or helpful advice? More boat related, but its a 72 Cobia C19f Fisherman, single cable steering, pivot bolt style, turns all the way right, and only partially left. I know its motor end, because i've unhooked the cable from the wheel. its still showing 3 inches of shaft. I'll take pics of all of this in the morning and update. Thanks for any help!

  2. #2
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    16,841

    Default Re: 73 Merc 1150. Fuel pump problems.

    Take a look at the removal connection for an air leak, and also consider replacing the primer bulb; I had one where the check valve kept seizing on me, starving the motor for fuel. Drove me nuts 'til I figured it out.

    Jeff

    PS: On my boat, I now eliminate the removable connector completely, joining the fuel hoses to the motor with a short length of tube and hose clamps.

  3. #3

    Default Re: 73 Merc 1150. Fuel pump problems.

    The quick connector is already eliminated. I'll just get a primer bulb just for good insurance. I didn't know there was a check ball in that.

  4. #4
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    16,841

    Default Re: 73 Merc 1150. Fuel pump problems.

    There's two of them, actually.

    Jeff

  5. #5

    Default Re: 73 Merc 1150. Fuel pump problems.

    well, i got my fuel pump rebuilds, rebuilt both, cleaned, new check valves. Same thing. I can't get it to start on its own, no matter how long cranking with choke, without, throttle wide open.. nothing, shoot just a little carb clean, fires right up within seconds.. it'll run untill the bowls empty, i can hear it sputter and prime the bulb and it picks back up. Im about ready to put a 6lb electric fuel pump on this and call it a day, when it runs, she has nuts... any help please..

  6. #6
    Join Date
    May 2007
    Location
    Ireland,the only country in the world you can go North to go South
    Posts
    2,137

    Default Re: 73 Merc 1150. Fuel pump problems.

    Have you changed the primer bulb yet? Check for blockages at the pick up and in the fuel line.Out of curiosity,how far is the tank from the motor?

  7. #7

    Default Re: 73 Merc 1150. Fuel pump problems.

    Quote Originally Posted by haventaclue View Post
    Have you changed the primer bulb yet? Check for blockages at the pick up and in the fuel line.Out of curiosity,how far is the tank from the motor?
    Not yet, 18 bucks for a primer, versus 8 bucks for rebuilds.. haven't played with the tanks yet, i just know the one is clean, i have dual tanks that go to a single filter block, which i bypassed for now to the single clean tank, fresh 5 gallons in it. roughly, 5 feet of hose, maybe less..

  8. #8

    Default Re: 73 Merc 1150. Fuel pump problems.

    Oh and to add, i fired it today without the aid of the choke clean, i've been starting it wrong, need to crack the throttle then choke.. i already order'd a fuel pump.

  9. #9

    Default Re: 73 Merc 1150. Fuel pump problems.

    Well, i bypasses both mech pumps with a tee, so it feeds from bottom and top, with a 3psi electric fuel pump, and so far its great. Friday it goes on the water..

  10. #10

    Default Re: 73 Merc 1150. Fuel pump problems.

    hey let me know if that 3psi fuel pump works i have the same problems to with my 1150 waiting on rebuild kit and new check valves for fuel pump

Similar Threads

  1. Mercury 1150 inline 6cyl blueband problems need help asap
    By Cory247 in forum Mercury Mariner Outboard Forum
    Replies: 10
    Last Post: 09-29-2013, 07:09 AM
  2. 2001 4.3 L Merc Water in fuel or Fuel pump problem?
    By yuey in forum Mercruiser Sterndrive Forum
    Replies: 11
    Last Post: 09-29-2011, 06:23 PM
  3. does a merc 1150 (115 hp) have air filters?
    By dgsmooth in forum Mercury Mariner Outboard Forum
    Replies: 1
    Last Post: 06-21-2011, 05:14 AM
  4. Power trim problems 1987 1150 115 hp
    By jayrllo67 in forum Mercury Mariner Outboard Forum
    Replies: 1
    Last Post: 08-02-2010, 12:09 PM
  5. Problems replacing the fuel pump on my merc 470
    By infinity_656yahoocom in forum Mercruiser Sterndrive Archive
    Replies: 2
    Last Post: 08-16-2007, 08:31 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
  •