#2409337 - 06/04/11 08:41 AM
Boat motor question?
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JAY B
6 Point
Registered: 07/09/07
Posts: 922
Loc: Meigs Co.
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I have a mid 80s model 50hp mercury outboard thats acting up. Starts up great and idles fine, blast off fine and after about 100 yards after planing out it starts surging and comes to a stop but never dies. Tried pumping the primer bulb while after planing out when the surging started and it fixed the problem as long as I pumped it about every 10 or 20 seconds! Anybody have any advice on a fix for this problem? Thanks in advance!
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#2409339 - 06/04/11 08:48 AM
Re: Boat motor question?
[Re: JAY B]
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tndrbstr
16 Point
Registered: 10/06/05
Posts: 12157
Loc: knox co tn
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I'd try a new priming bulb first and go from there....
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#2409340 - 06/04/11 08:48 AM
Re: Boat motor question?
[Re: JAY B]
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BuckWild
TnDeer Old Timer
12 Point
Registered: 09/27/99
Posts: 5416
Loc: Memphis or Birdsong Creek
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Is the vent open on the cap of the gas tank? That's what it sounds like.
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#2409347 - 06/04/11 09:09 AM
Re: Boat motor question?
[Re: BuckWild]
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jos3ywales
12 Point
Registered: 10/02/09
Posts: 6023
Loc: Norris Dam
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check the easy stuff first but it also could be a small piece of trash in the carb sucking up.
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Jos3ywales
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#2409349 - 06/04/11 09:10 AM
Re: Boat motor question?
[Re: tndrbstr]
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JAY B
6 Point
Registered: 07/09/07
Posts: 922
Loc: Meigs Co.
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Bulb and line are brand new and I yes the vents are open!
Edited by JAY B (06/04/11 09:11 AM)
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#2409352 - 06/04/11 09:11 AM
Re: Boat motor question?
[Re: JAY B]
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arctic_cat
8 Point
Registered: 11/18/08
Posts: 1957
Loc: Lenoir City,Tn
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sounds like the carburetor
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#2409364 - 06/04/11 09:55 AM
Re: Boat motor question?
[Re: arctic_cat]
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Camp David
12 Point
Registered: 05/31/03
Posts: 5016
Loc: TN
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It sounds like it's either sucking air or possibly sucking the fuel lines closed. Did you use fuel line instead of just vacuum hose when you replaced the bulb?
Just a thought.
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Why are we trying so hard to develop artificial intelligence when we should be trying to cure natural stupidity.
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#2409365 - 06/04/11 09:56 AM
Re: Boat motor question?
[Re: JAY B]
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Hawk
TnDeer Old Timer
12 Point
Registered: 09/03/99
Posts: 6161
Loc: west tenn.
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Bulb and line are brand new and I yes the vents are open!
Check the pick up line and strainer in the tank.
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#2409380 - 06/04/11 10:49 AM
Re: Boat motor question?
[Re: Hawk]
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utfan1
10 Point
Registered: 12/31/06
Posts: 3617
Loc: cleveland,tn
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ethanol crap has eaten the line.replace and only run straight gas/oil mix.
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#2409410 - 06/04/11 12:19 PM
Re: Boat motor question?
[Re: utfan1]
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mike243
14 Point
Registered: 09/06/06
Posts: 9933
Loc: east tn
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fuel pump
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prayers sent for our friends in need every day
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#2409520 - 06/04/11 05:22 PM
Re: Boat motor question?
[Re: mike243]
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Rackseeker
10 Point
Registered: 09/26/02
Posts: 4814
Loc: Franklin County
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I second the fuel pump, do you mix your own oil with your gas or does it have a oil injection? For your wallets sake I hope you mix your fuel and gas.
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#2409619 - 06/04/11 08:51 PM
Re: Boat motor question?
[Re: Rackseeker]
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JAY B
6 Point
Registered: 07/09/07
Posts: 922
Loc: Meigs Co.
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I second the fuel pump, do you mix your own oil with your gas or does it have a oil injection? For your wallets sake I hope you mix your fuel and gas.
Yes , I do mix my fuel and gas! Would it be possible for the fuel pump to work fine for a short distance then act up? After it acts up and I let off the throttle, I am able to take off again with no problems for a couple hundred more yards then the same thing happens again!
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#2409628 - 06/04/11 09:10 PM
Re: Boat motor question?
[Re: mike243]
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Drop 4/5
6 Point
Registered: 06/23/09
Posts: 617
Loc: Morgan Co.
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Ethanol! Rebuild the carb and use rec fuel.
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#2409659 - 06/04/11 09:58 PM
Re: Boat motor question?
[Re: Drop 4/5]
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stik
TnDeer Old Timer
16 Point
Registered: 03/12/99
Posts: 18546
Loc: lenoir city,tn
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did you burn all the gas out of the carb when you took it out of the water?
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#2409706 - 06/05/11 12:25 AM
Re: Boat motor question?
[Re: stik]
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Unicam
Grumpaw
16 Point
Registered: 12/13/00
Posts: 17506
Loc: Dallas, GA. & Cookeville, TN
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Sounds like vacume problem in the fuel line. Is the bulb collapsing at all? Had one on backwards once...yes I admit it!
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#2409709 - 06/05/11 12:31 AM
Re: Boat motor question?
[Re: Unicam]
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Grizzly Johnson
Good ol' Boys "Team Grizzly"
16 Point
Registered: 10/07/08
Posts: 12892
Loc: Mid. TN
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Sounds like vacume problem in the fuel line. Is the bulb collapsing at all? Had one on backwards once...yes I admit it!
x2
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#2409711 - 06/05/11 12:53 AM
Re: Boat motor question?
[Re: mike243]
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Spike
TnDeer Old Timer
10 Point
Registered: 05/31/99
Posts: 2699
Loc: Oakland, TN. USA
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Fule line is collapsing on the inside. Thank Ethonal again. Had the same prob on my 50hp merc. gaet a whole new line from conect to motor to tank including primer bulb. I am 99.9% sure that is the prob
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If the government wants my guns, I will give them the bullets first.
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#2409811 - 06/05/11 08:52 AM
Re: Boat motor question?
[Re: JAY B]
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JAY B
6 Point
Registered: 07/09/07
Posts: 922
Loc: Meigs Co.
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There is a slight difference in the line and bulb assembly, on the old one the bulb was a couple feet down the line from the motor and then there was about 6 more feet or so to the tanks, and on the new one, it is opposite, with the bulb a couple feet from tanks and the long run going to motor, may switch it and see if it helps. BTW, acts up the same with line on either tank! Thanks to all of you for trying to help me out on this, Ideally appreciate it!
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#2409843 - 06/05/11 10:05 AM
Re: Boat motor question?
[Re: JAY B]
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Rackseeker
10 Point
Registered: 09/26/02
Posts: 4814
Loc: Franklin County
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I replaced my fuel/oil pump last year. And mine was acting just like you are describing how yours is acting.
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#2410059 - 06/05/11 06:30 PM
Re: Boat motor question?
[Re: Rackseeker]
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dr
10 Point
Registered: 02/24/03
Posts: 3483
Loc: USA
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Sounds like a fuel starvation problem, but I wouldn't rule out an electrical problem. Are you sure the battery is good? A dead cell in a battery, or bad battery cable connections might allow it to start, but not run very well. Computerized ignitions won't work well ,if they don't get at least 12 volts, and should be about 13.8 across the battery with the engine running, if the alternator is working properly.
I had an electrical problem on a 150 hp outboard once that even stumped an experienced marine mechanic. The motor would run fine for about an hour, then would start surging, and losing power. He replaced the ignition power pack which didn't fix the problem. I later found out that the deep cycle cranking battery was the problem. The deep cycle wasn't capable of supplying the current the engine needed. I got a new battery, and never had any more trouble.
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I spent most of my money on Huntin and fishin, the rest I squandered.
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#2410068 - 06/05/11 06:41 PM
Re: Boat motor question?
[Re: dr]
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dr
10 Point
Registered: 02/24/03
Posts: 3483
Loc: USA
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And, most mercs have a fuel filter where the line connects to the engine, it might be clogged.
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I spent most of my money on Huntin and fishin, the rest I squandered.
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#2410093 - 06/05/11 07:27 PM
Re: Boat motor question?
[Re: mike243]
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7mm08
10 Point
Registered: 09/12/07
Posts: 3915
Loc: In a river hopefully!
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x2
friend of mine had the same problem with a 150 Suzuki right out of the box. Lots of calls later and back to the shop they finally replaced it and no more problems.....good luck
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If gun control was truly about "protecting the public", then the government would first outlaw and confiscate tobacco products! 600,000 Deaths per year!
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#2410098 - 06/05/11 07:38 PM
Re: Boat motor question?
[Re: 7mm08]
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vanleerbuckbuster
8 Point
Registered: 10/04/09
Posts: 1138
Loc: Dickson, Tennessee
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install one of those clear inline fuel filters above the primer bulb to see what kind of flow your getting. this will rule out the fuel pump. if the fuel pump checks out ok then do a spark test. this will rule out any ignition problems. if your getting good spark then order a rebuild kit for the carbs. its either fuel or ignition related so thats what you should focus on
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i told my wife that i would only be fishing 1/2 a day. i assumed she new 12 hours was 1/2 a day!
born free
Thats gun lotion
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#2410114 - 06/05/11 08:07 PM
Re: Boat motor question?
[Re: vanleerbuckbuster]
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mike243
14 Point
Registered: 09/06/06
Posts: 9933
Loc: east tn
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{ Tried pumping the primer bulb while after planing out when the surging started and it fixed the problem as long as I pumped it }
this is what he posted,here is my summary,lack of fuel pressure to carbs or restricted in the carb,fuel pumps use to be cheap.gas is clear & without a flow meter looking at a clear fuel filter would be like looking at a stream,no way to measure flow
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prayers sent for our friends in need every day
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#2410117 - 06/05/11 08:14 PM
Re: Boat motor question?
[Re: mike243]
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vanleerbuckbuster
8 Point
Registered: 10/04/09
Posts: 1138
Loc: Dickson, Tennessee
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2 stroke gas is not clear
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i told my wife that i would only be fishing 1/2 a day. i assumed she new 12 hours was 1/2 a day!
born free
Thats gun lotion
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#2410243 - 06/06/11 05:37 AM
Re: Boat motor question?
[Re: vanleerbuckbuster]
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Paul Burns
TnDeer Old Timer
8 Point
Registered: 03/28/99
Posts: 1808
Loc: Westport--- Carroll County Tn
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I had exact same problem. bet he finds it is connection of fuel line or primer bulb related.
Let us know when you get it fixed.
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Paul Westport-Yuma Tn
On the banks of the Big Sandy River and Maple Creek
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#2416172 - 06/13/11 09:35 AM
Re: Boat motor question?
[Re: Paul Burns]
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Spike
TnDeer Old Timer
10 Point
Registered: 05/31/99
Posts: 2699
Loc: Oakland, TN. USA
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Well what is the verdict?
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If the government wants my guns, I will give them the bullets first.
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#2416197 - 06/13/11 10:38 AM
Re: Boat motor question?
[Re: Rackseeker]
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Living2Hunt
8 Point
Registered: 12/17/07
Posts: 1333
Loc: TN
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I have the same motor and had the same problem. Twice! I work for a marine company and this is where I would start. First, make sure nothing is in the fuel tank. Any piece if debris can stop up the pick up tube. If that's not it, rebuild the fuel pump. That motor has a diafram fuel pump, they wear out. Rebuil it. It cheap and easy. U should be good to go then.
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#2416305 - 06/13/11 01:03 PM
Re: Boat motor question?
[Re: tndrbstr]
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Slaughter-06
14 Point
Registered: 05/03/01
Posts: 8001
Loc: Dyersburg,Tn.
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Mine did the same thing ( 25 Merc ) I would try a new gas line and bulb first I went out and bought a new tank fixed it right up! Tank and line was not much more than what the line was going to cost me.
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