76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Help!

brianmerc

Petty Officer 2nd Class
Joined
Nov 5, 2002
Messages
140
New boater here and I want to use my boat at least 1 time this summer!!! :( :<br /><br />From a cold start, The engine fires up right away, warms up and can idle for a couple minutes. Then, without warning, it just dies! No sputtering... just DEAD! The engine won't start back up after this. It'll crank and crank, but nothing. Every once in a while, it sounds like it will catch to fire up, but it just dies again.<br /><br />The fuel pump was rebuilt last summer, so I am thinking that's not the problem because it doesn't sound like the engine is starving for gas, it just dies. I checked the water separator that I have on my fuel line to see if there is water in the gasoline, and there was no water in the gasoline that I took from the water separator. The boat did sit all water with about 1/4 tank of gas, so I thought maybe there was water in the gas. But I don't think so...<br /><br />I checked the floats in the carbs to see if they were sticking, and they seemed to be okay when I checked them. They were floating okay. The fuel lines on the way to the carbs were full of fuel, so I don't think there is a problem with fuel getting to the carbs.<br /><br />One thing I did notice, was when I was cranking the engine to try and start it, I noticed the bottom and middle carb were dripping a little gas. I was told this was normal, but it just seems weird to me. See the picture below, this is the bottom carb. The red arrow shows where the dripping was coming from. And the green arrow is the small pool of fuel building up.<br /><br />
drip.jpg
<br /><br />Another thing I noticed was when I was trying to start it was a fine mist coming from the general area around the fuel pump. I don't know if the mist was water or gasoline. See the picture below, the blue arrow shows where I was seeing the fine mist. The red arrow shows where the bottom carb is located.<br /><br />
mist.jpg
<br /><br />Why would the engine fire up right away, then die and not be able to fire up again that day?? Any help, suggestions, information or ideas of why the engine would just die and not be able to start up again is greatly appreciated! THANKS!<br /><br />Brianmerc
 

brianmerc

Petty Officer 2nd Class
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Nov 5, 2002
Messages
140
Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Another question: I was also told to check the spark plugs to see if they are wet. Could this be a possibility of why the engine won't start up again? AND if they are wet, what do I do next? Thanks.
 

Barnacle_Bill

Admiral
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Feb 8, 2004
Messages
6,469
Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

It appears you have a bad needle/seat or dirt in one that causing the engine to fllod out. A bad float can cause the same condition.
 

i610288

Seaman Apprentice
Joined
Sep 24, 2003
Messages
37
Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Where you see that fine mist at there is a fuel hose underneath the fuel pump.Maybe you have a crack in the hose or pump or loose hose, or you didn't tighten down the fuel pump enough.
 

phatmanmike

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Joined
Oct 24, 2003
Messages
3,869
Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

check all fuel hoses and you may need a carb rebuild kit( x 3 )
 

JasonJ

Rear Admiral
Joined
Aug 20, 2001
Messages
4,163
Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Mine drip a bit, and it has never been an issue. How is your battery? Those inlines don't like to try to be started on low batteries. Usually once warmed up, they start immediatly. There shouldn't be any mist coming out of anything, I would check the tightness of the bolts and the gasket. Also, check the choke mechanism, it may be stuck shut or otherwise not working properly. Have you pulled and checked the plugs? They could be skanky. It is also possible the carbs are out of adjustment, may need to be enriched a bit. Is this something that has always happened or a new symptom after some work you may have done. It could also just be your starting procedure. I like to crank mine with the warm-up throttle 3/4, once it fires I let it run at high idle (1500 rpms) for a few minutes, then drop it to its normal idle. It is my belief that letting it idle at its lowest point right off the bat when everything is cold is what helps to fowl the plugs. I like to get the combustion temps up quick, but that is just what works for me. Anyway, Good luck...
 

brianmerc

Petty Officer 2nd Class
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Nov 5, 2002
Messages
140
Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

To IBNFSHN: <br /><br />Okay so a bad needle/seat... is that the little part above the float?... so when the carb is filled with gas, it floats up hitting the small metal needle-type thing? Sorry, I dont know what certain parts are called... new boater here! :) <br /><br />To: i610288: <br /><br />I did see that hose under the fuel pump, but from what I could see, I didn't see if there was a leak in the hose or not. I will check it again the next time I open up the engine to work on it. I did notice the screws on the fuel pump were loose, so I did tighten them up... it didn't help though.<br /><br />To: phatmanmike <br /><br />I was thinking about the carb rebuild kit. I know of a place here in the So. Cal. area where I am pretty sure I can get one... actually 3 of them. Do you know exactly what I'll get in the kit? I am thinking a gasket for sure... how about the floats? Will they be seperate? what else? Thanks!<br /><br />To: JasonJ <br /><br />Yeah, mine do drip also, but it was never an issue either, but I am thinking the problem could be anything at this point. My battery is pretty strong. I bought it last summer, so it's still pretty new. What's a inline? :confused: The choke mechanism, I don't think is stuck, cause when I hit the choke button to start the engine, I can see that it's flipping up and doing it's thing. I will check it again though. I haven't checked the plugs yet, I will be doing that the next time I work on it. If the carbs are out of alignment, how do I enrich them? Should I have a mechanic work on that? My starting procedure is just like yours. Throttle is up 3/4 the way, I hold the choke button, then turn the key and it usually fire right up. I let it warm up at about 1400 RPMs, then when I lower the throttle to idle, it idles at 1100 RPMs.<br /><br />This problem is something new :( . The engine ran great last summer and had no problems after I had the fuel pump rebuilt. During the winter months, I was firing up the engine to run it once a month. THEN, in May, right before Memorial Weekend, this problem started when I tried to fire it up before a Lake trip. That's why at first I was thinking water in the gas might be the problem. <br /><br />Thanks for all your help guys!
 

brianmerc

Petty Officer 2nd Class
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Messages
140
Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Ewwww... I just called a local boat repair place and they said the kit to rebuild the carbs are $63.00 a piece. So thats 63 x 3! The gasket kits are only $2.00 a piece... so that's kinda nice.... oh yeah and that doesn't come with the new floats. You have to purchase those serperately... BOO!<br /><br />I'm going to give the mechanics at that place a call to see what they think's going on with the engine...
 

JasonJ

Rear Admiral
Joined
Aug 20, 2001
Messages
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Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Inline is just short for inline six, to differentiate from V6s....If the choke is workin' then that can't be the problem. It should be idling lower than that. Mine idles around 900 or so, and does not stall when put in gear. I am tempted to tell you to have a looksee at the idle mix screws, and experiment with the adjustment. It is also remotely possible that the linkage between carbs and distributor is out of adjustment, idle stop is set too high, or a combintaion of all of it. It can be a headache, but all of that needs to be straight, especially the adjustment between the carbs and distributor. The wrong amount of advance for the amount of throttle can damage the engine. A manual is a must to set all of this, and there is no backyard tweaking like a car, it all must be exact or you get poor performance. The only exception is the idle screw turned a bit rich, that seems to help cold starts and acceleration. Good luck, you'll get through it....
 

phatmanmike

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Oct 24, 2003
Messages
3,869
Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

To: phatmanmike <br /><br />I was thinking about the carb rebuild kit. I know of a place here in the So. Cal. area where I am pretty sure I can get one... actually 3 of them. Do you know exactly what I'll get in the kit? I am thinking a gasket for sure... how about the floats? Will they be seperate? what else? Thanks!<br />
order them online, from www.seatemp.com or www.mercruiserparts.com those two sites have parts diagrams and parts explosion pics so you know what you have and what you need<br /><br />in my kit i got, i got new needle/seat(dont get the kit with the rubber needle, get actual mercury parts) new o-rings and new gaskets... they were 10 bucks each. my floats were still good, as they were 10 bucks each also<br /><br />i just used my boat yesterday. battery was really low, so heed jasonsj's advice. make sure its FULLY charged and all cables are good and clean, no frays or rips in cable jackets.<br /><br />open the throttle all the way and THEN mash the fuel bulb a few extra times, so some gass gets in the crank case....makes cold starts that much easier. these inline motors are bears! need lots of gas and a full battery to start..<br /><br />i start mine with warm up lever 3/4 forward and let idle there for a few mins before putting her back down to normal. on rare occasions , i have had to squirt pre mixed fuel in to the carb throats. once this is done, it fires instantly!
 

phatmanmike

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Oct 24, 2003
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Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

oh, by the way, i heard this from more than a few people. remove the round brass "back drag jet" , its the one at the top of the fuel bowl in front. it allows more air into the bowl passages and faster, better throttle response and better idleing. i removed mine and a difference is noticable. its the jet in the big red circle.....
024904.jpg
<br /><br />...... link to pic if it doesnt show
 

brianmerc

Petty Officer 2nd Class
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Nov 5, 2002
Messages
140
Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

To JasonJ: <br /><br />Yeah, mine idles around 1100, sometimes lower for some reason. I guess it just depends on how the engine is feeling that day.<br /><br />Actually when my engine would run, I'd notice that when I would throw it into forward really hard, like when pulling a skier, it would die. What actually causes that?<br /><br />I guess I can take a look at the idle mix screws. To be honest, I'd have no idea what I'm doing messing with them, since I am new to this and all. I'd be afraid of REALLY screwing something up! I do have the engine manual, so do you think that could tell me what the idle screw should be set at? I'll have to take a look at it... Thanks for the info.<br /><br /> To phatmanmike: <br /><br />Hey, thanks for those links. I will probably have to order something from them. It's good to know that there are web sites out there that sell Mercury parts for my engine. <br /><br />$10 each for your carb re-build kits?? What was that girl at the boat store telling me the price for then for $63.00?!?! Women...ha ha!<br /><br />So only $10 for the needle, o-rings and all that. Cool! I am pretty sure my floats are good, but I might as well get new ones while I'm at it.<br /><br />The engine fires up fine... the first time only I try it. After the engine dies after a few mins... then I can't restart it the rest of the day. Why do you think that is?<br /><br />Before this, I've never had trouble with the engine idling. Do you think that I should remove the back drag jet? Would it keep my engine from dying?<br /><br />Thanks for the help!
 

phatmanmike

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Oct 24, 2003
Messages
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Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

im not sure about mercs, but ive heard of evinrudes with slightly faulty electronics such as coil or power pack that heats up and bocomes no good as engine temp increases...
 

brianmerc

Petty Officer 2nd Class
Joined
Nov 5, 2002
Messages
140
Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

Re: 76 Mercury 1150 - Engine dies after few mins., can't restart! (Pictures) Hel

That's interesting... it almost sounds like it could be something getting too hot, then once it reaches a certain point, it just wont run anymore...<br /><br />Anyone heard of this in Mercs?
 
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