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#11888945 - 10/19/16 11:24 AM Mercury Engine Stops
Fishbonz Offline
TFF Team Angler

Registered: 12/30/08
Posts: 3782
Loc: Desoto,Tx. Dallas county
I have an older Mercury 150 hp Blk Max XR4 motor that had a previous owner.The PO had did some performance upgrades,pistons ,carburation etc, that really made this engine fly.Recently ,after a few fishing trips ,I`ve noticed that while idleing it will just STOP and wont start up immediately afterwards.!? When it does start it`s business as usual no loss of power that I can feel it gets up on plane and runs like a scalded dog.My Question is...is it time for a tune up and if so how often should I have one done?
_________________________

Horace aka Fishbonz

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#11889780 - 10/19/16 07:16 PM Re: Mercury Engine Stops [Re: Fishbonz]
Fishbonz Offline
TFF Team Angler

Registered: 12/30/08
Posts: 3782
Loc: Desoto,Tx. Dallas county
48 views and not one response? Cmon guys does`nt anyone have a clue?
_________________________

Horace aka Fishbonz

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#11889881 - 10/19/16 08:05 PM Re: Mercury Engine Stops [Re: Fishbonz]
Capt Jerry Online   content
Outdoorsman

Registered: 12/22/13
Posts: 244
Loc: Cedar Creek Lake
Carb Merc motors do not like being tilted up prior to restarting. Try pumping the primer bulb after lowering the motor. Also, plan to change the bulb and fuel line every few years as they are prone to breakdown caused by the crappy ethanol fuel we are forced to buy.

An annual tune-up by a skilled mechanic is advised. Not sure who in your area is qualified, but you can find good mechanics via this site.

I have an older carb motor and it runs great, but it is definitely harder to start than a fuel-injected motor.

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#11889940 - 10/19/16 08:40 PM Re: Mercury Engine Stops [Re: Fishbonz]
Gamblinman Online   content
Extreme Angler

Registered: 11/26/02
Posts: 2027
Loc: Yantis, TX
Make sure you have the motor trimmed up to keep the exhaust ports above the waterline when idling.
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#11889995 - 10/19/16 09:03 PM Re: Mercury Engine Stops [Re: Fishbonz]
TLW Offline
Extreme Angler

Registered: 11/16/06
Posts: 2004
Loc: ft worth
had one doin' that several years ago... no pattern, jus ever so often... never failed ta restart and run a hole in tha wind.. always got 'em back to tha ramp... never found tha cause!!!

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#11890277 - 10/20/16 07:19 AM Re: Mercury Engine Stops [Re: Fishbonz]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10536
Loc: Littlefield Tx & Lake A. H. US...
Power valves need serviced or replaced. They are one way valves in the bleed system to prevent puddling, that will cause the motor to load up, associated with early Merc carb motors.
_________________________
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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#11891722 - 10/20/16 08:45 PM Re: Mercury Engine Stops [Re: Fishbonz]
OPTI Offline
Extreme Angler

Registered: 06/23/04
Posts: 1297
Loc: Benbrook Tex
Like Gary said check the bleed circuit check valves they could be stopped up or more likely wide open Does it smoke and chug before it dies. If the check valves are bad the fuel will just sit there in intake and drown the motor in fuel......OPTI
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#11893990 - 10/22/16 10:41 AM Re: Mercury Engine Stops [Re: Fishbonz]
lakeman Offline
Extreme Angler

Registered: 07/27/05
Posts: 1853
Loc: cedar creek lake
Not to hijack Fishbonz thread, But can the check valves in the fuel pump be cleaned and reused or is it best to buy whole new fuel pump kit ?, Reason i ask is i have a 19885 v6 175hp that i've had manyyear and this past year it started dieing on mejust like the op here said his were, I've replaced the fuel pump Diaphgragm twice in the past 15 years,
Engine ser.# is OA149036, thanks for any help.
_________________________
Jerry R.


http://www.jackiekennedyfishingguide.com/


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#11895207 - 10/23/16 08:31 AM Re: Mercury Engine Stops [Re: Fishbonz]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10536
Loc: Littlefield Tx & Lake A. H. US...
lakeman new check valves come in the diaphragm kits. Yours being a 1985 would make me want to install carb kits w/new floats.
_________________________
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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#11895231 - 10/23/16 08:44 AM Re: Mercury Engine Stops [Re: Fishbonz]
bronco71 Offline
Extreme Angler

Registered: 02/05/06
Posts: 1049
Loc: Farmers Branch/Sulphur Bluff
There is a diaphragm/gasket only kit and a complete kit with diaphragm, gaskets and check valves, fuel pump check valves are not available separately.

Bleed circuit check valves are available separately....

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#11895768 - 10/23/16 03:58 PM Re: Mercury Engine Stops [Re: bronco71]
Fishbonz Offline
TFF Team Angler

Registered: 12/30/08
Posts: 3782
Loc: Desoto,Tx. Dallas county
Originally Posted By: bronco71
There is a diaphragm/gasket only kit and a complete kit with diaphragm, gaskets and check valves, fuel pump check valves are not available separately.

Bleed circuit check valves are available separately....
Is this kit recommended for the XR4 150 Merc??
_________________________

Horace aka Fishbonz

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#11896431 - 10/24/16 12:12 AM Re: Mercury Engine Stops [Re: Fishbonz]
bronco71 Offline
Extreme Angler

Registered: 02/05/06
Posts: 1049
Loc: Farmers Branch/Sulphur Bluff
I believe there were 2 different pumps used on that one, a square pump and a sort of rectangular one, I have the rectangular one and looked for the fuel pump check valves for a bit as I already had the diaphragm/gasket only kit. After no luck locating the kit with the valves locally and finding out they were not available separately I talked to mechanics and parts dept. at a couple service centers I was told they were not stocked cuz they never go bad and to reuse them and change the diaphragm and gaskets.....if still having problems check/change the bleed circuit check valves...

I rebuilt the pump yesterday reusing the check valves as I did years ago but haven't lake tested it yet. Pretty sure my bleed circuit check valves are original as they have black paint on them, sure wish I would have thought about them when I had the carbs off.....

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#11896776 - 10/24/16 09:59 AM Re: Mercury Engine Stops [Re: bronco71]
Fishbonz Offline
TFF Team Angler

Registered: 12/30/08
Posts: 3782
Loc: Desoto,Tx. Dallas county
Originally Posted By: bronco71
I believe there were 2 different pumps used on that one, a square pump and a sort of rectangular one, I have the rectangular one and looked for the fuel pump check valves for a bit as I already had the diaphragm/gasket only kit. After no luck locating the kit with the valves locally and finding out they were not available separately I talked to mechanics and parts dept. at a couple service centers I was told they were not stocked cuz they never go bad and to reuse them and change the diaphragm and gaskets.....if still having problems check/change the bleed circuit check valves...

I rebuilt the pump yesterday reusing the check valves as I did years ago but haven't lake tested it yet. Pretty sure my bleed circuit check valves are original as they have black paint on them, sure wish I would have thought about them when I had the carbs off.....
Thank you for your response bronco71 What year and motor type do you have?


Edited by Fishbonz (10/24/16 10:03 AM)
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Horace aka Fishbonz

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#11896876 - 10/24/16 10:44 AM Re: Mercury Engine Stops [Re: Fishbonz]
bronco71 Offline
Extreme Angler

Registered: 02/05/06
Posts: 1049
Loc: Farmers Branch/Sulphur Bluff
Originally Posted By: Fishbonz
Originally Posted By: bronco71
I believe there were 2 different pumps used on that one, a square pump and a sort of rectangular one, I have the rectangular one and looked for the fuel pump check valves for a bit as I already had the diaphragm/gasket only kit. After no luck locating the kit with the valves locally and finding out they were not available separately I talked to mechanics and parts dept. at a couple service centers I was told they were not stocked cuz they never go bad and to reuse them and change the diaphragm and gaskets.....if still having problems check/change the bleed circuit check valves...

I rebuilt the pump yesterday reusing the check valves as I did years ago but haven't lake tested it yet. Pretty sure my bleed circuit check valves are original as they have black paint on them, sure wish I would have thought about them when I had the carbs off.....
Thank you for your response bronco71 What year and motor type do you have?


mine is the older 1980 Mercury 150 Black Max

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#11897001 - 10/24/16 12:11 PM Re: Mercury Engine Stops [Re: Fishbonz]
Fishbonz Offline
TFF Team Angler

Registered: 12/30/08
Posts: 3782
Loc: Desoto,Tx. Dallas county
Thanks again sir ! Let me know how your lake test turns out. That could just possibly be what my engine issue is.How much is the diaphragm/gasket only kit and where can I purchase one?
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Horace aka Fishbonz

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