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Old 03-17-2011, 06:03 PM
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Default what are the signs of a diaphram on fuel pump is bad?

im watching my fuel pump spit gas out of the back of it and there is also a needle coming out of the back side too, this is cause the motor shake and sputter real bad. local marine mechanic that has done everything to this 1996 115 johnson, he said i need to go get a new diaphram from certified marine shop up town? i hate to question anyone on something that im not 110% sure of so im wondering is he right or wrong? i have replaced everything from all the fuel lines, primer bulb water fuel seperator this morning, the mechanic said that he just rebuilt the carbs over the summer and flushed out the gas tank too,
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Old 03-17-2011, 06:08 PM
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if the pump is leaking and parts are coming out the back, I would say it needs a new 1
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Old 03-17-2011, 06:13 PM
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yea my thoughts also, but he assure me that when he rebuilt the carbs that he also just put that fuel pump on too, he said that i can buy a rebuild kit for it real cheap,,,,,im thinking why cant i just return it and use the warranty on it? probalay cause i just bought the boat from a guy a few weeks ago?
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Old 03-17-2011, 06:34 PM
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1996 115 hp Johnson would be a VRO/OIS fuel, oil pump ?? OR.... ???? Please enlighten us..
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Old 03-17-2011, 06:53 PM
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Quote:
Originally Posted by james vass View Post
im watching my fuel pump spit gas out of the back of it and there is also a needle coming out of the back side too, this is cause the motor shake and sputter real bad. local marine mechanic that has done everything to this 1996 115 johnson, he said i need to go get a new diaphram from certified marine shop up town? ,
Not sure about Johnson...but I have rebuilt a few Yamaha diaphram pumps and there are no needles....and if a "needle" or anything is coming out of the back of it, it is toast...but it doesn't even sound right....

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that he also just put that fuel pump on too, he said that i can buy a rebuild kit for it real cheap,,,,,im thinking why cant i just return it and use the warranty on it?
If he put this needle pumping diaphram on, he owns it...why you should go to a certified shop to fix his stupidity without getting some cash back is out of the question and amazing to even hear such a suggestion

this guy sounds like a total hack...get your money back first and then go to a real mechanic.
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Old 03-17-2011, 06:53 PM
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i dont believe its a vro motor, but im not sure, all i know is that i mix the oil with the gas, thats what the guy told me when i bought it, plus i wouldnt know where to look if it where. it dont say anything on the cowl about the vro
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Old 03-17-2011, 07:21 PM
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this is the fuel pump right??
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Old 03-17-2011, 07:34 PM
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James...something is very very wrong here...if he put the pump on, the leak and performance is his doing and his ownership...period.

The picture looks like a diaphragm pump, so where components are leaking or shooting out is beyond comprehension...a diaphragm pump is a pretty tight component...usually several pieces of plastic body and the flexible diaphragm and gaskets in between each layer that has fuel passages...thats it...its a simple beast...it flutters back and forth using the negative pressure from the rotating engine to pump the fuel....if he put a new one on, why would it leak and why would he tell you to get another one from a certified mechanic? A new one is probably $50 tops..
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Old 03-17-2011, 07:49 PM
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That looks more like a fuel pump from an 80's Johnson. #2 in this picture is the fuel pump on a 1996 Johnson 115.

Either way, put an entire new pump on, forget about rebuilding it with a new diaphram.
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Last edited by ScarabChris; 03-17-2011 at 08:01 PM.
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Old 03-17-2011, 08:11 PM
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i dont think i made it clear on my earlier post, all the carbs and the new fuel pump and the fuel tank flush was done last summer for the previous owner, but i called the guy i bought the boat from to get his mechanic that he used so i could get more information on what he has done to the motor? im going to get a new one tomorrow from the local marine shop
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Old 03-17-2011, 08:12 PM
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someone bypased VRO pump and installed a regular fuel pump not all that uncommon
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Old 03-17-2011, 08:17 PM
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how can you tell that, will that make my motor spit and sputter cause the vro thing is not on it anymore?
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Old 03-17-2011, 08:25 PM
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it sure as heck won't make a pump spit fuel and needles.....thats a mechanical/install problem......I gotta see this needle....just change the pump...very simple....usually one mounting screw (maybe 2 depending on MFG'er) and the inlet/outlet fuel lines and clamps
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Old 03-17-2011, 08:38 PM
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im telling you on the back of this picture in the pump im assuming that when it builds up to much pressure theres a (needle) or small tube that shoots out and spits gas, trust me i know its there cause i was watching while the motor was running and i noticed where the gas was coming out so i felt back behind the pump with my finger and to see if i could pin point where the gas was coming from and low in behold i held my finger against the pump with pressure and this little needle or tube stuck me in my finger causing my finger to bleed with a nice hole in my finger now!!!!
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Old 03-17-2011, 08:47 PM
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I'm not going to tell you something you're not seeing.....you're there and we're not....just buy a new pump and change it...its pretty easy and not too expensive....if its still giving you problems you will need to get a certified tech to see whats going on......will be interested to know what the outcome is.
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Old 03-17-2011, 08:52 PM
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i will be sure to update on a daily basis, im a new boat owner and new to this site, which i have to say i love both of these new hobbies, especially all the help i have recieved on this site its awesome!!!! hopefully the local shop will have the pump that im looking for, dont make sence how i just took the boat out to the bay this past sunday and it ran perfect all day long and i mean alllll dayyyy long i gave it pure hell and now its running like crap, guess thats part of owning a boat
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Old 03-18-2011, 11:32 AM
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ok put the new diaphranm in fuel pump and the motor has never sounded better, and now it will idle without playing with the throttle, i can actualy walk away from the boat and she will stay running. i also found out today that the motor is a 1985 115 johnson that had the vro pump on it but it has been bypassed.
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Old 03-18-2011, 11:53 AM
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what are the signs of a diaphram on fuel pump is bad?

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