I have a 1998 mercury 2 stroke that I have to start at half throttle. When I start running full throttle it runs fine and then stalls like it ran out of gas and then starts surging and sometimes will run full speed again for maybe a quater mile and then starts surging again. I have a stick steer boat so it us impossible for me to pump the bubble where you first prime it between tank and motor.
I have a 1975 Evinrude 25hp 2 stroke. I received it on trade for automotive work. So far I have found a bad coil, bad float in the carb, and timing was off. Replaced the coil, rebuilt the carb, and timed the motor. Im wondering if the person before me took the pump apart because there is RTV on it. When I removed the pump I could see fuel in the mounting area on the motor. If it is leaking there would the motor run for a minute and then die? I have to reprime the bulb everytime.
+Brandon Holmes that's the first thing I would look at. Also is the bulb sucking itself flat? If so I would look at your pickup tube in your fuel tank.
Well I made a rookie mistake. Some one was helping me who was not mechanically inclined. He kept moving things and trying to help me. I was frustrated and put the carb back together. I didnt adjust the float with the rebuild kit. Pulling it back off tonight to see if that is the problem. Thank you for answering my questions. Very appreciated.
So my engine will only start when I rev the engine to full throttle, then will only continue to run if I keep pumping the bulb. But it does not fail if I keep pumping the bulb. I haven’t rebuilt the pump yet but do you have any suggestions?
If gas was leaking out of the screen or any of the sealing surfaces where the gaskets are, that would prevent the engine from trying to turn over, correct?
@@HamiltonLandWorksLLC just bought a 78 7.5hp Mercury yesterday, $120, has good compression at #120 each cylinder and very strong spark on both cylinders, but when I pump the primer bulb on the gas line gas comes out the fuel pump and gaskets sealing surfaces like I mentioned, the guy "rebuilt" the carburetor but it still won't run and I verified that. Did he mess something up? What can I check? It's obviously not getting fuel
There shouldn't be any fuel "leaking" out. Be sure to check your fuel line at the carb. Make sure you're getting fuel TO THE CARB then. If so. Then it's time to remove that carb again. They're very simple to rebuild once you know how to set them up.
Have a 150 mercury and we have replaced the fuel pump and there is no gas getting to the fuel filter that goes into the smaller pump you just showed. Im going to do a pressure test on it. It turns over once then you have to turn the key back off then on to try and turn it over again. It wont keep trying to turn over like it use to. Any hints or clues from what i have described?
Its spinning over and sounds good its just acting like its not getting the fuel to spark. We put it up about 6 years ago and havnt fooled with it. It ran great the last time we had it out little over 6 years ago.
+chad smith you can use clear tygon tubing to see if it is pumping. When the engine stops check your carb bowls. If there is fuel in them it's not the pump.
I have a 2004 mercury 50hp 2 stroke that i am having problem with keeping running. I rebuilt the fuel pump, but it still wont stay running. what else should i look for? the primer bulb is new as of last year, it was one from walmart, going to replace it with oem mercury bulb. anything else i can do to help diagnose this?
Started out where the motor would not stay running, while idling i would have to pump the primer bulb to keep it running, this was worse if i trimmed the motor up in shallow water. So i replaced the primer bulb, did not help, i read where the ethanol in the fuel degrades the gaskets in the fuel pump so i bought the rebuild kit, and rebuilt it. The gaskets in the pump were not pliable anymore so i figured that was my problem. Next trip out the motor ran a little better, but would eventually die out. I went and bought a Mercury brand primer bulb this weekend, but have not tried it out yet. I am running out of things it could be.
it has not, i have disconnected it in several places, and it did not look bad. I also bought some new fuel line that i guess i will install just to be sure.
I have identical fuel pump on my mercury 70. Gas tank replaced, fuel lines throughout, filters all changed, carbs cleaned, new board. Motor intermittently loses power under load. Idles fine. Full throttle only hitting 7mph. Should be going around 28-30mph. Can't figure it out. Any suggestions?
An easy way to figure out if it's fuel related or not, is to drive the boat at full throttle, when it looses power spraw a fuel mixture in the carb throat and see if it pick back up. If it does you're not getting enough fuel. If it doesn't it's something else.
@@HamiltonLandWorksLLC did engine compression test today. All 3 cylinders good. Spark plugs were wet with black oil/watery. Plugs we're changed back in December. I put new plugs in and changed fuel filters. Will try sea foam before tearing carbs apart. What do you recommend as a fuel mixture spray for 2 stroke? I'm reading starter fluid not good for 2 stroke?
Charlie The Wrench that's good to know,I am working on one that won't even start after it died at full throttle.It had been dropping revs intermittently for some time.
My 1977 Johnson 4 hp was pouring gas out of the exhaust I went crazy trying to figure out what was going on I rebuild the carb twice could not figure out why it was spewing gas out of the exhaust. Turns out I did your test on my fuel pump and it was shooting gas straight through that back hole into the crank case
Well, I broke my own rule. I use the acronym K.I.S.S at work all the time and forgot about it at home. Keep It Simple Stupid. The pump passed the test. I noticed on my hose where it connects at the tank, that brass fitting was loose. I turned it 1 and half turns to tighten it against the pick up tube. Im hoping that was sucking enough air to not allow the 3 psi of pressure to the carb. I havent had the time to start the motor yet.
Thanks for the information on checking the fuel pump. Going to take mine off and check. The engine has had carbs built but doesn't start good.
I have a 1998 mercury 2 stroke that I have to start at half throttle. When I start running full throttle it runs fine and then stalls like it ran out of gas and then starts surging and sometimes will run full speed again for maybe a quater mile and then starts surging again. I have a stick steer boat so it us impossible for me to pump the bubble where you first prime it between tank and motor.
Thank you
I have a 1975 Evinrude 25hp 2 stroke. I received it on trade for automotive work. So far I have found a bad coil, bad float in the carb, and timing was off. Replaced the coil, rebuilt the carb, and timed the motor. Im wondering if the person before me took the pump apart because there is RTV on it. When I removed the pump I could see fuel in the mounting area on the motor. If it is leaking there would the motor run for a minute and then die? I have to reprime the bulb everytime.
+Brandon Holmes that's the first thing I would look at. Also is the bulb sucking itself flat? If so I would look at your pickup tube in your fuel tank.
Not sucking its self flat, just empty after the engine dies.
+Brandon Holmes the fuel pump and the pickup tube. Check pick up tube for holes and cracks.
Well I made a rookie mistake. Some one was helping me who was not mechanically inclined. He kept moving things and trying to help me. I was frustrated and put the carb back together. I didnt adjust the float with the rebuild kit. Pulling it back off tonight to see if that is the problem. Thank you for answering my questions. Very appreciated.
+Brandon Holmes not a problem man. Feel free to ask any questions anytime.
So my engine will only start when I rev the engine to full throttle, then will only continue to run if I keep pumping the bulb. But it does not fail if I keep pumping the bulb. I haven’t rebuilt the pump yet but do you have any suggestions?
Definitely need to pull it off and look at the diaphragm.
Same issue man @ wot I have to pump the bulb to keep it running smooth. I’ll check diaphragm thank you
Do you use gasket sealer on them ? My guess is no but they are stuck together well .
+Liam MG no don't use gasket sealer on them. All of your fuel pump gaskets should seal dry. Anything you put on them could end up in your carbs.
+Liam MG no don't use gasket sealer on them. All of your fuel pump gaskets should seal dry. Anything you put on them could end up in your carbs.
Motorcycle and Marine tech life That was one quick reply ! Great thanks 👍🏿
+Liam MG not a problem bud. I'm here to help.
How do test for the higher RPMs , my motor bogs over 4k
If gas was leaking out of the screen or any of the sealing surfaces where the gaskets are, that would prevent the engine from trying to turn over, correct?
No it could still start and run.
@@HamiltonLandWorksLLC just bought a 78 7.5hp Mercury yesterday, $120, has good compression at #120 each cylinder and very strong spark on both cylinders, but when I pump the primer bulb on the gas line gas comes out the fuel pump and gaskets sealing surfaces like I mentioned, the guy "rebuilt" the carburetor but it still won't run and I verified that. Did he mess something up? What can I check? It's obviously not getting fuel
You need to rebuild that fuel pump.
@@HamiltonLandWorksLLC thanks, I will give it a try and report back to you, appreciate the quick response!!
There shouldn't be any fuel "leaking" out. Be sure to check your fuel line at the carb. Make sure you're getting fuel TO THE CARB then. If so. Then it's time to remove that carb again. They're very simple to rebuild once you know how to set them up.
Have a 150 mercury and we have replaced the fuel pump and there is no gas getting to the fuel filter that goes into the smaller pump you just showed. Im going to do a pressure test on it. It turns over once then you have to turn the key back off then on to try and turn it over again. It wont keep trying to turn over like it use to. Any hints or clues from what i have described?
If the engine isn't spinning over properly I'd start with a compression test.
Its spinning over and sounds good its just acting like its not getting the fuel to spark. We put it up about 6 years ago and havnt fooled with it. It ran great the last time we had it out little over 6 years ago.
Just tested the one you showed and its pouring out the back. So i guess i have to replace it also. $152 bucks. Bust out another thousand. Lmmfao
is there a way to test pump instead of gaskets and diaphragm .. I've put gasket kits in and it goes out after about two or three runs ..
+chad smith you can use clear tygon tubing to see if it is pumping. When the engine stops check your carb bowls. If there is fuel in them it's not the pump.
Thank you .. is there any tricks to installing the white pin/plugs on these pumps ?
+chad smith I'm not sure what pin/plug your talking about bud.
the white pins that hold the little diaphragms on the inside of pump
+chad smith ah they're like dowel pins. I never take them out. If they are just standard dowel pins they should go back in relatively easy.
I have a 2004 mercury 50hp 2 stroke that i am having problem with keeping running. I rebuilt the fuel pump, but it still wont stay running. what else should i look for? the primer bulb is new as of last year, it was one from walmart, going to replace it with oem mercury bulb. anything else i can do to help diagnose this?
+crispy83 can you give me a little better description of what it's doing?
Started out where the motor would not stay running, while idling i would have to pump the primer bulb to keep it running, this was worse if i trimmed the motor up in shallow water. So i replaced the primer bulb, did not help, i read where the ethanol in the fuel degrades the gaskets in the fuel pump so i bought the rebuild kit, and rebuilt it. The gaskets in the pump were not pliable anymore so i figured that was my problem. Next trip out the motor ran a little better, but would eventually die out. I went and bought a Mercury brand primer bulb this weekend, but have not tried it out yet. I am running out of things it could be.
+crispy83 has the fuel line itself been replaced? There liner can separate in some fuel house and cause a restriction.
it has not, i have disconnected it in several places, and it did not look bad. I also bought some new fuel line that i guess i will install just to be sure.
+crispy83 facebook.com/Hamiltonracingproducts, this is my business page. Feel free to message me on there so we can discuss this a little easier.
I have identical fuel pump on my mercury 70. Gas tank replaced, fuel lines throughout, filters all changed, carbs cleaned, new board. Motor intermittently loses power under load. Idles fine. Full throttle only hitting 7mph. Should be going around 28-30mph. Can't figure it out. Any suggestions?
An easy way to figure out if it's fuel related or not, is to drive the boat at full throttle, when it looses power spraw a fuel mixture in the carb throat and see if it pick back up. If it does you're not getting enough fuel. If it doesn't it's something else.
@@HamiltonLandWorksLLC thanks. I will try that
@@HamiltonLandWorksLLC did engine compression test today. All 3 cylinders good. Spark plugs were wet with black oil/watery. Plugs we're changed back in December. I put new plugs in and changed fuel filters. Will try sea foam before tearing carbs apart. What do you recommend as a fuel mixture spray for 2 stroke? I'm reading starter fluid not good for 2 stroke?
I just noticed my prime ball not building pressure and fuel coming from the exaust could that be the pump
That would more than likely be your float sticking open in the carb or the float needle seat.
Could you not take the fuel pipe off the carb and turn the engine over to see if the pump is pumping fuel?
Sometimes they'll pump fuel but will also allow fuel to bypass through a torn diagram into the crankcase.
Charlie The Wrench that's good to know,I am working on one that won't even start after it died at full throttle.It had been dropping revs intermittently for some time.
My 1977 Johnson 4 hp was pouring gas out of the exhaust I went crazy trying to figure out what was going on I rebuild the carb twice could not figure out why it was spewing gas out of the exhaust. Turns out I did your test on my fuel pump and it was shooting gas straight through that back hole into the crank case
Well, I broke my own rule. I use the acronym K.I.S.S at work all the time and forgot about it at home. Keep It Simple Stupid. The pump passed the test. I noticed on my hose where it connects at the tank, that brass fitting was loose. I turned it 1 and half turns to tighten it against the pick up tube. Im hoping that was sucking enough air to not allow the 3 psi of pressure to the carb. I havent had the time to start the motor yet.
+Brandon Holmes there ya go bud. Let me know if that was it.
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