Mariner carby leaking fuel. I have a mercury 40hp 2 stroke (1994ish?).

Mariner carby leaking fuel I am pretty green when in comes to mechanics so appreciate the help! I have 1995 25hp outboard Mercury mariner. I disassembled and inspected the carburetors a second time and didn’t notice anything amiss. Needle valve bad. Winterizing? Likely the carbs dumped gas per canoemang. When running and when primed with a bulb the leak occurs at the top of the carb. It was very clean overall, ran a little rough, but okay. Renewed hose and no more leaks. Dec 11, 2016 · I have a 30HP 2 stroke mariner with fuel leaking from a hole in the carby - please see pic. First time post. What could be the issue? Mechanic's Assistant: What is confusing you about this situation? Customer: Should there be gas behind the carbs? Mechanic's Mar 7, 2025 · Summer 2024 I was operating in shallow water and had the engine trimmed up and noticed fuel leaking into the transom area. Since then i have replaced/tuned up many parts, including a thorough carb cleaning and fluids change, and now it runs great, when I can get it going Dec 7, 2024 · I have a 2004 Mercury 25HP 2 stroke. TIA. Any suggestions appreciated. Nov 6, 2021 · If you have fuel leaking out of the carb from a point above the bowl, especially when you pump prime, you likely have a float or seat issue. Does anyone have a ideal what I need to do. dont care ,if you rebuild the carb at breakfast. Also check the float to make sure it isn't leaking or soaking up fuel. The fuel appears to come through A fuel leak from the brass hollow screw on the top carburetor usually indicates a faulty or loose idle mixture screw or damaged O-ring seal. Oct 12, 2012 · Hello, 1999 Mercury 90 elpto. Jun 8, 2023 · Greetings all. Is this fuel leak likely associated with a low end bug with float bowls? My understanding the float bowls effect idle and low end power but once main jet is used then there is no issue" Low End Bug? The Fuel Level in the Bowls affect every aspect of a Carburetor's Performace. Jul 2, 2012 · Re: Mercury 90 fuel leak Will have to check the choke out. put a water seperating filter on the boat between the primer bulb and motor. @CanadaWide Marine I still can't figure out why my marine outboard motor is leaking fuel out of the carburetor. Now same thing carb right side up,you should get air into (empty) carb, needle not seated. <br />Was the motor stalling out on you? Aug 23, 2010 · I have a 1987 Mercury 60 hp that whenever I trim it up the carburetor's leak fuel out the front of the carb throat. . Oct 23, 2010 · Time to rebuild it using new gaskets and especially needle and seat. Mar 22, 2012 · Re: Gas leak when motor is trimmed up? It is normal for some fuel to leak out of a carb bowl when you tilt the motor, past the trim zone. If the Level is too high, the Main Circuit starts too soon, and if too low, the Main Circuit is delayed. If it's running "fantastic", doesn't seem likely to be whacked needle seats or floats. In this video we used this repair kit: https Feb 1, 2010 · I have a 1997 Merc Tracker outboard that is leaking fuel out of the carb primer bulb when the motor is running and when I prime the fuel line primer hard it leaks sometimes out of the carb primer. May 8, 2009 · Re: Carb Leaking GAs? 25hp merc Also a quick check to make sure your (float) inlet needle is doing its job do this. I have a mercury 40hp 2 stroke (1994ish?). Any thoughts? Apr 21, 2016 · Now when I prime the fuel lines it pisses out the top of the carb. Pumping the primer bulb will cause the fuel to shoot out that jet. Can anyone send me in the right direction as to what this might be caused by? The motor hasn't been run for 12 months apparently and when I fired her up fuel was pouring out of this hole. Both will impact . So I pulled them back off the motor and 'gooped' Oct 8, 2012 · Re: 115 "tower" leaking fuel. <br />Try tightening up all the straps along the fuel lines and check the fuel pump it could well be a faulty diaphram. During your process did you tilt up then down? Launch, tilt up? Home, tilt down? Run it, kill it, tilt it? Clean up as much as you can and run the engine looking for fresh indicators. Debris stuck between the needle valve and seat preventing it from closing. Make sure the little spring is intact. When tilted fuel runs out of the carb throat. No fuel leaking. First, carefully remove the screw and inspect the O-ring for cracks or wear. We would like to show you a description here but the site won’t allow us. Get a small length of fuel hose and attach to carb fuel inlet. J Carburetor issues are among the most common problems outboard motor owners face. Could this be a stuck float, can I clean or do I need to disassemble? Customer: I have a 90hp Mercury outboard, and it's leaking gas from the bottom carburetor. Did I,miss place something? looking at parts diagrams it does not appear I'm missing anything. In this video from the Mission Bay Aquatic Center Instructional Series Paul will walk through the fuel system on a outboard motor and learn the process of getting an outboard that has been sitting Jun 9, 2014 · Sounds like the fuel is leaking out of the backdraft jet. Remove the top of the carb and check the float for deteoriation or cracking. The Diagnosis: Upon inspection, the technician discovered that while the float wasn't visibly damaged, it had absorbed a small amount of fuel, making it too heavy to properly shut off the fuel flow. I think one of my carbs is leaking oil and gas. e. Dirty or Defective Carburettors Stale or Contaminated Fuel Fuel Delivery and Flow Keep in mind that 2-stroke outboard fuel problems typically fall into one of two categories; Fuel Starvation & Flooding. Jan 11, 2009 · Re: Fuel leaking from carb Definitely time for a carb rebuild, pay particular attention to the needle/seat & float level. Its leaking from the weep hole as seen here: What is the piece the fuel is leaking from? Do I need to rebuild the whole carb. After doing so, I ran the engine for awhile. This is when the engine is off and the motor is trimmed up. It's number 17 on the link 28 is the gasket. The Solution: Replacing the float and needle valve assembly completely resolved the issue. Could it get stuck open? dumping fuel all the time? The leak from the carb doesn't seem to come out the front of the carb, but it seems to come from somewhere near where the throttle linkage (that connects all the carb's throttle controls) attachs to the carb. I traced it down to it was leaking around the outside of the carb float bowls. From hard starting to rough idle, surging, and stalling, these frustrating symptoms can ruin a day on the water. If I pump the primer bulb with the motor tilted it pours out. Planning on taking the toon out this week-end for a test run and to get some fall pictures. i took off the carby to give it a good clean out, but when i start it now after about 30 secs fuel is pissing out of the hose that cconnects the fuel pump to the carby, the leak is comming from carby end from the hose, any thoughts please as to what could be up thanx. I just bought it (a few weeks ago. Fuel seems to be leaking out of the bottom of the primer/injector of carb We would like to show you a description here but the site won’t allow us. It appears to be coming from the carb. Southern Jun 5, 2010 · Re: 2004 Merc 15HP 4-Stroke Leaking Gas Out Of The Top Of The Carburetor there was a piece of debris between the needle valve and seat. There is a spring in this area on the linkage that has fuel on it, and from Apr 9, 2013 · I'm trying to troubleshoot an issue I'm having with my 2001 25hp 2 stroke Mercury. Aug 26, 2010 · Re: V4 johnson 115 leaking fuel while tilted up and flooding easily I can't think of any way that the float valve can influence the fuel getting drawn out the bowl into the engine. I checked all carbs. Either Jun 7, 2015 · I have a 40 hp 4cyl Mariner with WMA-10s. , tightened up all screws and tapped in the fuel line inlet elbows with a punch. Aug 15, 2021 · The culprit was the needle float in the float chamber, this was stuck open allowing fuel to continuously flood into the chamber and out through the overflow. The carb is flooding. Jan 30, 2004 · Re: gas leaking out the top of my 75hp merc Hey Hawk, if the bulb loses pressure,that means air is leaking into the lines,hence gas leaks out. As fuel fills the bowl, it causes the float to rise and seal off the valve, shutting off fuel flow. Aug 30, 2009 · My 1998 4-stroke mercury 9. I know some fuel dripping is "normal". Jul 17, 2014 · Hi, my friend has a mariner 90hp 6 cylinder which has fuel leaking out of carbies 2 and 3 when primed, I am used to the old Chrysler carbies so I am not sure if he has a float problem or needle and seat problem as the primer will not get hard, he also has an issue with cdi #1 as it isn't sparking on 1,3 and 5. I have rebuilt the carbs and it runs pretty nicely but I have discovered a fuel leak. It seals when I turn it upside down and try and blow in it. Jul 12, 2021 · Early 80s 40 hp. Aug 1, 2010 · Re: Carbs leaking fuel from air intake and top plate??? the little oring usually is not included in the kit, dunno why but its not. Serial # 7207752 Canadian made. Reset the float level. leaking carbs are a sign of incorrect float setting,stuck inlet needles or debris on the needle seat. This comprehensive troubleshooting guide will help you identify, diagnose, and fix the most common outboard carburetor problem Jul 7, 2009 · Re: carb leaking fuel Prowle, that orfice is likely the back drag jet. Check the float level when re-assembling. All it takes is Is your Mercury outboard motor leaking fuel? In this video I show you a very common source of fuel leakage in these motors and how to fix it. 2. The motor runs fine otherwise. May 27, 2013 · Re: Fuel leaking out side of carb Are you sure it's a screw? Each carburetor has a brass fuel bowl vent insert that has a metered hole in it. They seemed to tighten up pretty good. Both carbs leaked like May 10, 2017 · Hello All, BACKGROUND: Last year I got a 2006 9. A strip down and clean solved the problem. Aug 11, 2006 · Re: Fuel still leaking out front of carbs with engine tilted up If it leaks some fuel and stops then that's pretty normal. The carb is groved out and even with a new gasket I could see it still leaking. Removing the cowling there was fuel leaking from the overflow tube. Eventually traced leak to the rubber fuel hose from the fuel tank. If I prime it while the motor is down it fills the bowl like it should and the the bulb gets hard We would like to show you a description here but the site won’t allow us. Oct 24, 2007 · I own a Mariner 3. Stale Two Stroke Fuel turned to Rice Crispies in this Yamaha Carburettor Float Chamber In this article we'll explore common fuel problems for older two-stroke outboards i. This is a 3 cyl 2 carb set up and the lower carb really spills out the gas/oil mixture. I don't know if the carbs leaked before but I did some maintenance like carb cleanup, water pump, seal kit, etc to make it reliable before putting it on my boat. In your case it gets trapped in the airbox until you trim down and then it runs into the cowling, right? We would like to show you a description here but the site won’t allow us. 3 and had a fuel leak last year, outboard is about 5 years old. Sep 22, 2013 · i have a 30hp 2 stroke mariner 1989 model. So far so good. I'vebeenworkingonit since). I have a small amount of the fuel/oil mix coming out from the front of the cowl when I pump up the bulb in the morning or tilt the outboard up. 9 hp outboard leaks fuel from the carburetor. If tapping doesn't fix it, you will need to remove the carb bowl cover and inspect the float and inlet needle. wont work. introduce debris at lunch May 25, 2022 · "2. That will happen when the float sticks open or the inlet needle doesn't seat well. With carb upside down,blow into hose,you should not get any air movement past needle (its seated). If it keeps leaking then your gas tank vent is probably clogged or closed. If gas is leaking out of the fuel bowl vent (see circle in picture below), it's because there is too much gas in the fuel bowl due to: 1. 9 (0R132864) in a boat trade. Tap the bowl of the carb with a screwdriver handle to see if it will break loose. Oct 7, 2011 · Re: Mercury 50 hp 4 stroke carb leaking Just to follow up on this thread. you most likly used the oring for the bowl drain under the needle seat. It still runs ok but when I am fishing I kept seeing gas in the water behind my motor. I removed the carbs and cleaned the bowl and pin, but while they were off, I pumped the fuel bulb, and gas came out of the engine at the bottom carb hole. Leaking from between the top plate that actually says "top". Replace the inlet needle, gasket and seat and the float if necesary. sce0 w8bh ptr 1ycf0b lf0sugbq 41qq1o7 vkzi sgi5 sjap jmf