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Thanks I believe 2009 40hp having same problem.

great job Ray, saved me a lot of headache chasing my 115 problem.

Your video was great. I have taken my vst off so many times. I replaced the pumps both high and low, filters…but I still lose power at 3/4 to full speed. It runs great then boom half the power. Then it kicks back in and runs for another 30 seconds then loses it again. I am baffled. What do I need to read fuel pressure? Tire gauge or a fuel pressure gauge?

Thank you!

I have a Yamaha 115 that will not go over 13mph. It idles and runs great until 13 but then seems like it’s starving for fuel. Any ideas?

what brand was the aftermarket pump? It looks like a quantum. I was thinking about getting one on Ebay. think I should go OEM instead?

Very helpful so that I could diagnose today! Thank You!

Thanks Ray. Does it make sense to drain the fuel pump within the VST tank too?

Man it would be really really good if you got a $5 tripod and just did the work instead talking about the work. Just show the work, it’s RUclips after all. Not you talk

how did the aftermarket fuel pump do?

So the fuel pump does not have a relay? I thought I heard one. Mine just died on me but the pump is new. The engine was under water and I fixed it all. It worked and now I cant hear the pump. I thought it was the relay.of the fuel pump.

Great video lots of information i have a question i recently replaced the fuel pump but still doesnt want to start any suggestions

Hey man, stopping in to let you know that this is a great video and has helped me better understand my F115. Ive just started going down the rabbit hole. Just wanted to let you know this video is still helping folks out in 2024. Also, 912 represent!

Amigo buenas tengo un motor parsun no arranca tengo chispa tengo compresión de motor pulsos ... Pero no arranca le eh probado con otra computadora y nada , le hago oler combustible por eo admision y arranca..que será

Hi! ¿When You fuel pump si Bar number?

What year is this motor? And Horse Power?

Great video Ray. Thank you. It's guys like you who help us all to keep things running.

Best explained video I’ve seen !!!!!

I do believe that’s what’s wrong with my motor

Excellent video and heart of a teacher. Wish I had half the patience and knowledge you do. Great job on the video not to mention the actual repair!!!

Wish I sAw this video a week ago

Thanks Ray, your video helped a great deal. Take care my friend. Steve

Junk!

Thanks for sharing your video, now i know where to start to fix my 90hp yamaha outboard...

Great job of trouble shooting and explaining what you are doing.

Great video thank you!

Best video ive seen. Thank you.

Best video on this topic that there is

Thanks for that thorough explanation of the fuel system! I wasn't sure how to proceed with troubleshooting my 115 but i'm ready now!!

What a great video. Most people would have just showed you how to change the fuel pump but you took the time to go through the entire fuel system diagnosis. Very impressed. Thank you

Gday mate this is a great teaching video to help others who have the same or similar problem always take photos because you can be sure the photo you dont take will be the one that stumps you i hoe when you did fire it up you have water running to it i didnt see a teltale maybe just the video .

Fantastic video! Super helpful! Thank you for taking the time to make and post. God Bless you too.

Awesome! Thanks for sharing!

I noticed your nice tidied up garage like mine.

Excellent !!!! East to follow and understand

You are a life saver. I have spent all day trying to work out whats wrong with my outboard. Now i know the problems and know how to fix it thanks to you. Keep making more video GBY.

Hi. thank you very much for you video. My Yamaha F40FETL VST separator is clogged once a year and need to be opened and cleaned. The other fuel filters are always clean as brand new. Do you know how it is possible, and where is the problem ? I think it may be due to a plastic pipe, but i didn't find the problem.

Lifesaver, and thank you. Outboard- 2008 Yamaha F90TLR Issue- upon starting, the outboard would shut off after 10 to 15 seconds. High pressure VST pump inoperable due to never being changed 257 hours (tested outboard for 20 min on land, ran great, bought this boat, and engine failed 100 yards into the water a month later on the first outing). No outboard experience for me however; I used common sense. Followed this video step by step during disassembly. I recommend that when swinging the intake manifold to the open position, keep an eye out on the pivot point as I had the the big intake hose disconnect from the air filter (every outboard is different based on the year). Most importantly, take a video of every step. I took 10 to 30 second videos. I took 2 hours to clean the VST out (used CLR) and insert new original parts (I did not pre-filled the VST pump prior to assembly but I did used marine grease lightly on the gasket). Once I put the VST back together, I started playing the videos from the last one to the first one in that order. I took all day Saturday to disassemble, clean VST, and partially assemble outboard. Putting the new VST was a little stressful yet; found fuel diagram online and followed numbered pictures (I TOOK MY TIME). I only used the lock washer from the old filter that locks the pump and the filter together. Sunday I had a friend assist me finishing up by connecting fuel rail, intake bolts, and double tapping cables that needed plugging back together. After all was assembled, connected water hose, pumped fuel manually by pressing fuel bulb, primed engine 5 times (stick key in ignition turn one click clockwise 5 to 10 seconds you will hear a low buzzing sound, once sound stops, repeat for a total of 5 times), ensure you turn the water on and crank that baby up. I recommend buying Marine Dual Flow Rectangular Outboard Flusher Muffs $15( This will properly flush saltwater outboards). Outcome- issue solved as the outboard ran for about 10 minutes and thoroughly tested. Next is bilge pump, lights, and ensure all safety equipment is up to date to be water ready. Great content video and yes you did help us.

Hey Ray, I have a similar situation but I am not getting any power to the high pressure fuel pump. The fuses all have power, is there a specific relay that controls the fuel pump power or does it come from the main ECU?

Great video!!!! Thank you sir!

You are a good man, just saved me a small fortune. Thank you

Thanks this is one of the best videos on this subject good job

Thank you sir. Well explained, so well in fact, even I could understand it.

Thank you for a wonderful explanation

Excellent step by step. TY

I am not a 100% sure ... BUT !!! I believe on most of today's modern ignition systems you cannot use a ground to test voltage to a component like the fuel pump. If you look at a schematic, you will see that the ground wire is connected in the computer module, and not to the engine block,, In Most systems today, the ground is switched or controlled by the Computer Module. Please someone correct me if i am wrong,

I'm having similar problem except i'm not getting voltage at the fuel pump. I get about .05 volts. I've read it might be the ECM? any suggestions? Thank you

I think this is the exact problem with my 115 Yamaha. It'll only start with starting fluid and is not getting gas for some reason. I'll order that part and will get back to you.

Soooo, nobody asked what that car is under the cover yet, so here you go. What's the partially covered car?

Very excellent video, well explained! Thanks!