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You might be on to something. Are you batteries held down with straps or metal clamps? Are the terminal connected with wing nuts or machine nuts? Since both batteries died and if the problem were the connection AND you run each motor on a different battery, the electrical issue would be on the...

That info helps. It probably would have narrowed my suggestions had it been included in the post. If it was and I missed it, my apologies'.

get another mechanic. The replace everything one at a time is poor practice assuming you paid for all those parts. The VST pump is an expensive part. Measuring the fuel rail pressure would have been a better approach. I may have asked this before but I don't remember. Does the idle slow down and...

Unlikely but in theory it is possible for the drive shaft to have a slipping pinion gear (exactly how I don't know) or even worse and less probable, the driveshaft could be slipping in the power head where the splines connect. You would think that would make a horrible noise. When the boat revs...

What motor is on it now and what was the original motor model. Could be added weight of motor. How many bodies in the back and is one or more the incredible Hulk? Seriously though, it's a small boat and extra weight aft will charge how it sits 1. you do not want to remove foam. 2 you would not...

Another thought. Do you have anything hanging off of the kill lanyard? Have you tried wiggling the cutoff gizmo to see if the motor dies? Also, did you happen to notice if when the motor dies if the gauges are off of in self test mode?

No the length doesn't matter. That said, if you disconnect the pink sender wire, the gauge should read empty. If you then ground that pink wire to a good ground, the gauge should read full. That is decent test of the gauge and sender wiring. It is not perfect though but easy to do

Looks interesting.

It doesn't sound like a spun hub. What model is the motor? It probably isn't fuel injected but rather carbed. There are possible causes for both types of motors. If carbed, it may have a choke issue where the choke enriches the mixture thinking the motor is cold. If fuel injected, bad TPS's are...

For stick not float type senders, there are situations where the sender reads the resistance for bottom but the tank isnt empty as in the case where the sender lengh is too short for the tank depth. Note also that the sender sits a bit above the tank floor. That can be a half to an inch of space...

In my experience, gas gauge readings are suggestions:) The angle of the boat makes a big difference. To add to the previous comment, a Stern down condition will fool the sender into thinking there is more gas that there really is. Just moving yourself from the helm to the stern can change the...

I've had no luck at all with PTFE in a lot of projects. The marine blue grease is good but messy and will stay messy for a long time. Sometimes I have luck with white lithium grease. In a pinch I will use some of my zipper lubricant:) It is OK for a lot of sliding applications. The real...

What display or gauge did you read the fuel rate ? Regardless, that sounds about right for those motors (6 or so GPH) at those revs At WOT I would expect twice that number

I am not sure what is going on but next time it happens, immediately turn off the ignition for the troubled motor. Come to a stop and remove the cowling. Look at the gas filter to see if the bowl is full, empty or in between. If you can't see the filter insides ( not clear) try pumping the...

Not seeing water "through all cooling ports" whatever that means exactly when the engine is not running is not abnormal. It takes the water pumps to get enough pressure and flow into the power head. One thing to be aware of is that long runs of garden style hoses or the use of shrinkable compact...

I would do the same as you plan to do. There are videos on testing cam position sensor, mostly for cars but there is probably something out there. I assume that the mechanic left the sensors swapped so keep an eye out for oddities on either motor and if you get an alar, whether it followed the...

My bad...Sorry for jumping to the conclusion that you poster on THT. I think this is the post I thought was the same boat https://www.thehulltruth.com/boating-forum/1035941-yamaha-f250-code-072-a-printerfriendly.html

I decided to do some research and what did I find:) You already posted your question on THT and got a lot of responses. Was this post a check on Great Grady information? I don't know but I did learn about one symptom being a high idle. I also said hmmm when I read the post about battery cable...

Since the code cleared after the sensors were swapped I would assume that the act of removing and reinstalling the 'bad' sensor cleared up the initial fault. Sounds good but I am not a believer in 'the error just went away: The proper procedure would have been to replace the sensor but I...

Foam won't give you the strength you need. I would go with something like Coosa board and fiberglass and it would last 'forever'. Coosa is expensive :( Foam core board made for marine applications can work but would have to be sandwiched with fiberglass cloth and resin. I don't know what...