8 hours ago, Slurpee said:

I did this mod 8 years ago and I’ve known to the gallon ever since - across three new boats - what my fuel level was. Just go fix the problem yourselves. Malibu would charge you thousands. It cost a couple hundred really. 
 

https://www.wakegarage.com/projects-archive/miscellaneous-projects/accurate-fuel-flow-gauge-r110/

Yeah I stumbled on that last night. Pretty neat. I just know I'd forget to reset the fuel gauge when I refill.

I would bet the loose strainer caused bad suction, and that caused the overheat/purge of coolant.

22 minutes ago, dizzygti said:

Well aware, I've mixed it myself before, however there is a volumetric limit and adaptation range of the controls that can be exceeded by extreme blends.    Adding 100% toluene to 87 to get a tank of 91 would be extreme IMO.   

I think that is definitely more true of ethanol than toluene due to the lower energy density of ethanol.

If I did my math correctly, raising 87 octane to 91 octane with toluene (at 114 octane) requires (91-87)/114 = 3.5%, or 4.5 ounces per gallon.  So one gallon of toluene per 28 gallons of 87 pump gas.

Crew,

2011 23 LSV When I click the boat from neutral into drove, I can here a noise in the vdrive or tranmission area. It's sounds like a fan blade barely hitting on something. It only happens in forward gear. When I accelerate it goes away. The noise doesn't happen in neutral either. My friend looked it up and thought it might be a damper plate. Any help is appreciated 

Inspect the housing of the strainer, not just the cup! I had this crack one winter that I forgot to drain the strainer. I replaced the cup but still had water suction issues. Inspected further and found this. Once replaced I had no issues. 
 

Before taking it to the dealer I would also buy a gallon of coolant and check to see if you can refill, run for a bit and refill again. There is probably air in the system. I also had a leak from the coolant cap at @csleaver mentioned that caused low coolant. Never got an over heating alarm but had a lot of fluctuation. I ended up adding an entire gallon of coolant over a few fill ups & runs.