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Welcome
Need your full model number or serial number, because a GL normally only has a low pressure pump and uses a Carb.
What problems do you have?
Motor will or will not start, running bad, have spark
Two Teens proved it using Trig, and I'm pretty sure AI can find it
https://www.smithsonianmag.com/smart-news/two-high-schoolers-found-an-impossible-proof-for-a-2000-year-old-math-rule-then-they-discovered-nine-more-180985357/
First I really don't know how the boat is normally driven.
Second if the boat was run at 5K rpm lots of times then this may have caused damage
Third You have more than 10% between lowest to highest in compression test. This means there has been a power reduction
Yes, you did not understand what he was saying and how the test were run. No one mentioned of over filling for the reason and were not tested as such.
Car/Truck/Side by side/Others, none of these motors get up around 3500 rpm and higher and stay there for hours. The Foam test does just that and...
If you get in your car and put it and keep it in first gear the motor will over tach if the computer doesn't stop it.
Putting a lower pitch prop on a motor of your type which does not use a computer to stop the over Rev, get you out of the hole faster but will damage the motor. Which from the...
Welcome
Do you actually do that?
Your WOT should be around 4800
Don't know how accurate your gauge but that is 30 psi difference on half the cylinders so 18.8% difference. Generally there should be no more than 10% difference. Running at WOT for long periods can distort valves
Its my understanding that the E over H is a self contained unit. The surge brake actuator would need to be welded so it would no longer move. The truck break controller does everything else. Don't know if a new heavy cable is needed for power.
Member @bruceb58 has them on his trailer
Dealer wanted me to bring the boat in so they could fix. Since I found that both bolts are missing they are sending me the bolt and I'll install
Found another dealer which is also a Formula dealer, said they have 4 Mercruiser tech's. Be checking them out maybe in the fall if not just stopping...
Welcome
You bought it new and this is the first time having this kind of issue
I would suggest start with the easy stuff. Pull plugs and crank to see if any liquid comes out. If no liquid, start checking Bat cables and connections. Could be a corroded cable/connection and full Bat voltage is...
