boat losing speed

boatmann said:

Hey everyone, my boat has lost btwn 10-15 miles and hour from 60 to 45 mph WOT. It sounds great and gets on plane quickly. No extra weight has been added, the only thing is I bought gas at the Marina and didn't put Startron gas additive in like I usually do. Last week I lost 5 mph and this week another 10.It is a 7.4 mercrusier with a Bravo 1 drive. I tuned up last year and thinking possibly another is due. I am going to check the gas also. Any other ideas?

thanks

Click to expand...

greg82255 said:

I would start by checking the fuel filter /water separator and make sure there is no water in your fuel. Remove the filter and pour its contents into a clear jar and check for water. Also make sure all the lines are clear and the in-line filters are clean.

Click to expand...

boatmann said:

It is a docked boat.

Click to expand...