Mercruiser 4.3L loses power and surges when hot
 

After about 30 to 40 minutes of running at 3000RPM, my 86 4.3L 205 HP
Mercruiser starts losing power and when you slow down, it surges heavily and
stalls often. I have a clear gas filter in the line next to the carb and it
is still full of gas. The engine is not overheated.

Any ideas?

Mercruiser 4.3L loses power and surges when hot
 

JV wote:
After about 30 to 40 minutes of running at 3000RPM, my 86 4.3L 205 HP
Mercruiser starts losing power and when you slow down, it surges heavily and
stalls often. I have a clear gas filter in the line next to the carb and it
is still full of gas. The engine is not overheated.

Any ideas?

I have a 5.7 mercruiser that may have had a similar problem. After
much frustration and wasted effort (changing the water separator
repeatedly, draining the fuel, flushing the system, blah blah) I met a
guy that had the solution. He told me the fuel line insulation had
been removed and it was vapor lock. I thought he was crazy but just
placing some styrafoam type insulation like you see on water pipes has
solved my problem for over a year now. I don't know if it applies but I
hope it may help.

Jerriko