Hope you can help with this one...I'm sure it's less of a mystery than I'm making it out to be.
Since I bought my 2002 SAN GT40 in October, it has run at ~140* and not any higher, according to my temp gauge. Additionally, we've seen some small plumes of white steam coming from the exhaust, both while on the lake and in the driveway with the Flush-Pro attached. The exhaust has also smelled a little like gas, I've seen a slight sheen in the water, and the boat has idled a little rough, which to me means that it's running a bit rich.
After putting these all together and doing some more research, I decided to try swapping out the thermostat on the off-chance that the previous owner had replaced it with a 143* instead of the 160*. After popping off the housing, I discovered that the existing stat was in fact correct and looked to be functioning properly. I went ahead and replaced it anyway and ran the boat in the driveway for 20 minutes. It still did not get above 145*. I didn't see any steam and the gas smell decreased slightly, but it's not completely gone.
Does anyone have any idea what's going on? I've always read that normal operating temp for the GT40 EFI is 160* or so--is there a possibility my engine just runs a bit colder? I want to make sure that I'm not wasting gas and potentially causing damage to the engine by having it run this way.
Any help you can provide is appreciated...thanks!