So... I thought the smell I was experiencing was coolant leak... I’ve been tearing apart the engine over and over again to find it, and going extra lengths to ensure no leak. There truly is no coolant leak now as the level never drops... so what’s the smell? My wife went for a trip with me and when the smell came again - after heavier acceleration- or slowing down greatly after highway speeds - she said that’s a gas smell. As soon as she said that, it took me a while to come around, but she’s right ( the injector washers I need to replace too, like Tortellini just did. So that’s interesting though. Because I was expecting coolant smell, that’s what I smelled? Damn weird. I think the pattern of it occurring maybe reflects the high fuel pressure state until the fuel pump settles down into regular pressure mode in slower speeds? The return line can’t take the fuel back as fast as it should because of the weak worn out o-rings on the injectors?