Quote:
Originally Posted by Laird Scooby
Even with a fuel return on a carb engine, the pressure and flow is pretty low so it doesn't mix very quickly. With an injection engine, the pumps are generally rated at about 60psi and 30-40 galls/hr (that's a generalisation, specific models can have specific fuel delivery numbers) so if you use say a gallon an hour driving, 29-39 gallons gets circulated round from the tank, through the injection rail and out of the fuel pressure regulator (usually set ~40psi static, again depending on the engine) so as you can see, the pumps are over-specced on injection engines.
The worrying bit there is some vapour from the tailpipe and a sweet smell - is it a bit like you might imagine burned hazelnuts to be but pretty sweet? That's the nearest i can describe, your nose might smell something different though.
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It might be described as burnt hazelnuts, also reminds me of my toy steam engine that used to run on methylated spirits burning to heat the water.