vacuum hoses connected to fuel injectors?!?

[Steve85]

Filter to TB should not be vacuum unless the filter is a restriction. and despite what K+N wants us to believe, for 99.9% of cars in their normal operating range, it isn't. The size of the hose was also suspect, it is definitely feeding air to the injectors.

Now MAF to TB should not be vacuum either unless the MAF sensor is flowing less than the engine desires, again typically not the case. I'm not saying it isn't or can't be, but it shouldn't if the system was designed properly. The MAF that came on TPI 350s that peak at 245hp@4500 rpm have fed 600+hp 434's. Resolution is lost but the flow is there.

I do agree with Adam though, it is most likely a secondary cooling method (the fuel is supposed to cool injectors) or possibly some sort of way to improve atomization.