RE: vulcan 1/8 nitro car problem
Is this a new vehicle, or one that you've had a while? On vehicles that sit for a while, the carb needles sometimes get plugged with fuel residue. Unscrew the needles and using a syringe (or other means) force alcohol (or even fresh fuel) through the carb to soften and release the residue. Or you can just remove the carb, disassemble and clean with alcohol (soak parts for a while first)
If it's a new vehicle, just try opening up the HSN a bit more.
Also, make sure your throttle is open a bit. If it can't suck air, it can't suck fuel.
Any other info you can tell us may help us come up with ideas that can help.