I don't know about wet kits, but my dry kit has a "fuel jet", and a "nitrous jet". The nitrous jet obviously meters the amout of n2o released into the engine.
The fuel jet is used to regulated n20 that is applied to the fuel pressure regulator diaphram. This does not allow gas to return to the tank, therefore spiking fuel pressure.
On my kit the fuel jet is actually a bypass jet. For me to increase fuel pressure on the spray I use a smaller fuel jet. Less nitrous is let into the engine via the vacuum line, and applied to the fuel pressure regulator.
Sorry if that sounds stupid. 4:20 was about 2 hours ago.....
