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Almost all racing which
requires refueling uses some form of dry break for the exchange of
fuel. These connectors are high flow nozzles which
automatically start and stop the flow of fuel. The most basic
systems flow well over 8 liters per second. Due to the very
high flow venting the fuel cell can be an issue. This is
handled in one of a few ways. The most basic method is a
large diameter vent hose coming from the fuel cell which leads to a
catch can NASCAR uses this method or the next. The next method
involves a discriminator
valve to separate fuel from vapor. The vapor is then vented
leaving the fuel in the cell. The third method, common in
Indy, utilizes two dry brakes. One to deliver fuel, and one
to capture vapor. Below is a redhead dry break common in
NASCAR, ALMS, GT, and several other bodies.
When the nozzle's outer cover
makes contact with the female end of the break a male probe is exposed.
If everything is lined up the nozzle will open revealing
a forcing cone which aids in rapid delivery. As soon as the
nozzle is pulled back fuel flow automatically stops.
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