The ECU Again, most installations are
dictated by what space is available. There are
several components to site and the first and foremost is
the ECU or Electronic Control Unit, this is the brain of
the system and as with all electronic components, it
needs to be sited in a area free from direct water
splash or rain ingress ( although the ECU is a sealed
unit, it is always prudent to keep it away from moisture
where possible).
The Vaporiser This
components sole purpose is to change the LPG fuel from
liquid to vapour and to regulate the pressure of the gas
supplied to the engine. It can be sited almost anywhere
in the engine bay within reason, but usually ends up
towards the rear and slightly lower than the injector
block(s).
In the Photo to the you will see
that this vehicle has twin vaporizers to the right hand
side of the engine bay, this is for very high power engines,
normally there would just be the one.
Standard
Vaporiser
Powered
Vaporiser
The Injector
Block(s) This component actually
injects the vaporised LPG into the engine via pipework
to the manifold and is controlled by the ECU which in
turn takes its signals from the cars own original petrol
ECU.
The injector
blocks (or Matrix) are usually sited fairly close to the
cars manifold and ideally situated under engine covers
if available.
Map Sensor This unit
is actually a pressure sensor and measures two different
points in the LPG system, one of pressure and the other
of vacuum, The units role,amongst others, is to tell the
LPG ECU whether or not there is LPG fuel present and if
it is at minimum pressures to run the vehicle on LPG.
This information is shown to the end user on the
Dashboard mounted switch.
