Fuel System
The L32 V6 requires a steady fuel supply
at a steady pressure.
Without that, the engine will not perform properly especially at
WOT. So a
special system was constructed.
Starting with the fuel tank, a new one was
designed. The original tank was pitted and badly scaled
and did not lend itself to fuel injection. A new tank made
from aluminium was constructed. The new tank is larger in
size, able to hold about 14.5 gallons. The tank is baffled
to prevent sloshing and has an outlet as well as an inlet.
It also fits in the original location.
The fuel injection system in the L32 requires
a 'loop'. Fuel exits the tank to a filter and in turn that
is connected to a Bosch high pressure fuel pump. From
there, a short rubber hose is used and connected to a hard metal
line that goes all the way to the engine compartment.
There a rubber hose is used to connect to the fuel rail.
The same method is used for the return line back to the tank.
Any unspent fuel used by the engine is just routed back to the
tank. This prevents vapour lock.
The Bosch fuel pump is highly superior to
the in-tank
variety. The Bosch pump is much easier to work with, and it
does not take up space inside the tank. Also, by using an
inline pump in case of problems it is very easy to fix - there
is no need to take the tank out. Power to the pump
is controlled by the PCM via relay.
The stock fuel cap was
retained - they
look cool as hell and the one that came with the car was in
superb shape. Plus this enabled the use of the
original emissions tank in the trunk. A rubber hose
connects this back to the intake bellows, right after the air
filter on the engine so any 'fumes' get sucked back and burned.
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