Installation Manual
UL
POWER
UL350i UL350i
F
UL350i
S
UL 350i
HPS
350i
SA
MI 350A01 Revision No: 7
Date:
2014-09-15
Page:
27
of
60
Use a copper sealing ring on both sides of a banjo and tighten with banjo
bolt or hex cap nut. Do not over-torque (max. 25Nm) the bolts as this could
cause damage to the aluminium thread in the connecting parts.
An M12x1.5 banjo bolt with a 1/8"NPT thread in the head is used on the exit
side of the fine fuel filter to connect a fuel pressure sensor. This bolt is also
provided in the fuel connection kit.
When tightening the banjo bolts that connect to
the engine, use a spanner to hold the injector
block in place (see image on the left). The two
screws on the other side holding the injector
block in place are not designed to take the
torque when connecting the banjo's!
Connect the fuel line coming from the left side
of the engine (cylinders 2+4) to the top hole and
the return line to the bottom hole.
A check valve (non return valve) is highly
recommended in the return line. This is an extra
safety measure in case of fire in the engine compartment. If not installed, fuel could run from tank
to engine through a leaking fuel line even when fuel pump is switched off.
Remark
The fuel pressure regulator is integrated in the right fuel block (between cylinders 1 and 3). It is
connected to the inlet manifold with a cloth braided rubber tube and a small banjo (in front of
starter motor) in order to regulate fuel pressure ±3 bar above inlet manifold pressure. Regularly
check for wear (particularly on the parts where it might rub against the casing or inlet tubes) of this
tube because if it has worn through, not only can the fuel pressure regulator not do its intended
work, (regulating the fuel pressure to 3bar above the manifold pressure) but also the fuel mixture
may become (too) lean and the idle speed may also increase because air could enter the manifold
through another route instead of only through the throttle plate.
Because of the extremely critical nature of the fuel system and fuel lines to the safe operation of
the engine and aircraft, the inspection of all lines and its connections are mandatory before each
flight.
Return line to fuel tank
Fuel line coming from
left side of engine
Summary of Contents for UL35Oi
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