Installation Manual
UL
POWER
UL350i UL350i
F
UL350i
S
UL 350i
HPS
350i
SA
MI 350A01 Revision No: 7
Date:
2014-09-15
Page:
22
of
60
Optionally a second fuel pump can be
installed as a backup. Ideally fuel should be drawn from tank through a second output on the tank,
otherwise a T-Joint ø12x12x12 is placed between the tank and each pre-filter and is connected with
the same hose and clamps. A non return valve is integrated in the pump/thread extension to
prevent pressure loss.
Important !
Provision should be made for a separate switch on the dashboard to interrupt power supply to the
second (backup) pump. Experience has shown that leaving both pumps running simultaneously can
cause one of the pumps to overheat due to insufficient fuel flow through the pump. This can result
in a pump failure, eliminating backup if/when it is needed. Install an “or-or” switch to be sure that
both pumps never can run together. Before take-off , make a test to be sure both pumps are
working.
A double fuel filter and bracket are included in the “extra fuel pump kit”.
Attention
:
Be sure that all fuel lines and tank are very clean before start. No pump shall be
replaced for claimed defects, where dirt is found into the pump, due to lack of fuel
tank cleaning or pump filter replacement.
Connecting fuel lines
All fuel lines after the pump (except the return line) are under a constant 3bar pressure. Using the
correct type and dimensions of fuel lines and connections is mandatory. We strongly advise against
the use of simple hose clamps to connect these fuel lines. Our optional fuel connection kit provides
the correct type of hoses and fittings. You have the choice between “press-on” “reusable” or “push-
on” type hoses and fittings
The following overview shows how and in what order to connect all the fuel lines. It assumes the
use of parts as provided in the fuel connection kit. In all cases (press-on ,reusable or push-on) the
engine is delivered with prepared an fitted connections as shown on picture 1. Picture 2 shows how
to connect the rest of the fuel lines in case of single pump. Picture 3 shows how to connect in case
of double fuel pump.
Summary of Contents for UL35Oi
Page 2: ......
