Fuel Supply - Whisper Power W-SQ-Pro Installation Manual

2.3.2

Fuel supply

1 FUEL TANK
Fuel tanks should be made of appropriate material such as
(stainless) steel or plastic. Steel tanks should not be
galvanized or painted inside. Condensation can occur in
metal tanks when temperature changes. Therefore, water
accumulates at the bottom of the tank and provisions should
be made for the drainage of this water.
The tank will need a filling connection, a return connection
and an air ventilation connection which will require
protection against water entry.
Some official regulations do not allow connection points at
the base of the fuel tank; connections are to be made at the
top of the tank with internal tubing down to a few cm above
the bottom of the tank. Using the existing fuel tank of the
car-engine the fitting should be carried out with extra care.
Both a supply line and a return line should be installed and
go into the tank from the top. Interference of the two
systems (car engine and generator engine) should be
avoided.
Do NOT connect the fuel lines to the lines
of the mobile/land applications engine fuel
supply.
Fig. 8: Fuel supply (fuel tank is above the generating set)
1 Fuel return
2 Fuel supply
3 Prefilter / Water separator (optional)
5 Fuel Tank
June 2021 W-SQ-Pro 15 and W-SQ-Pro 18
Driving the tank empty below the level of
the suction pipe of the generator could
make it necessary to bleed the fuel
system.
2 FUEL LIFT PUMP
The generating set itself is equipped with a fuel lift pump;
therefore the tank can be installed at a lower level than the
generating set. See figure 9. The maximum suction height
is 1 m. The W-SQ- PRO 18/15.5 has a mechanical fuel lift
pump that should be primed manually before the first
start/use.
If the pump has to lift the fuel higher than one meter an
external fuel lift pump must be installed (Art. No. 50201061)
or heavy duty pump (Art. No. 50201168). The control board
is already prepared to connect an extra fuel pump. When
using a second electric fuel supply pump, it is
recommended to mount a loose supplied pump close to the
tank and mount it in an angle or vertical to prevent air
bubbles to block the system. The pump will become quite
hot and should be mounted out of touch. (Refer to fig. 10)
The pump makes clicking noises and therefore could be
mounted on rubber mountings. When the clicking noises of
the pump are not acceptable another noiseless pump is
available as an option (Art. No. 50202200).
9