Fuel Pipes; Fuel Filters - Whisper Power GV4 Piccolo Installation Manual

Figure 4: Fuel supply (fuel tank is above the Genverter)
Fuel lift pump
Figure 5: Fuel line assembly with fuel lift pump mounted vertically or in an angle
2.7.3

Fuel pipes

When the tank is above the generating set (Figure 4),
WhisperPower recommends ending the return line on the top
of the tank.
When the return is on the top - in case of a leakage the return
line cannot overflow because of siphoning. One will only need a
fuel cock in the fuel supply line. When the tank is below the
generating set (Figure 3) we recommend ending the return line
on the bottom of the tank (A) below the inlet of the supply line.
In this way the fuel cannot drain back into the tank when the
engine is stopped; as the return line will not let air in. This
prevents starting trouble caused by air in the fuel supply line.
Both supply and return fuel pipe lines should be appropriate
material and 8 mm outer diameter tubing. The quality of the
tubing of fuel pipes could be submitted to local regulations
depending on the application of the boat.
The fuel pipes can be plumbed to the flexible hoses which are
on the generating set and have a connection to fit to 8 mm
pipe. This fuel lines fulfils CE standards and are according to ISO
7840 A2.
It is important to avoid bends in the pipes, as they could trap air
bubbles. The return pipe should never be connected to the
EN / M-GV4 Piccolo for marine applications / May 2017
suction pipe. The return line should be of 8 mm diameter and
go straight back to the tank. When the return is too narrow, has
too many bends and goes back to the bottom of the fuel tank,
the back-pressure could be too high. This results in irregular
running of the engine. When the engine runs irregular, one can
check if back-pressure is the problem by disconnecting the
return line just outside the canopy and draining it in a canister.
When the engine runs smooth now, the return piping has to be
changed. It could also help to install a second (electrical 12V)
fuel lift pump in the supply line to increase the
2.7.4

Fuel filters

A fine fuel filter is installed which requires maintenance.
advises to install an extra fuel filter/ water fuel separator near
the fuel tank.
Before starting your generating set for the first time follow the
fuel system bleeding procedure in the user manual.
INSTALLATION
pressure.
7