Generac Power Systems 004270-1 - Manual (Page 30)

INSTALLATION
Section 2 - Installation
QUIETPACT™ 75D Recreational Vehicle Generator
Because diesel fuels are less volatile than gasoline or
gaseous fuels, they are considered safer from the stand­
point of storage and handling. As a result, installers
may tend to be careless in their installation practices,
which can result in poor engine performance. For
example, a poorly tightened fuel line may not show any
signs of leakage; however, air can be drawn into the
loose connection and cause problems. Air that is
trapped in the diesel fuel system results in hard start­
ing and rough engine operation.
Dirt that enters the fuel system also may cause prob­
lems. Lines and piping must be properly installed
and tightened to prevent dirt from entering. Diesel
fuel must be kept clean.
Factory-installed generator fuel system components
include (a) a fuel filter, (b) a 12-volt DC electric pump,
(cj an injection pump, and (d) interconnecting lines
and fittings. Connect a fuel supply line to the supply
fitting and a return line from the fuel return fitting
back to the tank.
NOTE:
Fuel supply and return fittings located on the gen­
erator are 1/8” NPT.
Use a length of approved flexible fuel hose between
the fuel connection fittings and rigid fuel lines (see
Sections 2.4.2 and 2.4.3).
♦ 2.4J FUEL TANK
Either the generator must share the vehicle’s
engine fuel tank, or you must install a separate fuel
tank for the generator set. All fuel tanks installed
on the vehicle must be constructed, installed, and
restrained
so they comply with applicable codes,
standards, and regulations.
If the generator is to share the vehicle’s engine
tank, separate fuel pickup tubes are required for
the engine and the generator. Generac recommends
that you make the fuel pickup tube 2 to 3 inches
(51 to 76 mm) shorter than the vehicle’s engine
pickup
tube. This prevents the generator from
depleting the entire fuel supply during prolonged
generator operating periods.
------- Mk CAUTION M ----------------
Do NOT tee the generator fuel supply line into
the vehicle engine fuel supply line. If this is
done, the generator will be starved of fuel
when both engines are operating at the same
time. Also, while the vehicle engine is not run­
ning, generator operation may drain the vehi­
cle engine supply line, making it difficult to
start the vehicle engine.
• 2.4.2 GENERATOR FUEL SUPPLY LINES
^ 2.4.2.1 Rigid Fuel Lines
Those lines used to supply fuel from a tank to the
generator must comply with applicable codes, stan­
dards, and regulations. The following general rules
apply to rigid fuel lines:
• Rigid lines should be of annealed, seamless, drawn
aluminum, or steel.
• Lines and fittings must comply with SAE J512E
“Standard Automotive Fittings,” or with ANSI
B126.26 (latest edition).
• Route the fuel line so that at least 2 inches (51 mm)
of clearance is maintained between the line and
any exhaust system parts.
• Do not attach electrical wiring to fuel lines. Route
the wiring so it cannot come into contact with any
fuel line.
• Route fuel lines so that, if they leak, fuel does not
drip onto any electrical or exhaust system parts.
• Use nonferrous metal straps without sharp edges
to secure fuel lines.
• Fuel system components must be accessible, but
protected from abrasion, chafing, road damage,
and kinking.
^ 2.4.2.2 Flexible Fuel Line
Use a length of approved flexible fuel hose between
the generator fuel supply fitting and rigid fuel lines.
This prevents breaking of the line caused by vibra­
tion, shifting, settling, or movement. The following
rules apply:
• The flexible hose must comply with SAE J30B,
“Standard for Fuel and Oil Hose.” It must be
approved for use with diesel fuel.
• The hose should be at least 6 inches (152 mm)
longer than is needed, to prevent the hose from
rupturing if the generator shifts or settles.
4 2.43 GENERATOR FUEL RETURN LINES
The same general rules that apply to fuel supply lines
also apply to fuel return lines.
NOTE:
Locate the diesel fuel return line at least 12 inches
from the tank fuel pickup tubes to prevent air bub­
bles from entering the fuel supply lines.
SB Generac* Power Systems, Inc.