Guardian Technologies 004270-2 owner manual Fuel Tank, Generator Fuel Supply Lines

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 standpoint of storage and handling. As a result, installers may tend to be careless in their installation practices, which can result in poor engine perfor- mance. 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 starting 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,

(c)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).

◆2.4.1 FUEL TANK

Either the generator must share the vehicle’s engine fuel tank, or a separate fuel tank for the generator set must be installed. All fuel tanks installed on the vehi- cle 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 the fuel pickup tube be two to three 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 peri- ods.

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 J512F, “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.

◆2.4.3 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 inch- es from the tank fuel pickup tubes to prevent air bubbles from entering the fuel supply lines.

28 Generac® Power Systems, Inc.