Kohler 3.5CFZ User Manual download pdf (Page 68)

TP-5695 12/936-6 Installation

Anti-Siphon Provisions

Anti-siphon devices must be installed if any section of

fuel line lies below the highest point of the fuel tank. The

anti-siphon device should be either a spring-loaded

check valve (tested to function with the particular

installation’s siphon head), or an electrically operated

shutoff valve (UL ignition-protected, tested to U.S.C.G.

Regulations) which may be operated manually. Acheck

valve should be installed at a point above fuel tank’s

highest point, secured to craft’s structure, and be

accessible without removing any permanent structure.

The fuel line section between the tank and check valve

must be located above the tank’s highest point. An

electric shutoff valve should be installed at the tank’s

fuel withdrawal fitting, and be wired to open when the

generator set engine is cranking or running.

Anti-siphon holes drilled in fueldip tubeswithin thetank

are not reliable anti-siphon devices as they become

ineffective when restricted by dirt or gum.

Fuel Lines

Metallic lines should be used from the tank to a flexible

hose section connecting metallic line to the engine fuel

pump. Metallic lines must havewall thickness of at least

0.029 in. (0.74 mm). Seamless annealed nickel copper,

copper-nickel, or copper tubing must be used. The

flexiblesection(necessaryto allow vibrational motion of

the generator set during operation) must be U.S.C.G.

TYPE A HOSE, marked and tagged according to

Regulations. Metallic line mustbe supported within 4 in.

(102 mm) of its connection to the flexible section. See

Figure 6-8 for fuel pump inlet connection.

1. 1/4 in. NPT Female

Pipe Thread

2. Electric Fuel Pump

258000-D

Figure 6-8. Fuel Pump Inlet Connection

Any in-line fuel filters or strainers must conform to

U.S.C.G. Regulations, must be independently mounted

to the craft’s structure, and must be accessible for

servicing without removing any permanent structures.

NOTE

If a fuel strainer is installed, each fuel filter and strainer

must be supported on the engine or boat structure

independent from its fuel line connections, unless the

fuel filter or strainer is inside a fuel tank.

Fuel Pump Lift Capabilities and

Fuel Consumption

Figure 6-9 lists electric fuel pump lift capabilities and

fuel line sizes. Figure 6-10 shows generator set fuel

consumption rates.

Model

Fuel Pump

Max. Lift ft. (m)

Fuel Inlet Size

I.D. in. (mm)

3.5CFZ 3 (0.9) 3/8 (9.5)

4CZ 3 (0.9) 3/8 (9.5)

5CFZ 3 (0.9) 3/8 (9.5)

6.5CZ 3 (0.9) 3/8 (9.5)

Figure 6-9. Fuel Pump Lift and Fuel Line Size

Load and GPH (L/hr.)

Model 1/4 1/2 3/4 Full

3.5 CFZ 0.42

(1.59)

0.50

(1.89)

0.59

(2.23)

0.68

(2.57)

4CZ 0.48

(1.81)

0.55

(2.08)

0.62

(2.34)

0.68

(2.57)

5CFZ 0.44

(1.67)

0.54

(2.04)

0.66

(2.50)

0.80

(3.03)

6.5CZ 0.53

(2.00)

0.62

(2.34)

0.86

(3.25)

1.02

(3.86)

Figure 6-10. Fuel Consumption

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 80 81

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Kohler 3.5CFZ User Manual Page 68

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