Onan DKHA Series, Installation Manual

5-1

5. Fuel Connections

WARNING

 Diesel fuel is a combustible and can

cause severe personal injury or death. Do not

smoke or allow any flame, spark, pilot light, arc-

producing equipment, electrical switch or other

ignition source around fuel or fuel components,

or in areas sharing ventilation. Keep a type ABC

fire extinguisher handy.

Do not interconnect APU and vehicle engine fuel

lines.

CAUTION

 Either or both engines could starve

for fuel if the APU and vehicle engine fuel lines

are interconnected. Always use separate fuel

pickup tubes and fuel lines.

Install the fuel kit (Figure 5-1) in the top of the clos-

est fuel tank. The longer 5/16 inch pickup tube is for

fuel supply and the shorter 1/4 inch dip tube is for

fuel return. Follow the instructions in the kit. Also

see Page A-5.

If the tank has a five-bolt sender port, use adapter

plate 541-1425 for mounting the pickup tube as-

sembly.

In a 24 inch diameter fuel tank, the pickup tube ex-

tends down to approximately 3 inches from the bot-

tom. To prevent the APU from running the vehicle

out of fuel, it is recommended that the pickup tube

be cut, if necessary, so that it is shorter than the ve-

hicle engine pickup tube. If it is necessary to extend

the fuel pickup tube, use 5/16 inch SAE J30R7 hose

and a stainless steel hose clamp.

Route the fuel hoses away from hot engine exhaust

components, electrical wiring and battery cables.

They should be accessible for inspection and re-

placement, protected from damage and secured to

prevent kinking, contact with sharp edges and chaf-

ing due to vibration.

WARNING

 Routing battery cables and AC wir-

ing with fuel lines can lead to fire and severe per-

sonal injury or death. Keep battery cables  and

AC wiring away from fuel lines.

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TANK SHELL

INSIDE

WASHER

RUBBER

GASKET

NUT

WASHER

1

−

1/4 INCH

1/2 INCH

TANK OPENING

FUEL KIT

FIGURE 5-1. FUEL PICKUP TUBE ASSEMBLY