Operating instructions

4.7.5 Fuel Stand Pipe

The fuel is drawn from the vehicles fuel tank through a fuel stand pipe. This stand pipe can be util-

ized on vehicles with a spare threaded port, or if no threaded port is available, a 1" hole can be

drilled into the tank and the universal tank boss installed as shown in figure 416. Keep the fuel stand

pipe 2" from the bottom of fuel tank.

Fig. 416: Fuel Stand Pipe

Fuel stand pipe installation:

1. Cut or extend fuel stand pipe to length, approx. 2" off fuel tank bottom. Remove burrs from cut

end.

2. Install the universal fuel stand pipe

- use 1/4" or 1/2" spare port on fuel tank (if available) and install fuel stand pipe

- drill 1" hole on top of tank (assemble tank-boss and fuel stand pipe) and install assembled

universal fuel stand pipe

3. Connect fuel line from fuel metering pump to fuel stand pipe using rubber connectors and clamps.

4. Route and secure fuel line from heater to fuel tank.

4.7.6 Fuel Filter

The Thermo 90 S heater may be equipped with a fuel filter.

Fuel filters require changing at least annually and in cases of dirty fuel more often.

426

4 Installation Thermo 90 S

NOTE

Fuel stand pipe with universal tank boss can be installed from outside of tank. First assemble fuel

standpipe and tank-boss and simply work through 1” hole previously drilled into tank. Tighten

down with nut provided. Do not over-tighten.

NOTE

If heater is equpped with a fuel filter, change filter at least annually