Operating instructions

4.7 Fuel System
4.7.1 General Description
The fuel is drawn from the vehicles fuel tank through a fuel standpipe.
This standpipe can be utilized on vehicles with a spare threaded port
as shown in figure 405. The Webasto heater utilizes 37° flare JIC fuel
connection fittings. The fuel supply line fitting is a JIC #4 and the
return line is a JIC #6.
4.7.2 Fuel Supply
IMPORTANT!
Keep the submerged end of fuel standpipe at least 2" from
bottom of fuel tank.
The fuel standpipe and fuel line must be installed according to these
instructions to insure proper heater operation.
Fig. 405: Fuel Standpipe Installation
1. Cut fuel standpipe to length, approx. 2" off fuel tank bottom.
2. Install the fuel standpipe.
NOTE
After fuel standpipe has
been cut to length, remove
any burrs.
NOTE
The heater is equipped
with an internal self
priming fuel pump.
CAUTION
If the fuel tank is higher
than the Webasto heater,
the top of the tank may not
be more than 20" above
the heater.
Thermo 230/300 4 Installation
407