Installation manual

34
Installing the UFLS (Option)
Important Installation Information
The Ultrasonic Fuel Level Sensor (UFLS) should be installed into the fuel
tank before
the tank is installed onto the trailer.
If the fuel tank has already been installed, disconnect negative battery cable
from unit, disconnect and cap all fuel lines, drain fuel from tank and
remove tank from trailer.
• DO NOT connect power to the UFLS until it has been installed into
the fuel tank.
• DO NOT use thread locking compounds as they can cause stress
cracking of the plastic sensor.
• DO NOT apply any type of gasket sealer.
• USE ONLY the new gaskets supplied with the UFLS.
• DO NOT use power tools to tighten the mounting hardware or
damage to the plastic sensor will result.
• DO NOT overtighten the mounting hardware or damage to the
plastic sensor will result.
1. Remove and discard the access cover, gasket and hardware from the
fuel tank. DO NOT reuse any of these parts.
• Confirm the gasket surface area on the tank flange is clean.
Pre-Assembly
NOTE: The mounting holes of the sensor, focus tube, gaskets and
the fuel tank flange are not symmetrical. The holes align only in one
position. The distance between the two mounting holes next to the
notch (see illustration) are further away than the others. These two
holes will be used as a reference point to correctly align the
components.
2. The UFLS assembly should be pre-assembled before installing it into
the fuel tank.
• Slide a gasket up the focus tube to the flange making sure the pin
hole in the gasket is centered between the two mounting holes next
to the notch as shown.
• While holding the lower gasket in place, place the upper gasket
onto the focus tube flange, again making sure the pin hole in the
gasket is positioned between the two mounting holes next to the
notch as shown.
• Place the sensor on top of the upper gasket with the harness
pointing towards the notch on the focus tube flange. All holes
should now be aligned.
• Install the 10-32 screws, lock washers and flat washers onto the
sensor and through the gasket holes to hold the assembly together.
Installation in Tank
3. Insert assembly into fuel tank making sure the notch on the focus tube
is aligned with the notch on the tank flange. When installed correctly,
the sensor harness will be pointed towards the fuel fill on the end of the
tank.
• Hand tighten the five mounting screws in a criss-cross pattern
and torque them to 10-15 in-lbs (1.1-1.7 N•m).
• DO NOT overtighten the mounting hardware or damage to the
plastic sensor will result.
• The fuel tank is now ready to be installed.