Thermo King 914970, Manual

Page: 101 / 186

Engine Maintenance
101
Electric Fuel Pump
Operation
The electric fuel pump must be mounted next to
the fuel tank. This pump is designed to push rather
than pull fuel.
Make sure the pump case completes a good
ground with the battery. The pump will not
operate at less than 9 Vdc. The pump is self
priming as long as it is not higher than 30 in. (762
mm) from the fuel in the fuel tank.
Maintenance
Field service is limited to cleaning the bottom
cover and filter. The filter and cover gasket are
replaceable but the fuel pump cannot be repaired.
If it is defective, it must be replaced.
Disassembly
1. Remove the three screws from the cover.
2. Remove the filter, cover and cover gasket.
Wash the filter in cleaning solvent and blow
out the dirt and cleaning solvent with
compressed air. Check the cover gasket and
replace if damaged. Clean the cover.
Reassembly
Place the cover gasket on the bottom cover and
install the filter and cover assembly. Replace the
three screws.
If pump does not operate, check for:
• Ground to the frame of the TK unit
• Clean and tighten electrical connections
• The pump voltage and polarity. It must be the
same as the unit system.
If pump operates but does not deliver fuel, check
for:
• Air leaks in the tubing or connections
• Kinked tubing or other restrictions in the line
• A leaking or distorted cover gasket
• A dirty filter
• A stuck seat in the outlet fitting.
NOTE: Use a fuel pump with a filter
designed for diesel fuel. DO NOT USE
GASOLINE FILTER. Using a gasoline filter
will plug-up sooner.
1. Filter 4. Screw (3)
2. Gasket 5. Cover Magnet
3. Cover
Figure 27: Electric Fuel Pump