GUIDE 5H7344 - Caterpillar

Safety Precautions
To avoid personal injury, always wear eye and face protection when using pressurized air.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
To avoid damage, do not use more than 55 kPa (8 psi) to pressurize the fuel tank.
Do not crank the engine for more than 30 seconds. Allow the electric starting motor to cool for 2 minutes before cranking again.
Use caution. Exhaust fumes can be hazardous to your health. If you operate the equipment in an enclosed area, adequate ventilation is necessary.
Specifications
Table 1
Step 4 (If Needed) Pressure
Pressurize the fuel tank to 35 kPa (5 psi) maximum 55 kPa (8 psi) Introduction
This procedure checks for air in the fuel. This procedure also assists in finding the source of the air.Required Tools
Illustration 1 g03179616
(A) Tooling
Table 2
Tool Item Qty Part No Description
A - 1 2P-8278 Tube As Test Preparation
Remove the pertinent covers to expose the fuel system components, lines, and fuel tank.Test Procedures
Examine the fuel system for leaks. Ensure that the fuel line fittings are properly tightened. Check the fuel level in the fuel tank. Air can enter the fuel system on the suction side between the fuel transfer pump and the fuel tank.
Install a 2P-8278 Tube As (SIGHT GAUGE) in the fuel return line. When possible, install the sight gauge in a straight section of the fuel line that is at least 304.8 mm (12 inch) long. Do not install the sight gauge near the following devices that create turbulence:
Elbows
Relief valves
Check valvesObserve the fuel flow during engine cranking. Look for air bubbles in the fuel. If there is no fuel in the sight gauge, prime the fuel system. Refer to Testing and Adjusting, "Fuel System - Prime" for more information.