Testing of the fuel pump for leaks involves visual inspection and pressurizing to make sure the integrity of the pump and associated lines is maintained with consistent fuel delivery. First steps that normally take place include visual examination of the fuel pump and the lines for any signs of fuel seepage, such as dampness around the connectors or cracks in rubber hoses. Often, leaks are signified by the smell of gasoline or wet spots around the pump that may be causing drops in pressure and a potential hazard.
The fuel pump can only be checked for adequate pressure without leaks using a pressure gauge. For most vehicles, fuel pressure should be between 30 to 80 PSI depending on the model. Technicians then connect the pressure gauge to the fuel rail and observe the reading by having the engine off but the ignition in the “on” position. If it falls off quickly in just a couple of minutes, that could be an indication of a leak either in the fuel pump or in the fuel lines, since fuel should not drop when the system is closed.
More advanced will be leak detection using a smoke machine. How it works: The tool introduces harmless smoke into the fuel lines and pump system, highlighting any small leaks that may not be visible upon normal viewing. Even the tiniest of openings will visibly emit smoke, hence pinning the leak’s exact location. In particular, this method is very effective for older vehicles in which lines and seals might have degraded over time, causing subtle leaks to affect performance.
Other symptoms of a leak in the fuel pump include lowered fuel economy. Because some fuel is lost through a leak, this could reduce the MPG by 10-15%. The loss can be an economic as well as ecological issue. Regular maintenance such as pressure testing and visual inspection prevents small leaks from developing into costly repairs.
Maintenance of fuel system integrity through early eradication of leaks defends the Fuel Pump and makes for safe and efficient operation, hence reducing loss of pressure or waste of fuel.