Hello there! I am seeking assistance in troubleshooting a new diesel fuel leak that has arisen. Although I am a skilled millwright, my experience with diesel generators is limited. I am currently assisting a small non-profit organization in maintaining their diesel generators used for emergency lighting and heating purposes. The lines connected to the primer pump/filter section have always been open-ended. Recently, the one in the attached picture has started gushing fuel, whereas it was only dripping slightly last month. I have consulted the manuals available to me, but they do not provide much information on the parts breakdown. The engine in question is a Hewitt/Caterpillar D330a with the serial number 56B00470, powering a 75kw generator. Any suggestions or ideas on what may have caused this sudden change in fuel leakage would be greatly appreciated. Thank you.
Weep lines are essential in preventing fuel leakage from damaging engine components. When a lip seal in the fuel injection pump/governor deteriorates, it can lead to diesel leaking into the crankcase and causing extensive damage. However, with properly functioning weep lines, the fuel will escape to the atmosphere instead, alerting someone to the issue. Do you know where the weep line leads to in this situation? This information is crucial for maintaining the engine's performance and longevity.
I believe one line is connected to the fuel transfer pump while the other is linked to the governor. However, my experience with the D330 engine dates back to a major restoration and overhaul of the backup generator on the M/V NOAAS Miller Freeman in 1990. Time flies, and it's a reminder that I'm not as young as I used to be.
If the tee valve on the top of the governor housing has come loose and is causing a rattling sound, try pumping the primer and checking for any signs of leakage from that specific line while the engine is not running. This can help determine if there is a potential issue with the fuel system.
I was actually thinking of recommending the same idea.
That's a valid point. Let's start with the basics for optimal results!
Answer: Answer: The increased fuel leakage could be due to various factors such as a damaged seal, loose connection, clogged filter, or a malfunctioning primer pump. It is important to inspect these components to identify the root cause of the issue.
Answer: Answer: In such cases, you can start by visually inspecting the fuel lines, connections, primer pump, and filter section for any visible signs of damage or leaks. You may also consider consulting with experienced technicians or contacting the manufacturer for assistance.
Answer: Answer: To address the fuel leak, you should first isolate the generator from the power source and shut off the fuel supply. Then, carefully inspect the primer pump, filter section, and fuel lines for any issues. Depending on the findings, you may need to repair or replace the faulty components to prevent further leakage.
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