Generator Fuel Leaks and Safety Issues
Re: Onan Marquis 5500 on a 2002 Ford F53 chassis A month ago there was fuel leaking at the fuel pump - the rubber fuel line had gotten old (14 years old) and was cracking around the hose clamp, whi...
Forum Discussion
Onan released service bulletin number of years ago covering these concerns. The worm gear type clamps should not be used, instead use what is called "fuel injection hose" clamp, pictured in previous post.
The fuel filters at carb. is considered redundant to filter at pump, and they were prone to leakage. Onan made a fitting available to replace the filter at carb, p/n A029S253. They also have a better filter, p/n 149-2341-01 to use at fuel pump. This filter has larger diameter than previous filter, and is difficult to install at carb....so replacement fitting should be used here. The newer units, and replacement carbs just have a metal tube to connect fuel line.
The fuel filters at carb. is considered redundant to filter at pump, and they were prone to leakage. Onan made a fitting available to replace the filter at carb, p/n A029S253. They also have a better filter, p/n 149-2341-01 to use at fuel pump. This filter has larger diameter than previous filter, and is difficult to install at carb....so replacement fitting should be used here. The newer units, and replacement carbs just have a metal tube to connect fuel line.
