I have a Mitsubishi BD2 bulldozer that has been running great for years. Yesterday I went out to start it and I had air in the fuel lines. I primed it and it would start but not rev. Air keep getting back in the lines. I am thinking it is a worn priming pump. Any input from anyone would be great. Plus I went online to look for a priming pump and can not find one. Where can I get one.
Air in fuel lines
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CausticUrbanCoast
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First thing to check are all your fuel line connections. They get old and brittle and start leaking when the inner liner cracks over the barbs or flares.
Are you sure you need a priming pump? Lots of engines are gravity fed to the pump.
Are you sure you need a priming pump? Lots of engines are gravity fed to the pump.
CausticUrbanCoast
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I am curious, how are you correlating air in the fuelline with water in the fuel tank?
Peter 315
Super Member
post 3 Just found small leak in fuel filter (rust hole). I will replace and retry. Did it rust inside out or outside in ?
CausticUrbanCoast
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Great to hear.
Thank you for all your help, She is still running BUT the Mitsubishi BD2 6 way blade started moving sluggish and then quit.
Filter is new and hydraulic fluid is full. If I let it set for 15 min it will move slow and then stop again. What a day! I just walked all the way to the house to post this.
Filter is new and hydraulic fluid is full. If I let it set for 15 min it will move slow and then stop again. What a day! I just walked all the way to the house to post this.
CausticUrbanCoast
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This probably belongs in a new thread.
You did not mention the strainer, was it checked and cleaned when you changed fluid?
Short of that; if it starts sluggish and drops when the fluid warms up, I come to two possibilities: your hydraulic cooler is failing or there is a problem with the hydraulic pump/return line.
It is unlikely the cooler.
Actually a third thought comes to mind that I've witnessed happening once; when refilling a hydraulic system they filled it to the full line, but did not take into account the amount required for the lines. Once the system started up, the hydraulic fluid dropped below capacity. Basically, there was not enough fluid to keep the system running.
You did not mention the strainer, was it checked and cleaned when you changed fluid?
Short of that; if it starts sluggish and drops when the fluid warms up, I come to two possibilities: your hydraulic cooler is failing or there is a problem with the hydraulic pump/return line.
It is unlikely the cooler.
Actually a third thought comes to mind that I've witnessed happening once; when refilling a hydraulic system they filled it to the full line, but did not take into account the amount required for the lines. Once the system started up, the hydraulic fluid dropped below capacity. Basically, there was not enough fluid to keep the system running.
