300B geting airlocked

   / 300B geting airlocked #1  

MichelD

New member
Joined
Jun 15, 2019
Messages
5
Tractor
Massey Ferguson MF135 1964, JD300B 1983
Hello there, I have this 300B I use to clear the snow with a 78 inch blower, it does a good job but will get airlocked under heavy load. What happens is that whenever it struggles to keep up with the load, for example the other day blowing wet slushy snow, it drops in rpm and soon stalls. I then can see tiny air bubbles in the glass type fuel filter it is equipped with. The only thing I have done so far is to replace the fuel filter. There is good pressure when I bleed the line at the injection pump inlet and it starts easily once the air comes out the fitting. The tank outlet being very low on that unit may promote the fuel pump to suck air from a leak along that line but it's all nice and dry, no leaks to be seen. I am wondering if I should go ahead a replace the inlet line of the fuel pump or should I look for another answer to that problem. I have attached pictures of the fuel filter type and fuel pump in case it triggers a solution.
Many thanks for your input,
 

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   / 300B geting airlocked #2  
I think you are on the right track with replacing fuel lines.
 
   / 300B geting airlocked #3  
I will suggest to check to be sure fuel tank is venting & there's a good flow from tank to inj pump. Transfer/lift pump could cause engine to stumble while operating.
 
 
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