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I've applied pressure and vacuum to the fuel lines and they hold pressure and vacuum. Couldn't find external leaks but something in the injection pump will open and relieve pressure at higher pressure (pressure valve maybe) . I'll check for the filter in the banjo bolt and download the manual...

Sorry my first post. I found the other thread. I was guessing the injection pump had to pull fuel. New fuel filter and no external leaks. I saw a low volume pump for sale for this truck. I'm guessing it goes into the injection pump but I can't find a manual or diagram for the engine or injection...

Anyone know where I can get a manual for this truck? How the heck does fuel get to the injection pump? Low pressure pump inside the injection pump?

I've followed the lines. They go right from the tank to the injection pump with only the primer head and Filter/water separator in between. No pump in the tank.

Need help with Mitsubishi fuso 4m50. Getting air in fuel lines and engine runs out of fuel. It will run if I continue to prime the fuel. I can't find the low pressure pump on this vehicle. Seems to inject fuel fine but will blow nasty blue smoke on occasion. Does anyone know where the low...

I've spent all day trying to figure why the truck keeps running out of fuel and why it puts air unto the fuel tank (guessing primer assembly leaks internally) It's the mitsubishi 4 cylinder diesel and I can't find any info on this box truck. First how does fuel get to the injection pump? I can't...