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Im sorry, Fadalcnc is who I have been in contact with. Not Fadal factory.
If there is no lines connected to the Y that comes out of the filter unit, it pushes fluid out just fine. If I put a jumper...

I did try that, and the pressure will not come up. And the piston and valve are brand new. I talked with a guy from Bijur, he and an engineer are stumped. I was told to replace the pump. My thought...

The valve inside the reservoir is brand new also.

It worked for years. The metering units appear to be unmistakable. And the pdi valve came straight from Bijur. Here is a link to the pump.
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I was just told by the guy that I purchased these metering units from, that they need 300-400 psi to pass oil through them. If thats the case, then the bypass not even holding 25psi would maybe be...

It will not push the kerosene through. With the filter or without, it bypasses every drop. The metering units are brand new. I appreciate your responses, if you have more keep them coming. Im all out...

I will give it a try, thank you. Im in Forest Lake, MN.

Using a brand new piece of line, so I know there are no kinks or any other restrictions, and disconnected from the manifold it bypasses about 50-75% of the oil near as I can guess.

Correct, always bypassing. Brand new bypass. The down time is killing me, I may have to spring for a whole new pump. Not sure what else to try. It seemed simple enough to replace all the wearable...

Thank you for the reply. It has an airmatic pdi pump, and it seems to be functioning electrically. The solenoid and low lube switch both work.

I have isolated the pump to just one manifold so I...

I have a 3016 that quit taking way lube. The first thing done was to replace the metering units, but that didn't do the trick. I then replaced the seal and oring in the cylinder inside the pump unit....