Pipes and pumps not displaying when plotting

[alexxn]

Can someone help me!
I'm trying to plot in Hidden view but pipes, pumps and other objects are missing when plotting. 
I have attached two pictures of how they are shown in paper space and plotting view. 
Thanks, 

[pothied]

Are the pumps and pipes AutoCAD MEP objects or Fabrication CADmep objects? Any chance of attaching the drawing so I can test here?

[alexxn]

They are MvParts and yes they were created with AutoCAD MEP using Content Builder. I can not attach unfortunately but I've attach a sample drawing with the same issues.

Thanks, 

[pothied]

I downloaded your files and experience the same problem with your custom parts. However, if I insert an out of the box part (like a base mounted pump) into the drawing, the out of the box part hides just fine. I'm thinking that there must be a problem with how you created the part. Do any of the custom parts that you have created hide correctly? Can you provide steps on how you built your part?

[alexxn]

The funny thing is that now everything is working, now the pumps are shown. 

But, still like that drawing that I send you has the same problem now. 
I'm confused right now, I just don't get what is going on.  
Here are the step of how I built my parts: 

Manage >  Content Builder  > Under "All Installed MvParts (US Imperial)" I have diffrent folders for each custom part that I have. 
Select a folder, then click" New Block Part" > Add "Name" and "Description" > "Ok" 
Select "Type", "Layer Key", and "Subtype" from the MvPart Builder > "Next"
Click "Add Part Size"(square with plus sign) > Select your part form the list > "None" >  "Generate Blocks" > Select  "All Directions" > Ok > Next
Select "Generate an Image" > Generate > Next
Right click > Add Pipe Connector > Set all your connections  > Ok > Right click on your "Connections" > Edit Placement > Set "Connection Type", "Connection Diameter" and "Nominal Connection"  > Select position of your connection/s > Click "Ok"
Click "Next" > Finish

I'm not good at giving steps as you can see
Thanks