Primary Filter half full

The same thing happened to me when my secondary filter had a pinhole leak. The primary would be half full everytime I pulled it. I would look for a air leak somewhere between the tank and filter.

 

since it's real hard to find a suction side leak, we've put real low air pressure into the tank to push fuel out through the lines--then the leaks show. Works on the old Cummins anyways.

 

Check your stand pipes in your tanks...I've seen these fatigue and a hairline crack would develop. Also I'm sure it would be leaking and you would already notice it but I've seen the restrictor just below the air compressor in the bypass line get a small hole in it from vibration.

 

There is a fuel restrictor inline in the fuel return line going back to your transfer pump. It's secured just below the air compressor and it's hard to see since it's secured by a rubber coated band and a bolt.

 

Sounds good. Where's Pinckard at? Never heard of that place...If you turned your bypass valve back on more than likely you will see some fuel leakage somewhere while it's running.

 

I'm thinking you are referring to that brass gizmo that resembles an automotive inline fuel filter. The one on my MBN started leaking recently, the rubber coated steel strap wore through the brass at the end, causing fuel pressure to push the o-ring out of place, small fuel spray eventually wetting all the way to the drive axles, but I don't remember it causing my truck to miss, or not keep the filters full. Perhaps my leak wasn't bad enough, it started in early evening, and after driving most of the night, I exited the truck to see the mess.

 

are you suppose to have the cut off on or off coming from the return line going to the transfer pump..my filter is staying no more than half full..and i have changed check valves,filter bases used differnt filters and even changed the primer pump on the secondary base