DB 885 Won't keep running.

For quite a while now I have been unable to keep my 885 running for more than a minute or so, usually a lot less than that. I have had the injectors
and the injector pump rebuilt. I changed the fuel filters. I cleaned out the fuel tank and made sure I'm getting a steady flow of fuel to the filters.
I removed the air cleaner just to see if air flow might be the problem. Nothing has made a difference. I have to use a little starting fluid to crank
it. It runs for anywhere from 15 seconds to a a minute, then starts slowing down and kills. If I spray a little starting fluid into the air intake
when I hear the motor start to slow down, it picks back up and runs a while longer. I am at my wits end trying to figure out what the problem is. The
lift pump seems to be working okay because after I changed the filters, I worked the lever on the bottom of it long enough to fill the new filters and
get diesel coming out of the little bleeder screw at the top of the pump. Any help would be appreciated.
 
First thing that comes to mind is the push rod behind the lift pump.

Second would be the lift pump, I have had them prime fine, but not push enough fuel to keep the injector pump happy.
 
If NAPA/WIX filters are used MAKE SURE you didn't make the common mistake of blocking the filter top outer groove with an O ring. That's the fuel inlet on those filters, and an O ring there will restrict or stop the fuel flow completely to the injection pump. Made lots of calls to correct that mistake.
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I believe this is the problem. I removed the steel fuel line that connects the lift pump to the injector pump, then I worked the lever up and down and
barely got any fuel coming out.So I'll put a new lift pump on it and see what happe
ns. But thanks to all of you for responding.
 
This tractor has 2 NAPA 3166 fuel filters in line. So, if I understand you correctly, you are saying to position the upper O ring up inside the top of the filter housing to make a seal, not around the inside perimeter of the filters before installing them?
 
Do as RG says and check the fuel pump push rod when you get the lift pump off. Should have a flat surface and not concaved.
 
(quoted from post at 13:55:33 08/12/18) You mean the rod that is attached to the inside of the pump?

A 3/8" diameter rod that goes into the side of the block and rides on the camshaft to power the pump.
 

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