Good morning friends long time lurker of the forum and now I own a bunch of heavy equipment in the tree industry and could use a pointer.
I have a truck with a 1995 dt466 NGD all mechanical. Bosch P3000 pump.
In frame rebuild done last year around June or august
After that it would start right up every time off to the races.
Now, it’s extremely hard to start. It started when it was cold out, but it doesn’t matter - if it’s 60 degrees or 20, it cranks for ever. Occasionally holding wide open would help. Sometimes we can’t get it to start at all.
I replaced every fuel line on the truck. Return lines, feed lines, lines from tank, not one hose on it leaking or sucking air at this point. New primer pump. Primer pump used to get rock hard but now it never seems like it does... replaced it 3 times to make sure I didn’t get a bad pump. It is pushing fuel though.
next item in line was the lift / transfer pump, same thing mounted to the block on a 5.9 Cummins but it goes on the side of the injection pump. Replaced that because I thought I was getting fuel in my oil. Making a little oil and it’s not coolant. Looked like fuel was getting past the stem. So that’s new, thought that could be sucking air making it hard to start.
Primed it up drove around truck always runs perfect once it’s going. If it sits overnight, good luck getting it to start. At this point, I’m thinking it might not be a “priming issue” although I am thinking about putting a 12v inline fuel pump on it. 8psi.
Is it bad to send 8psi to the transfer pump? Factory setup has no electronic pumps.
could something in the injection pump be faulty making it hard for us to make pop off pressure when first cranking? Granted, sometimes it fires up no issue at all as soon as it rolls over.
I don’t think it’s injector related, it runs perfect no smoke lots of power.
Appreciate any insight.
I have a truck with a 1995 dt466 NGD all mechanical. Bosch P3000 pump.
In frame rebuild done last year around June or august
After that it would start right up every time off to the races.
Now, it’s extremely hard to start. It started when it was cold out, but it doesn’t matter - if it’s 60 degrees or 20, it cranks for ever. Occasionally holding wide open would help. Sometimes we can’t get it to start at all.
I replaced every fuel line on the truck. Return lines, feed lines, lines from tank, not one hose on it leaking or sucking air at this point. New primer pump. Primer pump used to get rock hard but now it never seems like it does... replaced it 3 times to make sure I didn’t get a bad pump. It is pushing fuel though.
next item in line was the lift / transfer pump, same thing mounted to the block on a 5.9 Cummins but it goes on the side of the injection pump. Replaced that because I thought I was getting fuel in my oil. Making a little oil and it’s not coolant. Looked like fuel was getting past the stem. So that’s new, thought that could be sucking air making it hard to start.
Primed it up drove around truck always runs perfect once it’s going. If it sits overnight, good luck getting it to start. At this point, I’m thinking it might not be a “priming issue” although I am thinking about putting a 12v inline fuel pump on it. 8psi.
Is it bad to send 8psi to the transfer pump? Factory setup has no electronic pumps.
could something in the injection pump be faulty making it hard for us to make pop off pressure when first cranking? Granted, sometimes it fires up no issue at all as soon as it rolls over.
I don’t think it’s injector related, it runs perfect no smoke lots of power.
Appreciate any insight.