Posted by jdemaris on February 01, 2010 at 14:05:39 from (67.142.130.23):
In Reply to: 84-6.2 chev farm truck posted by fordman6442 on February 01, 2010 at 13:15:23:
I'm not sure I fully understand. Once it's running and warmed up is it OK?
The most common problem with any CK 80s diesel truck is getting a rust hole in the fuel somewhere between the fuel pump and the fuel tank. Since the fuel pump sucks fuel from the tank, once you get a hole somewhere, you don't get a fuel leak. It just sucks air, and won't start or run right.
Best way to diagnose IF you think you're sucking air is to hook up a gravity feed fuel source directly to the filter-housing. An outboard motor fuel tanks works great. Hook up the gravity tank, get it bled and started. If it runs fine then shut if of and retry later. If still find - then you can assume you've got a rust pinhole somewhere in the rear fuel line or fuel pickup. It's happened to every 80s GM diesel truck I own.
No, if you are sure you do NOT have a rust-hole problem, how about your pump? All the pump used on 6.2s were doomed to failure until they got updated in 1985. Since your's is an 84, I'm going to assume it already failed and was updated - but who knows? If it was NOT updated, it has the same plastic ring inside the pump that fails on many Deere AC, IH, Case, and Ford farm tractors. If it has failed, it will keep starting and then dying, over and over.
If you've ruled out all that, GM and the US Military also came out with another update kit to prevent the pump from getting air-bound and losing its prime - especially after being parked over night. The fix is a new regulator check/valve on top of the injection pump (cost $7), and a new stype fuel pump with better one-way check valves.
As far as the glow plugs and how long? What plugs did you install? Hopefull the German Beru plugs that Delco reboxes and sells as AC60Gs. They take longer to heat then the old ones, and need a good 12 seconds minimum to heat up. The older plugs took 9 seconds - and if you went longer they burnt up and blew up (junk).
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