- Nov 22, 2011
I just now noticed this post. If you are dumping fuel into the crankcase, the first thing I'd suspect is the diaphragm on the mechanical lift pump. This is a well-known failure point.There's a new wrinkle in the situation: When looking over the engine this morning, I discovered the oil level is way over the end of the dip stick, even though I'm almost certain it was right on the mark the last time I checked. I've read that white exhaust is associated with unburned fuel, often from bad injector(s), and this can dump enough fuel into the cylinder to get into the crankcase, diluting the oil and raising the oil level on the dipstick.
This summer I sent both injectors out to a diesel shop to be rebuilt. It was after this that I first noticed the smoke (before that I was trying to fix a very strong, almost overwhelming exhaust odor, but no visible smoke at that point). I assumed the injectors were "fixed" after the rebuild, but is it possible they were somehow rebuilt incorrectly? Or when I subsequently had the injector pump rebuilt, is it possible that the pump wasn't properly calibrated with the injectors?? Really don't know what I'm talking about here, but I'm assuming the pump and injectors have to be precisely coordinated to ensure the correct fuel mixture...??
odaydokay: Thanks for the link...a good article, exceptionally clear in listing all possible causes by smoke color. And I like the illustration of smoke color. After seeing this, my smoke is clearly white, not blue as I thought it might be.
The good news is that if that's the culprit, the fix is easy and not very expensive. Simply install an electric fuel pump wired to your ignition switch, disconnect the hoses from the lift pump, hook the hoses up to the new electric pump, and call it done. (Of course, you also will need to do an oil change--obviously.) My 1GM has such a pump (it might even be the identical pump?), and I didn't wait for the diaphragm to fail: I replaced it with an electric Facet pump. With some minor changes to the plumbing, you can also set it up to bleed your engine after filter changes with the flick of a switch. I can provide more info on that if you are interested.
Here's a discussion on the Ericson list that you might fine helpful.