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The CAT dealer wanted Chris to talk to CAT engineering to see if that would work or what he would have to do. The 3126 uses the round top HEUI pump and I'm thinking the only difference would be the fitting at the pump and possibly the fitting location relative to the block port. The block port...

Yeah - one of these days I should make a complete post on that. I've posted it in other threads, but not made a post about the process. I should have taken more pics but I was pretty flustered about the compressor failure and just wanted to get my new toy back together (compressor blew up during...

It's certainly worth a look under there with it running since it costs nothing. I would also be very curious to look at the scope traces of the IACV. And to inspect the inside of the HEUI oil supply hose - being that hose is 23 years old - if those have a propensity to shed inner lining that...

Don't believe there are any lines except the single line from the pump to the head. All the injectors are fed oil through drilled passages in the cylinder head I'm pretty sure. I didn't notice any lines when I changed my injector wiring harness anyway......

This guy mentions that the factory feed line going into the HEUI pump was found to shed rubber internally into the pump:

We can put an oscilloscope on the control wires to the IACV and compare to the percentage listed in CAT ET and see if the signal is stable or dropping out, etc. That would be very straightforward with my PICO Scope. Same for the pressure sensor. Conceptually it's possible for the ECM driver to...

The supply filter comes with the HEUI pump and injector kit for the C7. Indeed I had to scour the Internet just to find the part numbers to install the filter kit on my C7 because CAT doesn't sell a "kit" for just the filter if you want to install it preventatively - probably because...

As to the filter - it's a filter for the HEUI pump oil *supply* and the official CAT setup is only for the C7. They did not create one that I'm aware of for the 3126. There is an aftermarket supplier that makes a filter that goes between the pump and the injectors which prevents a HEUI pump...

Well damn. Adept Ape mentions them jumping around like that and says that means the HEUI pump is going. You could send out an oil analysis sample and try to read those tea leaves. I wouldn't screw around at this point. I would get a HEUI pump and injector kit from CAT. As much as that...