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I have been burning waste oils on a Chevy van with a 6.2L in it. I found the biggest problem was the Stanadyne DB-2 IP. It was designed with several silicon seals. Silicon seals tend to swell if alcohol is in the blend over 3%, and the even swell badly with xylene above 5%. Note: Xylene is...

An update here. The rebuilding of the DB2 injector pumps turned out to be a massive amount of work, for no useable results. I suspect that by the time one of these IPs fail, its hydraulic head is worn out, and will not make pop pressure, so I will not be doing it again.

At the end of yesterday I succeeded in removing the hydraulic heads and drive shafts off of 4 of my dead DB2 IPs. They were glued on with high melting point esters (fat), so it required heat+diesel fuel+ultrasonic cleaner+pulling hard+wiggling+twisting to get them off. There were 2 broken drive...

After making more progress with rebuilding 4 dead DB2 IPs using the TM 9-2815-237-34, Section 2-32, I will have up update my comment here, because I found the Factory Service Manual, posted above, was a useful addition to the TM. I still have not gotten the hydraulic head or drive shafts...

I downloaded this manual elsewhere. I found it is an incomplete manual that describes an old version of the DB2 IP, and is not complete enough to dismantle a more recent model of the DB2.