I have a spare 7.3 IP, Stanadyne DB2831-5070. Can I use it on my 86 6.9 w/turbo?

 

That pump is calibrated for a turboed engine if I remember right, but it will fit the 6.9.

 

My 6.9 has a 7.3 pump on it. Fits right in!

 

Yes. The pumps are all basically the same. Calibrations might be slightly different for different years, and I guess automatics might have something different in the external linkage that can be swapped over.
Somewhere around 92.5 they added the torque screw on the back of the pump, but from what I understand, its mostly an emissions thing to limit the black smoke at low RPMs, while still providing sufficient fuel at high RPMs. Torque screw pumps are compatible for earlier engines (7.3 or 6.9) and non-torque screw pumps can be used on the later engines.

 

I am running a DB2 5070 on my 86 turbo.

 

i have the same on my truck, it was rebuilt by dieselogic so they use a different number system but it is a 5070 equiv. made for the 93-94 idi's. It is just the fuel setting and as mentioned above torque screw. With your turbo it will be a great pump to have!

 

Good, that will save me a couple $$$. Thanks for the info.