Just an update from sometime back on by 1990 240 DL Volvo. Previous threads sought out the problem of why it will just suddenly die when driving and then sometimes not start back up right away. I find now I can just let it idle in the driveway and after a few minutes it will just die. It will restart. I have cleared and checked the codes after I see it die and to best I can see, I only received code 224 on pin 6. Note that I have bypassed the temperature compensation board as my temp gauge wasn't working so that may be why I get the 224 code. Since last time to try and resolve the dying I have replaced the fuel pump with a new Bosch and put in a new main fuel pump filter, replaced the in tank pump filter and the in tank pump assembly with a used pump/assembly. It kicks on just fine so I see no problem there. I cut out and replaced the 25 amp fuse holder and fuse with new. I also checked the ground at the alternator, took it off and cleaned and reinstalled. I cleaned connections at the battery and ensure all was tight. I also tried to fix some bad wiring at the rear speedometor sensor connection and replaced the gear in the instrument panel (unrelated but speedometer worked for a few seconds and stopped and odometer didn't move so still working on this one). I had also previously replaced the fuel relay on the passenger side inside the car. End result on the dying problem is it still dies after a few minutes of running and it seems to be increasing in frequency and more easy to replicate, which is probably good as to finally finding the problem. My next step and probably the last I know to do is to replace the Crank Speed Sensor. I have wiggled it and seen nothing but I will try to check and see if bolt is tight below, then remove and reinstall, and if that doesn't work buy a used one at the junkyard or a new after market, not sure. It seems the CPS fits the profile of being a possible culprit. I appreciate all the comments and didn't mind spending the money on the new fuel pump. I've only been able to work on it sporadically and do have other cars in the interim. Most previous board comments pointed to a ground or loose connection somewhere, the 25 amp fuse and fuse holder under the hood, or the CPS. One other question. I can't tell how I can get to the back side of the fuse panel inside the car at the drivers side? I realize the car could run without these fuses but I do seem to have a couple copper pins there that seem very loose to wiggle with the touch. I don't think that's the problem. Additionally I do still need to pull back the AMM boot and check some voltages as Art had recommended. Other possibilities I guess would be the AMM and the computer itself.
Very best regards and thanks for all your previous help. Mark