Fisherman, I'll look at my pump for that 12mm bolt when I get home. This is when I wish I had a gee-whiz digital camera. I had to figure this stuff out with a 1966 Chilton's manual and the memory of that struggle is still embarassing.

TxBill, the puff when you let off may just be leaky injectors or a bit of carbon on the valves. A few hundred more miles on clean fuel may do the trick. Are you smoking out the oil fill cap on the valve cover? Also check the slotted connector for that gorilla switch fuel shut off cable. The fuel shutoff linkage should be loosy goosy in the slot when the gorilla switch is in the run position. I'd also check the vacuum box, line, and the vacuum valve in the mixture controller. Lose vacuum control and it goes rich, as the vacuum fights with a spring inside the vacuum box.

Both of you should post your injection pump numbers. My CD shows two different pumps for your engines. Seems like either Gillybenztech or JimSmith posted nozzle pressures for somebody else - hopefully they can do the same when we know what pump we're dealing with. The 240D didn't yet exist when my tech data manual was printed, but it does show pressures for my engine.

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daBenz - 1970 220D