Not positive but think there is a pre-pump in your gas tank. I would have to look it up but you've gotta have around 40 PSI of fuel pressure for the injectors.
My S38 M5 has a pre-pump. Seems like I saw where someone was making a pump that would fit in the tank???
A great source for E24 and E28 info about very similar platforms is a site, myE28.c0m. Search there and you may find an answer.
You should be fine with running an inline pump from an e28 535i/m5. if your car is a CSI then you can buy the pump bracket from a late e12 528i which is a bolt in replacement for the csi pump bracket. The later e12 bracket will accommodate the e28 pump. this pump has the 13mm pick up and and the 7.5mm outlet. I ran this setup on my 3.8l stoker m30 with a 3 bar regulator.
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