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I am experiencing a similar situation with my '89 740. I believe that my problem is related to the pre-pump assembly that is mounted in the gas tank. Over the past few months I noticed that it took longer to start the car when my fuel tank was near 1/4 full or lower. (Typically after the car had been sitting overnight or during the day for 10 hours. (Temperature did not have a big affect on this.) Many posts, here on the brickboard, mention this fuel pre-pump as a reason for this hard starting condition. I had my mechanic replace this pre-pump about a month ago, but when he installed it he noticed that the new pump was not turning on when it should. He suspects an electrical connection problem with the assembly that the pump is attached to - it includes the float for the fuel gauge and a sock type filter. He didn't repair or replace the other parts of this assembly because they cost around $300. He wanted me to try it without the pre-pump working and see if gas would flow through the new pre-pump easier. There is a primary fuel pump located under the car near the driver seat location. He thought that my primany fuel pump was strong enough to handle all the pumping action. The fuel filter is next to the primary pump. You might try having a new fuel filter installed if you have not had that done recently and see if that helps. I replaced my fuel filter about 6 months ago but it didn't help my problem. I have now decided that I probably need to get this whole pre-pump assembly working since my starting problems with a low fuel level have continued and actually seem to be a little worse. Recently, I've tried to not to let my gas gauge go below 1/3 full. I'm not sure why this problem might be worse when it is hot, unless it has something to do with increased evaporation. Did you ever notice a similar, but less severe problem during cooler weather when your gas tank was less than 1/4 full? (I assume that your 1990 has the same system as my '89.)
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