It is only a suggestion, my 89 740 had a strong smell of gas and it was the fuel pressure regulator dripping gas from a crack in the vacuum line. If that is not the problem, I would have the fuel pressure checked before the main fuel pump, after the main fuel pump, and from the fuel pressure reg. to the tank. You shoul find a pressure drop between those areas faster than normal, if you do, then just narrow it down from that. ie. injectors, fuel lines, bango connectors and lines to the fuel tank. The gas smell is hard to really pinpoint by just the smell, because the smell lingers everywhere.
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