1991 740 non turbo regina fuel system approx. 200k miles. This morning I repositioned my car for a car wash. She sure is pretty , when cleaned , wheels all shiny , just looking great. So an hour after the fact, it was time to run errands. It started then quit after 10 seconds. WTH I thought. So my diagnostics are as follows. Swapped relays still no start. I can hear the only intank fuel pump priming even before that. Removed oil cap check before and after position of cam lobe....timing belt good. Removed coil from amplifier . Resistances appear acceptable .Cleaned all contacts there and tightened all bolts for good ground. At this point I am awaiting a fiend to come by so I can do a crank to see if there are sparks at the plug. Checked for resistance at the rpm sensor. I got like 190ohms there. There are three tabs one is a shield. I take it crank sensor is good. I had changed that a while back.
So now I am thinking what is it I did differently while washing my car and here it is . I opened the fuel door , not remove fuel cap.. ..I wouldn't do that! , and usually it is black and gooey , so I soaped up the area with the rag and then washed away all the suds while by spraying in the area....NOW is it remotely possible for water to get by the cap gasket and into the fuel tank? My aviation experience tells that the water would be at the lowest part of the tank where the fuel pump is and so I am pumping water into the system?...I wonder
I there a fuel tank bung?