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[tomstin]

Try item 34. I had the same problem, finally found it here: https://www.realoem.com/bmw/enUS/sho...diagId=11_0119

[tomstin]

Glad you got it sorted. Wiring issues like that can be a nightmare to figure out!

[tomstin]

Does it make any difference if the fuel tank in full or low? In these old cars its not uncommon to have debris in the tank. With high volume going through the pump at highway speeds, the filter sock...

[tomstin]

The pump is probably on its way out. As it runs the resistance increases and eventually blows the fuse. You could try cleaning the contacts on the relay and fuse holder, but I doubt it will work.

[tomstin]

https://www.realoem.com/bmw/enUS/sho...diagId=13_0233

[tomstin]

If its running hot and you are loosing coolant, I would suspect your head gasket is the problem. What does the oil look like? Pull the spark plugs, what do they look like? Do a compression test....

[tomstin]

I doubt that is your running hot problem. It appears to be the drain plug as mentioned above. How much coolant are you using?