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To solve this problem remove the tank and have it cleaned and checked at a radiator shop. Install an inline filter before the fuel pump to protect it. When the tank is out you can check the fuel sending unit and fix it if necessary.
This is a bit shadetree, but I was working on an '88 BMW that someone had left the fuel pump out and the tank open to the elements for a year, there was literally an inch of varnish in the bottom of the tank, and no commonly available replacement. The radiator shop wanted $400 to boil the tank.
After removing the tank, I bought a gallon of B12 Chemtool from the auto parts store, and a toilet brush. I told my wife (it was her car) that everytime she left for work and came home, just take the brush, stick it in the fuel pump hole, and in the filler tank hole, and scrub it for a minute as well as she could.
Everytime I went to work, I did the same, and also lifted the tank side to side to slosh the cleaner back and forth (it was a baffled tank)
After a week of this, I poured it off into an oil catch, and looked inside the tank to see my reflection in the bottom of it.
I don't remember precisely how I did the lines to the engine, but I seem to remember pouring some of the cleaner in the engine side, letting it sit and blowing it through with air (while the tank was off). After putting it back together it ran beautifully for 3 or 4 years until we got rid of it.
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