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Both of your tests are valid ones, but still may not tell you if the in tank pump is faulty. I had this problem on my 84 242.
I finally did a definitive test. I pulled the pump assy. from the tank and put it in a bucket of water, activated the pump with a 12 source and got virtually no flow. You could try this too. It can be messy (put a hose on the outlet and direct away, best done outdoors).
I like to test things out before replacing parts, but the all symptoms point to bad in tank pump.
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84 242Ti IPD bars&springs, 89 745 16v M46 IPD bars, 89 744 16v M46 IPD bars, 91 245SE AW70 IPD bars, 93 245 CLassic M47
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