Looks like crud based on last night’s investigation. The Pre-filter in the bottom of the pump housing was actually pretty clean with little sediment visible. However, I noticed an unsightly “knobble” on the side of the pump. This turned out to be some sealant used to block an unused factory hole in the pump body. However that sealant was all discoloured and swollen and when I poked at it, it disintegrated into powdery cack. Furthermore, I could see (and feel with a screwdriver through the hole) that the top half of the pump is heavily spiked with muck or oxidation. So, for whatever reason, the pump mechanism has been fouled badly. The second pic in the next post shows a little of the muck that came out banging it on the workbench.
I’ve ordered a new pump, but will see what else I can do with the old one, if I can extract the mechanism. Not looked properly if that’s possible yet.
My thinking has evolved based on suggestions above towards going to two pumps. I was going to rework the fuelling system and related wiring anyway, so this just adds a few jobs to that exercise.
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