I was hoping that it was normal. I have ordered the 3 clear IP to secondary FF connectors with banjo fittings from the dealer. All three are hard and not clear any more. They are not leaking fuel, but I still want to replace them to continue ruling out causes for this pesky air problem. Any other places I should look? The IP pump has no visible leaks, yet somehow air is getting in there and collecting in the secondary cannister.

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327K on 1986 W201, 602.911, 722.414 2.5 190D ("The Red Baron")
139K on 1993 W124, 104.942, 722.433 2.8 300E ("Queen")

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Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.
- Albert Einstein

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