You may be right, Steve.

After several pumps&drains, I no longer had bubbles, I guess the reason may be the fuel has cooled down after several drains, it's not easy to evaporate then.

Do you happen to know how long it's supposed to hold the pressure, is 1.5 hrs from 55 PSI to 5 PSI too fast?

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99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.