I had this problem on a Vauxaul Cavilier 2.0 ltr.8 valve
The pick up pipe was jammed solid with paint that had flaked off from the inside of the sump pan (they are painted at manufacure to stop rust whilst being stored prior to fitting). I had to remove the sump,then the pick up pipe.Remove the gauze from the end and poke out then clean the pipe with petrol. It looked like Dog Muck and felt like Toffee !
When it was put back together it was fine for another 30,000 miles until the car was sold.
Good Luck.
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