Checking Danfoss is oil pump is working

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Did you have any joy pal?
I have the exact same problem.
Building work, new slim tank and pipe. Oil gets to burner pump and fizzes out the bleed screw when opened, bit doesn't come out the nozzle pipe valve (unscrewed it to check)
Seems to be bled fine, with decent oil supply, simply not passing through to the nozzle pipe. And worst of all, its the exact same with a brand new danfoss bfp 41 L3 pump fitted this morning. 2 local heating engineers have tried and left scratching their heads now.
HELP!!!
Oh, also, it doesn't even lock out, just keeps running till I switch off the Spur.
 
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Take the nozzle out and start it just poking into the combustion chamber see if it squirts any oil out. Bob
 
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