SVO 300TD dies while at idle in loop mode

Hello
I have single tank conversion that dies at idle in loop mode but runs fine when under acceleration.
After it dies I have to switch the valve to return and purge the system of what seems to be air then I'm fine until the next time I let it warm up at idle. It doesn't have this problem when the valve is on return. I thought it might be a filter issue but I have no loss of power when going down the road.
Thank you this forum has been a big help.
Rob

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