Might be you need to change your pre-filter and main filter, when is the last time the filters were changed? It is possible that the primer pump has begun leaking, they will pull air into the line when that happens, the promer pump can be had through FastLane and PartsShop for a song.

__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.