Bleeding the fuel system

[John G]

Bavaria 30 cruiser . Volvo D1-20 . I have replaced the fuel filter and primary fuel filter but am unable to bleed the system, only air coming out bleed screw after pumping for at least 30 minutes. Any help gratefully received.

[Happysailor]

Assuming there is sufficient fuel in the tank and shut off valve is open.. most logic would be the supply line to be blocked by sludge which is formed by water in the fuel. After a period of non sailing, it will settle in the tank and may block the supply line. Disconnecting at the water separator and blow it through to check. (If this is the case you will also need to clean the fuel tank...) Did you fit the right filters and fit them in the right way? Just done mine on D2-55f and took me about 30 pumps and not 30 minutes to de-airate...

[Diverphil1]

if the first filter is a cav type they can be a sod to re seal, make sure the top o ring is in its groove correctly and not twisted, then fit the filter up to the grove and seat it, then whist holding the filter in place fit the bottom bowl up to it, then finally while pushing up from the bottom re fit the center bolt. don't forget to renew the center o ring and the bolt o ring.
its a bit of a 3 handed job but practice makes it easier.

as for the other filter its just strait forward screw on type.
 
if after checking these and that the fuel tap is open then maybe your primer pump has had it. to check that remove the input pipe and put your thumb or finger over the hole to see if it is sucking anything up.