On Wednesday, March 8, 2017 at 3:37:17 PM UTC, DerbyBorn wrote:
........there is
a partial blockage where the pipe connects to the manifold. I am

I have had the same problem a couple of times in the past and cured it using an air compressor with car tyre adaptor. Didn't need to get out my big compressor - a cheap Lidl combined jump starter/compressor was all that was required.

CRB