Hi all,
84 van with inline motor...

Everything else is Vanagon stock...

  My fuel pump has been getting noisier lately...over the last month or so.
  I finally got home to my tools and floor jacks so today I went after that
looming problem...

  I took my pump out and both my filters...I have one full flow Triumph
motor cycle filter pre-pump and the standard large vangon can filter
after...
  So I am going to run my fuel pump backwards on my bench to see what
squirts out but in the mean time I put some compressed air into the outlet
line from the tank...the supply to the pump..so I could clear the crud from
my in-tank screen...I have done this one other time...

  Here's the question:  When I took the supply  line from the tank to the
pump off before I put the compressed air (50psi) backwards into the fuel
tank, the gas flow out of the disconnected hose was very
free-flowing....and now I get barely a dribble out when I unplug that
hose...When I put the air into the  hose, I took the gas cap off and I
could hear the air going into the tank...lots of bubbling noises...   I'm
thinking I should see a free flow again from the hose that goes to the
pump, the outlet from the gas tank....but it is only a little trickle....Is
that the way it's supposed to be?  Should I see a strong flow out of the
unpluged line to the pump from the tank?  The gas cap is still off, the van
is raised a bit on the passenger side, there is appx 1/3 tank of fuel
aboard...

  What say the fuel tank experts.?