I'm pretty sure that the air in the filter is gasoline vapors due to the
fuel lines passing next to hot engine parts, my cars will fire up and
they'd be completely full, but after a while, they would develop the air
too, that is, after the engine is hot. If you want to be able to see you
fuel but don't like the plastic ones, there is a Spectrum glass performance
filter out there in any Napa or Schucks store that is made of glass and you
can get replacement filaments (think they are about $8 for a four pack of
filaments) I'm not sure how much the filter itself costs, mine came with my
Holley kit. I love it, and the filaments can be carefully cleaned several
times, but make sure you don't have a rust fuel tank before using one of
these.
----- Original Message -----
From: Westerlund, Ken
Sent: Thursday, January 06, 2005 1:14 PM
To: 1962to1965mopars@xxxxxxxxxx
Subject: RE: Bad fuel pump?
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As I said mine did the same thing.
So I pulled the line off at the carburetor and held the end of the line
into a clear empty milk jug and had someone start the engine. The pump
was putting out a solid amount of fuel. Next, I put a fuel pressure
gage on it and it was reading about 6 psi (I think). At this point I
thought I must have a good fuel pump so I just changed the filter for
good measure and drove it. I don't know why the filter never seemed to
fill up, but I figured I had done all I could do. I used a metal filter
because I have heard some horror stories about plastic filters splitting
and allowing fuel to squirt on hot engine parts. I don't like the
plastic fuel filters (or rubber fuel lines for that matter).
Newer systems seem to have a third vapor return line on the fuel filter.
Maybe that would eliminate the air in the filter?
If you find a cure I would be interested in hearing about it, but I am
not sure it means a bad fuel pump. Test your pump output and pressure
before you spend money on a new one.