Hi Gordon, there is a bit more about the sight gauge in the build manual
chapter
17 (Bonding Cockpit Module Into Fuselage).
On page 17-3 part way down is a paragraph titled 'Fuel Sight Gauge' and this
states
that the restrictor IS required in the sight gauge pipeline. Just to act
as a damper I should imagine.
My own sight gauge has always worked pretty well. Mine is set up exactly as per
the manual, even with the routing up the front and behind the instrument panel
- as long as one understands the readings relevant to the aircraft attitude
its ok. The only difference to standard is that I have plumbed the sight gauge
and fuel tank vents into the top of the filler cobra (XS style filler tube)
and then vented the cobra to the standard s/steel tube on the top of the
fuselage.
Sorry to ask but if you are suddenly getting these strange readings after
working
on it are you COMPLETELY sure you haven't made an error with the hose
connections?
There's quite a lot of pipes in a small space and several of them look
rather similar!
Also, on your port tank outlet does it have two separate outlets coming out of
it, one dedicated for the feed to the engine and the other dedicated to the
sight
gauge (combined with the drain if fitted)? The early version had just one
outlet to feed to the engine with the sight gauge Tee'd off and apparently with
the engine running that DID give weird readings set up like that, hence they
split the outlet into two separate outlets. (The starboard side tank outlet
should also have two ports, one for the reserve engine feed and the other for
the return line).
Another thought, could it be you have a low point in the sight gauge line
somewhere
which has got a slug of fuel trapped in it preventing pressure equalisation
to the vent thus duff readings? Blowing down the sight gauge vent might clear
this? Also is the vent to the outside correctly orientated and not subject
to some strange pressure influence that would mess up the reading?
Just random thoughts, all the best, Jon
--------
G-TERN
Classic Mono
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=441184#441184
|