Part of the problem might be because the vent tube is pointing
forward into the slipstream. Since it is meant to be just a vent, you
could try a straight vertical tube with a couple of saw cuts on the
back side, or bend the front of the tube down into an inverted "J",
so it doesn't get pressurized by ram air.
As Wayne suggests, you might want to check to see that you are
getting enough air INTO the tanks from the caps. I drilled 1/8" holes
at the front AND back of the filler neck, above the bottom of the
cap, so rain wouldn't get in, but lots of air could ! Lack of sufficient
air through the caps is the reason for the cross tube & vent in the
first place .... (At least enough air must enter to replace the volume
of fuel used.)
.......bobp
------------------------------orig.------------------------------------
At 07:10 AM 9/1/01 -0700, you wrote:
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Wayne, is there a way to redo the vent. Mine is cross vented and if I blow
into the hole the fuel gets blown out of the sight guages, so when I get low
it shows no fuel in the tanks. I have already put a restrictor in the BOTTOM
el of the sight guages and was wondering if there was something else I could
do to stop the pressure on the guage...Thanks....Brian
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Brian, Stop flying with less than 5 gallons of fuel in each tank! Then you
will not get as nervous!!!
Seriously, you must have the site gauge in MAM's newer (ridiculous)
straight
up/down position on the front end of the fuel tank. I know this without
asking first, as 5 gallons US just wets the bottom of the tank at the
filler
neck in the 3 point position, and even on amphibs the dip stick doesn't
change that much. You need the lower fitting, for the tube style sight
gauge, to be as far back on the tank as possible if you want it to be of
any
use. I'm not interested in seeing max fuel, but I sure want to know when
I'm
getting low!!! On any that I have been "refurbing", which includes removing
the sight gauge from the tee at the fuel outlet (as the original MAM
installation does draw air into the fuel line!!), I have been installing a
new tank fitting about 1 3/4" forward of the original outlet fitting. Only
drill a small hole at the lower edge of where the tank fitting will sit.
This gives you an automatic restricter hole to stop the sloshing around on
the sight tubes. Also this way you are only drilling about 6 #30 holes in
the finished tank so aluminum chips shouldn't be a problem in the tank. You
may be able to do this with the wings installed using an angle drill and a
hand riveter. The other possible cause, if you have the sight tube on a
slant like I have described, is I have seen installations where the tubing
from the tank through the fuselage root ran up hill. You need to make sure
that the tube is coming though level or downhill from the tank into the
cabin to show a fairly accurate amount at low fuel levels otherwise the
tube
just drains back downhill into the tank when low on fuel.
Regards,
Wayne G. O'Shea
www.irishfield.on.ca
----- Original Message -----
From: "brian amendala" <solongez@hotmail.com>
To: <murphy-rebel@dcsol.com>
Sent: Thursday, August 23, 2001 7:22 PM
Subject: Re: Paddle Holder
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toWayne, can you please tell me how to fix my sight guAGES? I have put a
restrictor in the bottom el of the tube and it's better, but when I getlikeabout 5 gals a side the gas dissappears from the guages and it looks
Iminuteshave no fuel. Is there A fix to keep the guages more accurate?
Thanks....Brian
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