Some of you might remember that I put my fuel tanks in
a couple of months ago. Thought I should be O.K.
The tanks were in excellent shape, replaced all hoses,
clamps etc. Neither sending units were functioning so
they were replaced with new ones from Golbys.
New GM rubber O rings were used and new GM lock rings.
>
Completed this work almost 2 months ago and when I fueled
up gas was obviously spilling onto the ground from the
top of the rear tank.
>
Today I pulled the offending tank. I found a trail of dust
that clearly showed that the leak was from the sending
unit. When I removed the sending unit it was clear that
the O ring had not sealed, although the O ring was well
centered. These O rings with the tabs to hold them
centered are nice.
>
Had given up finding the problem (I hate that when I
give up and start to put something back together without
finding the source of the problem).
>
During reassembly I found that the sending unit could
shift off center. Compared the new sending unit to the
GM version. The GM version uses a light steel sheet
(about 16 gauge) to seal against the tank. This sheet
has a ring formed that looks like it would be good at
preventing the O ring from shifting. The Golby unit uses
a thicker steel plate (about 12 gauge or 1/8" thick) to
seal against the tank. It has no formed ring. Therefore
the O ring only has the formed depression in the tank
to help it stay centered.
>
No problem with the O ring. It had stayed centered.
The problem was with the sending unit. It didn't have
to stay centered. The formed ring on the GM sending unit
would have not only kept the O ring from shifting,
but would have also served to keep the sending unit
centered.
>
Once the Golby sending unit was installed using special
care to keep it centered. I plugged all the lines and tested
the seal with the tank upside down and some gas in it.
>
No leak!
>
Put the tank back in and filled the tanks as full as possible.
>
No leak!
>
Success at last! It only took me 2 months
>
Arch if I remember correctly you used the Golbys sending
units as well. If you haven't found your problem I suggest
you might want to check this out.
>
Anyhow with the fuel tank problem behind me, (before noon ! )
I was able to move onto more mission critical issues like
installing the light in the fridge
. Got to be able to get a beer
after dark without waking my son
=
>
PS - As a side issue, if the land speed record team needs
a fuel tank re and re man for the pit crew I think should apply.
It doesn't take me long to do this anymore!
>
PPS - Another side issue. I took the drive to gas up today.
Haven't driven the old girl in close to 2 months. I have to make
a point of driving the coach at least once a month. The enjoyment
of using it exceeds any bad feeling I might get when something
does not go as planned the first time.
>
Regards
>
>
Gary Zingle
1973 GMC 26 foot
Enjoying another beautiful day in Edmonton
a couple of months ago. Thought I should be O.K.
The tanks were in excellent shape, replaced all hoses,
clamps etc. Neither sending units were functioning so
they were replaced with new ones from Golbys.
New GM rubber O rings were used and new GM lock rings.
>
Completed this work almost 2 months ago and when I fueled
up gas was obviously spilling onto the ground from the
top of the rear tank.
>
Today I pulled the offending tank. I found a trail of dust
that clearly showed that the leak was from the sending
unit. When I removed the sending unit it was clear that
the O ring had not sealed, although the O ring was well
centered. These O rings with the tabs to hold them
centered are nice.
>
Had given up finding the problem (I hate that when I
give up and start to put something back together without
finding the source of the problem).
>
During reassembly I found that the sending unit could
shift off center. Compared the new sending unit to the
GM version. The GM version uses a light steel sheet
(about 16 gauge) to seal against the tank. This sheet
has a ring formed that looks like it would be good at
preventing the O ring from shifting. The Golby unit uses
a thicker steel plate (about 12 gauge or 1/8" thick) to
seal against the tank. It has no formed ring. Therefore
the O ring only has the formed depression in the tank
to help it stay centered.
>
No problem with the O ring. It had stayed centered.
The problem was with the sending unit. It didn't have
to stay centered. The formed ring on the GM sending unit
would have not only kept the O ring from shifting,
but would have also served to keep the sending unit
centered.
>
Once the Golby sending unit was installed using special
care to keep it centered. I plugged all the lines and tested
the seal with the tank upside down and some gas in it.
>
No leak!
>
Put the tank back in and filled the tanks as full as possible.
>
No leak!
>
Success at last! It only took me 2 months
>
Arch if I remember correctly you used the Golbys sending
units as well. If you haven't found your problem I suggest
you might want to check this out.
>
Anyhow with the fuel tank problem behind me, (before noon ! )
I was able to move onto more mission critical issues like
installing the light in the fridge
after dark without waking my son
>
PS - As a side issue, if the land speed record team needs
a fuel tank re and re man for the pit crew I think should apply.
It doesn't take me long to do this anymore!
>
PPS - Another side issue. I took the drive to gas up today.
Haven't driven the old girl in close to 2 months. I have to make
a point of driving the coach at least once a month. The enjoyment
of using it exceeds any bad feeling I might get when something
does not go as planned the first time.
>
Regards
>
>
Gary Zingle
1973 GMC 26 foot
Enjoying another beautiful day in Edmonton