TANK TENDER SYSTEM CHECKOUT FOR PRESSURE
LEAKS
(When gauge does not register
at correct inch level of fluid in tank)
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A leak can
occur in three places within the Tank Tender System:
- Within the instrument
panel, i.e. pump, valves, legris, gauge etc.
- Somewhere in the
1/8" nylon tubing that runs between the instrument panel and the tank
penetration fitting (TPF).
- Within
the TPF itself.
The following simple procedure will allow to quickly isolate a pressure
leak within the system:
- Instrument Panel Check-out. Remove the
1/8" nylon tubing from the Legris connector at the back of the valve
and install on end of a 1 to 2' length of 1/8" tubing into the
valve (push in firmly).Then place the free end into a bottle full of water
and pressurize the system by pushing the appropriate button and pumping
the pump to see if the pressure reading for the head of water in the
bottle holds. If the pressure holds, then the leak is elsewhere in the
system. To reconnect the tubing to the instrument panel, cut first
1/4" off tubing end, then push firmly back into the legris fitting on
the valve back. If pressure does not hold, check tightness of all fittings
and retest.
- Tubing Run From Instrument to
TPF Check out.. Remove the tubing from the legris connector at
the TPF and place in a bottle of water. Then pressurize the system as in
step a) above.If the pressure holds in the tubing run and instrument, then
leak must be in the TPF. When reconnecting the tubing run to the TPF,
remember to cut 1/4" off tubing end and push back into legris
connector firmly. If pressure does not hold, replace
instrument tubing run.
- Tank Penetration Fitting Check
out.. If leak has been isolated to the TPF, remove
from tank and check for damage to the tube or fitting.If it is just one
tank that is leaking, crosscheck that tank with a tank that is reading
accurately, i.e. disconnect both tanks tubing runs at the TPF legris
connectors, then connect the accurate tank's tubing run into the leaking
tank's TPF. Now retest that tank run at the unit. If it no longer leaks,
then leak is not in that TPF. If it does leak, then leak is in that TPF. The connection between tank and TPF should be airtight.
Notes
- The end of the nylon tube
of the TPF should be cut off 1" above the tank bottom-if the end of
the tube is jammed into the tank bottom, the instrument will not read
accurately. The TPF should be installed over the deepest part of the tank
with the tube hanging straight down to within 1" of the tank bottom. Tube
should hang straight and not be curled, bent or blocked.
- If the gauge needle does
not fall back to zero when all buttons are released or sticks at some
level above zero, then the gauge may be over presurized or has been pumped
over the red capacity line. In some cases, the gauge may be recalibrated
(call for instructions) but in more extreme cases a new gauge may be
needed. Causes of over pressurization: a) reading taken with deck fill
pipe full (extra liquid in fill pipe plus full tank may exceed gauge
capacity), b) kink or blockage in nylon tubing run between instrument and
TPF (no air can pass), c) blockage in TPF tube inside tank (no air can
pass). It is better to have excess capacity on gauge than be at full
capacity with a full tank. If a reoccuring problem, go to a larger gauge.
- If the gauge has been
disconnected from the instrument panel, a new flat gasket might be neede
at the T-fitting. If system is leaking, check this flat gasket.
- If tubing has been
disconnected from legris connectors, always cut 1/4" off of the
tubing end and push back into legris connector firmly, untill a click is
felt and heard. If nylon tubing is not completely pushed into legris
connector, the system will leak at this point.
- To test pump, cover the
open port on the valve closest to the pump and pump (one stroke). If
pessure holds at whatever level pumped to, then the pump is functioning
accurately. (There is only one open port in the valve assembly).
- If there is an existing
electrical system in the tank, remove before installing TPF.
- Fluid lying in nylon
tubing between unit and tank will cause erratic readings; taking readings
with deck fill pipe full can force fluid up into nylon tubing. Do not test
with deck pipe full. Disconnect tubing at both ends and purge line clear.
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