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for it to read 100%. The top of the sender must be at least
¼" to ½" away from the top of the tank to allow for wall
thickness.
3. Another possibility is a tank wall thickness issue that may
occur at the corners or edges of the tank. This has not been
a common issue, and the only correction you can make is to
move the board slightly lower, away from the thick area.
What to do if sender delamination occurs:
1. We have had reports of the senders literally falling off the
tanks or showing serious delamination. This is likely caused by
a lack of tank surface preparation. Surface prep is very simple,
wipe the area to be adhered to with products like Pro Bond,
alcohol, or acetone. Do not use thinners because they leave
residues which attack the adhesive. Ambient temperatures
of less than 60°F or 15°C prevent the bonding agents in the
adhesive from working properly; use a heat gun to warm the
tank surface if necessary. Also be sure the surface is dry, again
a heat gun is the best way to dry the bonding area. Finally,
the surface of the tank must be smooth. The adhesive works
much better on smooth surfaces, if necessary use an orbital
sander with fine grit paper (220 grit) to quickly accomplish the
desired smoothness.
2. Another possibility is the wiring harness pulling on the sender.
Make sure the wiring to the tank sender is well supported so
that it does not put a load on the sender. Be sure to support
all connecting harnesses; do not let the board support the
harness, this will in time cause delamination of the board
from the tank. One simple way to do this is to use Gorilla
tape across the top of the sender at a 90 degree angle to the
sender orientation, with the wiring held in place by the tape.
The wires from the sender must be routed straight up or to
the right for reliable operation.
How to protect the sender from road spray and debris:
1. On installations where the holding tank is exposed to under
chassis road spray and flying rocks etc. we recommend the
use of an auto body undercoat, which is easily purchased in
auto parts stores. This tar based material clings well to the
senders and protects from water and debris.
2. One material in particular is 3M Professional Grade Rubberized
Undercoating, product code 03584. Another product that
works well is a Dominion Sure Seal rubberized undercoating
such as Gravel Guard Rocker Guard Coating.
Page 32
709-RVC Manual
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