TECHNICAL
BULLETIN
Rev. January 7, 2016 • TB0112-02
Models 800 and 900 Nozzle Shut-Off Feature Overview
Franklin Fueling Systems (FFS) manufactures and markets a complete line of Stage II Vapor Recovery products
globally under the Healy brand. Within the complete line of Healy products, FFS markets the Model 800 and Model
900 Onboard Refueling Vapor Recovery (ORVR) compatible stage II vacuum assist nozzles.
The nozzle models include three design features that Shut-Off the delivery of fuel flow during operation:
1. Full Tank Shut-Off feature
2. Over-Horizontal feature
3. No Pressure - No Flow Shut-Off feature.
Product Main Valve
No Pressure – No Flow Shut-Off Mechanism
Over-Horizontal Shut-Off Mechanism (800 Nozzle Only)
Vapor Collection Boot
Main Valve Engagement Lever
Full Tank Shut-Off Mechanism
Figure 1: Healy 800 / 900 Series Nozzle Cutaway
This bulletin provides an overview of how these shutoff features activate by design during normal nozzle operation
and also some reasons that they are triggered as a direct result of some abnormal fueling events.
Full Tank Shut-Off Feature
Every 800 and 900 nozzle is equipped with a Full Tank Shut-Off mechanism opening located on the underside of the
nozzle spout end. During normal nozzle operation, the Full Tank Shut-Off will automatically disengage the nozzle
main valve and stop the delivery of fuel when the vehicle tank is full. This feature prevents product from over-filling
the vehicle fill-neck and potentially spilling onto the forecourt.
Over-Horizontal Shut-Off Feature (800 nozzle only)
Model 800 nozzles are equipped with an Over-Horizontal Shut-Off mechanism that senses when the tip of the
nozzle spout is higher than the inlet of the nozzle hose. This Over-Horizontal Shut-Off mechanism will automatically
disengage the main valve and stop the delivery of fuel to prevent dispensing until the nozzle is oriented in a normal
fueling position.
No Pressure-No Flow Shut-Off Feature
Every 800 and 900 nozzle is equipped with a No Pressure – No Flow mechanism adjacent to the main valve of the
nozzle. This No Pressure – No Flow mechanism will not allow the main valve to be engaged until the dispenser is
authorized and the system is pressurized for normal operation.
TECHNICAL
BULLETIN
Rev. January 7, 2016 • TB0112-02
C
Nozzle angle over-horizontal
Normal nozzle operating angles

B
A
Page 1 of this document provided an overview of how the Model 800 or Model 900 Nozzle ShutOff features work by design, now let’s review abnormal conditions that can trigger nozzle shut-off
events and solutions to remedy them.
Abnormal Shut-Off Condition
Condition Location
Possible Condition Solutions
Product flow rates exceeding 10 gpm causing
excessive spit-back and shut-off sensitivity.
A – Full Tank Shut-Off
Mechanism
Reduce product flow rates below 10 gpm
with Flow Limiter or with Low Hold-Open
Clip position.
Debris or damage to the spout causing
increased shut-off sensitivity.
A– Full Tank Shut-Off
Mechanism
Remove debris from mechanism opening
or replace spout assembly if mechanism is
damaged.
Vehicle fill-neck configuration causing
excessive spit-back to shut-off mechanism.
A– Full Tank Shut-Off
Mechanism
B–Fill-Neck Anchor Point
Make sure nozzle is fully inserted into
vehicle fill-neck and rotate nozzle slightly
left / right or reduce product flow rate with
Low Hold-Open Clip positon.
Vehicle fill-neck configuration causing
excessive spit-back due to difficulty to anchor
nozzle.
B – Fill-Neck Anchor Point
Make sure nozzle boot / face-seal are
properly aligned and rotate nozzle slightly
left / right to achieve proper anchoring in
normal fueling orientation.
Drive-off damage to spout causing excessive
spit-back or leakage to shut-off mechanism.
A – Full Tank Shut-Off
Mechanism
C – Over-Horizontal ShutOff Mechanism
Replace spout assembly if mechanism
is rotated from bottom position or excess
product is in boot.
Franklin Fueling Systems • 3760 Marsh Rd. • Madison, WI 53718 USA
Tel: +1 608 838 8786 • 800 225 9787 • Fax: +1 608 838 6433 • www.franklinfueling.com