Dispenser Field Guide

1. Look at the display — is there power? Error code? Blank? Normal idle screen?
2. Look at the ground — any fuel on the pad, water pooling, staining near the base?
3. Listen — can you hear the STP running? Any humming, clicking, or cycling from the dispenser?
4. Smell — fuel odor around the dispenser or sump area?
5. Check the nozzle/hose — damaged, kinked, dripping?
6. Ask the customer/cashier — what exactly happened? One nozzle or all? When did it start?

1. Breaker — check the electrical panel. Is the breaker for that dispenser tripped? Reset once and observe.
2. E-stop — is the emergency stop engaged? Some are on the dispenser, some on the island or inside the store.
3. Disconnect / junction box — check for tripped GFCI, loose connections, or water intrusion in the junction box at the base of the dispenser.
4. Power supply board — if the dispenser has an internal power supply, check for indicator lights. No lights = no power in.

• Check the display ribbon cable / connector — loose or corroded connections are common
• Check for signs of water damage on the display or main board (corrosion, white residue, discoloration)
• On Gilbarco: check the CRIND board LED indicators
• On Wayne: check the CPU board LED status
• If the board has power but the display is blank, the display assembly or ribbon may be the issue

• Trickling (barely flows) — likely a restriction: clogged filter, stuck valve, or line issue
• Starts then stops (surging/cycling) — often a leak detector tripping, vapor lock, or STP cycling
• Flows but takes forever — could be filter, could be low line pressure, could be meter drag
• No flow at all — shear valve closed? STP not running? Solenoid not opening? Check valve stuck?

1. Filter — most common cause. Pull and inspect. If it's dark/clogged, replace it.
2. Shear valve — make sure it's fully open. Sometimes they get bumped partially closed.
3. Meter — listen for grinding or unusual noise. A seized or dragging meter restricts flow.
4. Proportional valve / blend valve — stuck closed or partially open. Check for debris.
5. Nozzle / breakaway / hose — internal obstruction, kinked hose, failed breakaway check valve.

If every fueling position on the same product is affected, the dispenser is probably not the problem.

• STP performance — is it running? What does line pressure look like?
• Line leak detector — has it tripped/restricted?
• Check valve at the STP — not holding, causing pressure bleed-back
• Actual line leak — pressure loss across all positions
• Tank level — is the tank actually low or empty?

• Under the dispenser / on the pad — check the dispenser pan (sump), fittings at the base, shear valve area
• Inside the dispenser cabinet — check all fittings, filter housing, meter connections, swivel joints
• At the nozzle / hose — nozzle drip, hose crack, breakaway leaking
• In the sump below — check sensor alarm on ATG, inspect sump physically

1. Nozzle drip — worn nozzle seal or poppet. Most common customer complaint. Replace nozzle.
2. Hose / breakaway — cracked hose, failed breakaway reconnect, swivel leak at the hose-to-nozzle connection.
3. Filter housing — loose filter cap, bad o-ring, cross-threaded housing. Check after every filter change.
4. Fitting connections — any threaded connection inside the dispenser can weep over time. Tighten or re-seal.
5. Shear valve area — check the shear valve itself and the flex connector below it.
6. Meter / valve seals — internal seals on meters and valves can fail. Usually shows as a slow weep.

• Where exactly was the leak (dispenser #, which side, which component)?
• Was it active (flowing) or residual (stain/drip)?
• What did you do to stop/contain it?
• What was repaired or replaced?
• Final status — leak stopped? Dispenser back in service?
• Before/after photos (wide shot + close-up of the source)

• "Lift nozzle" or "Select grade" — the customer may not have completed the start sequence
• "See cashier" — POS authorization issue, not a dispenser problem
• "Pump stopped" / "Time out" — authorization expired or vapor recovery issue (where applicable)
• Blank / no response — see No Display section above

Customer says "it keeps clicking off." Common causes:

1. Vehicle tank / fill pipe issue — not a dispenser problem. The customer's car is causing the nozzle to shut off (common with some vehicles). Have them try a slower flow rate or different nozzle angle.
2. Vapor recovery issue — if the site has Stage II vapor recovery, a blocked or failed vapor path can cause repeated shut-offs.
3. Nozzle venturi clogged — the sensing mechanism inside the nozzle is plugged. Replace the nozzle.
4. Low flow rate — if flow is already slow (filter, pressure), the nozzle may trip at lower volumes. Fix the flow problem first.

• Verify the POS can see the dispenser (check POS dispenser status screen)
• Verify the dispenser is authorized on the POS (not locked out or in "stop" mode)
• Try a prepay or manual authorize from the POS to test
• Check the communication cable between dispenser and POS (RS-485 or Ethernet depending on setup)
• If multiple dispensers are down on POS, the problem is likely the POS or the communication loop, not the dispensers

• Slow flow complaint — if the filter is the suspected cause
• Scheduled PM — per Petro Plus maintenance schedule
• After tank work — any time debris could have entered the line (tank cleaning, drop tube work, STP replacement)
• Visual inspection — dark, saturated, or showing water means replace

1. Cone off the fueling position — no customers during filter work
2. Close the shear valve at the base of the dispenser to isolate the line
3. Relieve pressure — briefly lift the nozzle to bleed pressure, then hang up
4. Place rags/drip pan under the filter housing — fuel will drain when you open it
5. Remove old filter — note the condition (clean, dirty, water, debris)
6. Inspect the housing and o-ring — replace the o-ring if worn, cracked, or missing
7. Install new filter — correct size/type for that dispenser. Seat it properly.
8. Hand-tighten the housing — snug, not over-torqued. Check for leaks.
9. Open the shear valve — let the system re-pressurize
10. Check for leaks — visually inspect the filter housing and all connections
11. Test dispense — run fuel to verify flow and check for leaks under pressure
12. Clean up — remove rags, dispose of old filter properly, clean any fuel from the cabinet

• Dark / black — normal wear if it's been a long time since replacement. Heavy dirt = possible tank contamination.
• Water present — water in the line. Check the tank water level on the ATG. May need tank water removal.
• Rust / metal particles — corrosion in the tank or piping. Document and escalate.
• Clean (but slow flow reported) — filter is not the problem. Look at meter, valve, or line pressure.

• Breaker tripped — check and reset once. If it trips again, investigate.
• Loose connections — corrosion, burned terminals, loose wire nuts in the junction box
• Water intrusion — moisture in the junction box, conduit, or on boards (look for corrosion/green residue)
• Burned components — scorch marks, melted plastic, burned smell on boards or wiring
• LED indicators on boards — learn what normal looks like so you recognize abnormal

• If you're not trained on electrical, don't guess
• Identify the symptom, document what you see, and escalate to someone qualified
• Never bypass safety devices (fuses, breakers, interlocks)
• If a breaker keeps tripping, there is a reason — find it, don't just keep resetting
• Water + electricity = stop work. Dry it out or escalate.

• Steady green — normal operation
• Blinking green — communicating / dispensing
• Red / amber — fault condition. Note the pattern (steady vs blinking, how many blinks).
• No LEDs — no power to the board. Check power supply, connections, and breaker.

• Filter housing leak — o-ring condition, housing tightness
• Pulser failure — dispenser runs but doesn't register volume. Check pulser wiring and connection to meter.
• Blend valve stuck — wrong product dispensed or no flow on one grade. Inspect valve solenoid and mechanical movement.
• Display issues — ribbon cable connection to CRIND. Reseat before replacing.
• Communication loss — CRIND to POS. Check RS-485 wiring, address settings.

• LED patterns vary by model — learn the normal state for the sites you service
• No LEDs = no power. Check supply, breaker, junction box.
• Error LEDs = note the color and pattern, document with a photo.
• Wayne diagnostics can sometimes be accessed via the display menu (model-dependent).

• Solenoid valve failure — no flow or constant flow on one product. Check valve coil and wiring.
• Filter / spin-on leak — same as Gilbarco: o-ring, tightness, correct filter for the model.
• Meter issues — grinding, inaccuracy, or no-count. Inspect and replace if needed.
• Display / keypad — unresponsive buttons, partial display. Check connections before replacing.
• Communication — Wayne uses different protocols (DART, WDART, etc.). Check cabling and configuration.

Shares many codes with the 500s. Listed below are codes specific to or commonly referenced on the 700s.