Retail · Distribution
Stage I Vapor Recovery
The connections that send gasoline vapors from the station tank back into the delivery truck while it unloads, instead of venting them to air.
What it does
As fuel drops into the tank it pushes vapors out. With the vapor hose connected they travel back into the truck and on to the terminal, where they are recovered or burned. Dual point systems use separate fill and vapor openings; coaxial systems use one opening with two paths. Vent pipes carry pressure vacuum caps.
Basics
| Types | Dual point or coaxial |
| Vapor goes to | Truck, then terminal |
| Vent cap | Pressure vacuum valve |
| Unload with | Two hoses, submerged fill tube |
Common failures
- Vapor hose not connected, so vapors vent at the station during the drop
Troubleshooting
- Symptom
- Strong gasoline smell at the vent during deliveries
- Likely cause
- Vapor return not connected or vent cap stuck open
- What to check
- Check driver procedure and replace the pressure vacuum cap