Vents

Overview

In current systems it only makes sense to try to keep water from entering the fuel tank via the vent. If a large amount of water accumulates in the bottom of a tank, it can eventually find its way into an engine causing damage. But small quantities of water are often tolerated. With the new regulation, steps must be taken to keep any water from getting into canisters. So the effort will have to become a more diligent, proactive one for most designers. There are three basic options available…

  1. Inverted Loops - These methodologies use gravity to help keep water from entering canisters. In their simplest form, they are a loop formed intentionally in the vent line immediately above the connection to the external vent. Gravity prevents any water entering the vent from flowing upwards and forces it back out the vent. Vents with integral 90° bends installed pointing upwards offer an easy and inexpensive way to address this issue.

  2. P-Traps - Like inverted loops, these devices use gravity, along with complex water channels, to prevent water from entering the system. Perko P-Traps are integrated with a deflector vent and offer an effective, space saving method of keeping liquid water out of canisters.

  3. Deflector Vents - These devices are essentially conventional vents with traps and a deflector plate built into them as single thru-hull devices.

All vents on this page are EPA Compliant.
  • In-line Vent Hose Surge Protector

    Perko's patent pending in-line surge protector functions both as a fill limit valve assisting in pump auto shut-off and a check valve to prevent wellback in the vent line. Consult Perko for details on how to install the surge protector as a replacement for a fill limit valve.

    Note: Must be installed with 45° of vertical if vented.

    • Black Polymer Valve
    • Aluminum Surge Float
    • Prevents fuel surges and back splash during re-fueling
    • Fits in 5/8" fuel vent hose line
    Hose Connection Length Inches Dealer Pkg. 5 Pcs. 1 per Card OEM Bulk Pkg. 25 Pcs. Carton Ship Wt. Lbs. DP/OEM Bulk
    5/8 1-9/16 0553DP0 0553000 0.8/2.0 lbs.
  • P-Trap Vent Valve

    • Allows vapor to vent from tank during thermal expansion of fuel and while refueling
    • Allows fresh airflow into the tank during thermal contraction of fuel and when engine is running
    • Protects canisters and fuel systems from water
    • Deflector style vent opening reduces water volume entering assembly
    • Internal P-Trap and check valve prevents water from passing through assembly into fuel system
    • Straight or 90° swivel hose connection
    • Black or white polymer splash guard
    OEM Bulk Pkg. 10 Pcs. Hose Connection Hose Size Splash Guard Color Max. Hull Thickness OEM Bulk Pkg. Qty. Shipping Weight
    0630004BLK Straight 5/8" Black 0 to 1" 25 10.1 lbs.
    0630004WHT Straight 5/8" White 0 to 1" 10 5.4 lbs.
  • P-Trap Vent Valve with Vacuum Pressure Relief

    • Stainless steel escutcheons, aluminum shaft & polymer body and splash guard
    • Allows vapor to vent from tank during thermal expansion of fuel and while refueling
    • Allows fresh airflow into the tank during thermal contraction of fuel and when engine is running
    • Protects canisters and fuel systems from water
    • Deflector style vent opening reduces water volume entering assembly
    • Internal P-Trap and check valve prevents water from passing through assembly into fuel system
    • Straight hose connection
    • Black or white polymer splash guard
    OEM Bulk Pkg. 10 Pcs. Hose Connection Hose Size Splash Guard Color Max. Hull Thickness OEM Bulk Pkg. Qty. Shipping Weight
    0631004BLU Straight 5/8" Black 0 to 1" 25 10.1 lbs.
  • 90° Tank Deflector Vents

    • 90° Angled Hose Adapter
    • Stainless Steel Escutcheon with Black or White Polymer Splash Guard
    • Integral Water Trap
    OEM Bulk Pkg. 50 Pcs. Color Hose Size Max. Hull Thickness Shipping Weight
    0598004BLK Black 5/8" 5/8" 14.7 lbs.
    0598004WHT White 5/8" 5/8" 14.7 lbs.
  • Straight Tank Deflector Vent

    • Straight Hose Adapter
    • Stainless Steel Escutcheon with Black or White Polymer Splash Guard
    • Integral Water Trap
    OEM Bulk Pkg. 50 Pcs. Color Hose Size Max. Hull Thickness Shipping Weight
    0597004BLK Black 5/8" 5/8" 14.0 lbs.
    0597004WHT White 5/8" 5/8" 14.0 lbs.