General Description
Agility Fuel Systems recommends that the Liquid Propane Injection® (LPI) vehicle be refilled with fuel at stations that are specifically designed for vehicle refueling. For assistance locating LPG fuel stations, contact Agility Fuel Systems, see www.agilityfuelsystems.com or at 1-949-267-7745.
The propane fuel system utilizes a closed system, with fuel supply and return lines. This requires more advanced refueling equipment due to variances in pressure. When refueling the vehicle at a station not specifically designed for dispensing propane (also referred to as autogas), the refueling process may be very slow or the tank may not fill at all. The vehicle propane tank is subjected to heat from the pavement and chassis components, which cause a normal increase in tank pressure. The station pump may not be able to produce pressure high enough to overcome that of the tank on the vehicle. It is recommended that the filling dispenser have a minimum of 90 psi (621 kPa) pump differential boost pressure over the storage tank pressure; most modern stations are designed to 130 psi (896 kPa) differential pressure. It is recommended to refuel the vehicle at a modern station to prevent any customer inconvenience.
LPI fuel tanks are equipped with both an 80% fixed liquid level gauge, and an automatic overfill protection device (OPD). The LPI system is designed to be filled reliably and safely using only the OPD. Therefore, it is not recommended to use the 80% fixed liquid level gauge unless required by the filling station attendant, or for annual OPD verification. For instructions on how to perform the annual OPD verification test, go to www.agilityfuelsystems.com.
Propane is a liquid under pressure and is stored in a pressure vessel unlike a gasoline or diesel tank. A propane tank must never be filled to more than 80% of its actual capacity, to allow room for expansion. 80% is considered "full" for all propane tanks. When the tank is filled to the correct 80% level, the fuel gauge should read full.
The following steps describe a typical refueling procedure. See Fig. for an example of the dual propane tank system.
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Front Side
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Back Side
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Bleeder Valve
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Fuel Level Gauge
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Return Valve
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Fill Valve
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Service Valve
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Pressure Relief Valve
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Access Cover and Collar