Fuel Lines

The fuel system uses three different fuel line types (not including the fill line). The type used is dependent upon the pressure the fuel line type is designed to handle.

High Pressure Line
The high pressure line is stainless steel tubing with matching high pressure O-ring face seal (ORFS) fittings. The individual tubes are pre-formed with fittings installed. All O-ring face seal fittings use nitrile rubber O-rings that are specific for gaseous fuel operation. These O-rings must be replaced with the correct replacement part whenever a line is opened. When installing NPT (pipe thread) fittings DO NOT use Teflon tape. Tape fragments could lodge in a regulator and allow fuel pressure to exceed specified levels. The use of pipe sealant with Teflon� is required.

Intermediate Pressure Fuel Hose
The intermediate pressure fuel hose assembly is a unique two-piece solid stainless steel line with a flexible line for connection at the Low Pressure Regulator (LPR) that is designed to isolate alternative fuels components from vibration.

Low Pressure Hose
Low pressure gas is supplied from the LPR to the fuel mixer with Gann(R) VH-100 vapor hose. This hose is a patented non-permeable hose.

All hose, lines and fittings must be replaced ONLY with the correct replacement GMSPO part number.