Factory Five Racing GTM Supercar Assembly Manual page 432

The next way to verify the year of fuel system is to look at the fuel rails on the motor. The first generation
fuel line routing has 2 ports on the fuel rails, one feed and one return. The second generation has a single
feed on the fuel rails and no return (the fuel filter has a return port to the tanks).
1997-1998 Feed/return style fuel rails
1999-2004 Feed port only on fuel rail
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