Del Sol L4-1.5L SOHC (1993)
Two-Way Valve: Testing and Inspection
1. Remove the Fuel Tank Filler Cap.
2. Remove vapor line from the Fuel Tank and connect a vacuum/pressure gauge and pump via a T-fitting.
Two-valve Testing
3. Apply vacuum slowly and continuously while watching the gauge.
Vacuum should stabilize momentarily at 5 to 15 mm Hg (0.2 to 0.6 in.Hg).
If vacuum stabilizes (valve opens) below 5 mm Hg (0.2 in.Hg) or above 15 mm Hg (0.6 in.Hg), install new valve and retest.
4. Move vacuum pump hose from vacuum to pressure side.
Two-way Valve Testing
5. Slowly pressurize the vapor line while watching the gauge.
Pressure should momentarily stabilize (valve opens) at 10 to 35 mm Hg (0.4 to 1.4 in.Hg).
If pressure stabilizes below 10 mm Hg (0.4 in.Hg) or above 35 mm Hg (1.4 in.Hg), install new valve and retest.
