Duel Function Reservoir Testing (Dual Tanks)
CAUTION:
Fuel system is under pressure. Before removing any fuel lines, depressurize fuel system. Disconnect inertia switch and crank engine for a minimum of 15 seconds to depressurize system.
- Remove all lines from reservoir, note position and routing of lines and avoid fuel spillage. Apply 3-5 PSI (20.7-34.5 kPa) of air pressure to return port (small diameter tube) on engine side of reservoir (only one set of 2 ports). If air is out of only one port on the other side of reservoir, go to step 3). If air is not out of only one port on the other side of reservoir, go to next step.
- Block pressure port (large diameter tube) on engine side of the reservoir. Apply 3-5 PSI (20.7-34.5 kPa) of air to either of the pressure ports on the fuel tank side of the reservoir. Remove air and apply to return tube on engine side of reservoir as in step 1). If the pressure is out of only one return port on the other side of the reservoir, go to next step. If the air pressure is not out of only one return port on the other side of the reservoir, replace reservoir.
- Block engine pressure port of reservoir. Apply 3-5 PSI (20.7-34.5 kPa) of air to one pressure port and the corresponding return port on the fuel tank side of the reservoir. If air pressure is out of return port on engine side of reservoir, go to next step. If air pressure is not out of the return port on the engine side of reservoir, change to opposite return port and repeat this step. If reservoir fails, replace reservoir.
- Remove air from pressure port tested previously and apply air to other set of ports on reservoir. If the air pressure is out of the return port on the engine side, go to next step. If the air pressure is not out of the return port on the engine side, check connection to return port. If connection is okay, replace reservoir.
- Remove any blockage installed in the reservoir. Apply pressure to the engine side pressure port and note which port is open on the fuel tank side of the reservoir. Attach a pressure gauge (0-110 in. H2O) to the closed pressure port. Block the open port on the tank side of the reservoir. If pressure is present on the gauge, replace reservoir. If pressure is not present, go to next step.
- Remove the pressure and gauge from selected port in step 5). Attach gauge to closed return port. Apply pressure to return port on engine side and block open return port. If there is pressure on the gauge, replace the reservoir. If there is not pressure on the gauge, go reservoir is okay.