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/// There is a small section of hose connecting the intank pump to its output line. This is the most likey failure given your milage. Since the pump runs with this failure you cannot change the output or test the pump by cutting off the juice to the pump. If this tube is the problem the gas intake for the main pump will now be several inches above the gas tank bottom. When the hose rots to the point of falling off the intank pump is no longer in the circuit. The gas supply will run out when the tank level drops below this point. Partial failure of the gas tube will complicate your diagnosis since some gas may be pumped even though the tube is damaged. Using a large container you can check the output from the tank. Remove the input line to the main pump and splice enough line to get you above the tank gas level. Test the intank pump. Gas will siphon when you disconnect the line until the gas level drops so the test must be above the tank level.
Siphon the tank down below the red line on the gas gauge before you begin. This method is safer and will eliminate the need to get above the tank level to test the pump.
Access is standard from a hatch in the trunk or under the rear deck. A wide blade such as a small garden hoe will remove the lock ring on the tank. There is usually a compression fitting in the return line above the axle so you do not have to cut it. Blow the area out with WD40 before you begin.
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