You probably have either an air leak or an intermittent blockage in the fuel pickup in the tank. Pull this out and check that it still has the screen on the bottom of it - while this does not stop much from being picked up, it does tend to stop the rubbish in the tank from bunching up and blocking the end. Best replaced if possible. Worth checking how much rubbish is in the tank, and draining out as much as you can.
Also carefully check the pickup tube for pinhole air leaks. The other problem you may have is either a partly blocked line from the pickup to the pump, or an air leak along this line, but the most likely problem will be as described.
Hope this helps,
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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