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|Alvin Kicklighter||I have a 6320 JD with 550 hrs., fuel tank is building up excessive pressure after about 30 minutes of use, all fuel return lines are weeping, any suggestions.
|Gus||Is the vent in the fuel cap plugged?
|Alvin Kicklighter||No, I replaced the fuel cap.
|Mike||The cap should vent the air from the tank. Also excess pressure could come from bad injector seals. Put the return line into a container with the engine running, and make sure there are no bubbles.
|Hoss||I have had many 6410's do this and it was the aneroid diaphram in the injection pump with a hole in it putting boost pressure in the fuel return line. I haven't looked to see if the early 20 series had these. The later ones had an electronic inj pump and did not in which case still doesn't help you.
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