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6320 JD

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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