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Case 1840 fuel leak. Input please.

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There's alot of things on top of the pump it could be. Can you narrow it down to governor controls or the distributor end with the 4 high pressure lines? If its running good I could only assume the fuel kill solenoid on top of the distributor head is loose or a return side leak or an air bleed. I would clean the pump with ether and compressed air till its bone dry and start it up and observe it. Its a bosch ve pump. There's plenty of descriptive pictures online so you can identify what feature is leaking.

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It might also be worth checking the seals and gaskets around the top of the pump. Sometimes they can just be worn out or not seated properly.

I've had a similar issue with my Case 1840. The problem turned out to be a small crack in the fuel line that was hard to see. Make sure to inspect all lines thoroughly.

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