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yukon

7790 diesel

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CarlH
Which pump is leaking? Injection pump or lift pump? I've not found any kits for the lift pump, your least cost solution is to remove it block off the holes and install an electric fuel pump. If it's the injection pump, it might be a previous owner has replaced the internal O-rings with the wrong size. It might also be leaking banjo fittings - you can cut off the crimped clamps, install new hose, and use regular clamps.

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427435
If the leak is coming from the top of the injection pump, it's probably the small 0-ring that is on the top of the fuel line coupling. Or it's the copper washer under the coupling. Do a search on 7790 and there is a lot or reading-----one of them shows a picture of the fuel pump and likely leak points.

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