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Don't bother trying to remove the WIF sensor
If you CAN get it out after a long in-service period, likely the thing will be too corroded for re-use. They are not that terribly expensive.
You CAN get it out of the manifold cover without pulling the pump or manifold.
If I could make a suggestion here though. If there's goop that high up in the HFCM, you might be further ahead to pull the pump right off the frame and pull the entire HFCM cover off and see what kind of sludge buildup is in the housing itself. You might be surprised (read: disgusted) at what you find.
If this were my truck, that is the way I would tackle the repair.
I would buy the fuel line disconnect set, personally. You'll need it down the road sometime. As for the fuel leakage concern, I would do this at a shop that has compressed air. Remove the filler cap, and remove the two lines (pump inlet and tank return) from the rearmost side of the HFCM. Force some compressed air down those lines to break the siphoning effect that will be present. Once you've got that done, you should be able to work relatively fuel-shower free. You are still going to get drainage from the engine side but it will be minimal.
As stated before, you might be further ahead to pull the whole pump and business off of there and clean out the goop inside. Also pull your secondary filter cap and filter and look in there for any sediment/water intrusion.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
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