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Message: [QUOTE="f350guy, post: 1169468, member: 11669"] Typically pumps run continually when there is a vacuum leak or filling a vacuum reservoir, I have some old Euro cars with a [B]very [/B]similar pump. The white tit is open to the atmosphere, which is normal, as the pump must be able to discharge the air is is pulling out of the vacuum system. Think of your vacuum cleaner. Before making yourself nuts, just go over all the vacuum lines by hand to see if there is a break anywhere. From what I remember Ford uses rubber hoses and plastic connectors. If you find it, cool. Mend it how you see fit and motor on... I would go with at least silicone hose and brass fittings where you can do so. If all looks fine, I would pull a vacuum at each hub with the tool and see if they lock and hold the vacuum. If not, there is your problem. If the hubs pass, work your way in reverse from them to the solenoid. From what I recall dicking with mine, the pump held vacuum at the solenoid but it was not switching which is why I had open hubs in 4hi/low. Your solenoid could easily be fine. I do not have my junk one handy but I cannot be more than a few wires. So you can check the integrity of that with the vacuum tool and jump the solenoid to see if vacuum drops once the solenoid opens. This is easier than you are thinking it is to solve. Just think if your house vacuum cleaner. :) [/QUOTE]

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