mystery vacume pump - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 07-19-2012, 08:29 PM Thread Starter
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mystery vacume pump

Does anyone know what the purpose of the small vacume pump located above the fuse box in the engine compartment? It's between the battery and firewall. When I shut the engine off with the key in the run position the pump keeps running. I disconnected the vacume line and put my finger over the vacume port and the pump shut off. Everything on the truck seems to still work. My truck is a 08 F250 6.4L CC 4x4. Thanks.

2008 SD crewcab, 4x4, Lariat, auto, 3.55 gears, rear camera, tailgate step, tan pleather, heated & memory seats, 4x4 offroad pkg, locking hubs, audiophile, camper pkg, white with gold lower two-tone.
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post #2 of 7 Old 07-20-2012, 07:51 AM Thread Starter
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The part number on the pump is 7c34-2a451-bb. When I Google the part number, all I see is that it's a vacume pump.

2008 SD crewcab, 4x4, Lariat, auto, 3.55 gears, rear camera, tailgate step, tan pleather, heated & memory seats, 4x4 offroad pkg, locking hubs, audiophile, camper pkg, white with gold lower two-tone.
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post #3 of 7 Old 07-20-2012, 08:06 AM
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I believe its a vaccum pump for the automatic hubs. If it keeps running you have a leak somewhere.

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #4 of 7 Old 07-20-2012, 10:24 AM Thread Starter
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Thanks for the info 04hdfatboy. Does anyone know where they typically leak?

2008 SD crewcab, 4x4, Lariat, auto, 3.55 gears, rear camera, tailgate step, tan pleather, heated & memory seats, 4x4 offroad pkg, locking hubs, audiophile, camper pkg, white with gold lower two-tone.
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post #5 of 7 Old 07-20-2012, 12:17 PM
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usually its the hose that runs toward the front of the truck. They tend to crack.

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #6 of 7 Old 07-20-2012, 05:00 PM
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Also the seals inside the hubs will go bad. Those get a little pricey.

Vince
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post #7 of 7 Old 07-21-2012, 12:22 PM Thread Starter
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Thanks everyone for your help so far. The vacume line between the pump the T junction was broken. The vacume line that runs on top of the radiator shroud to a relay on the passenger side does not leak but the line that runs under the degaus bottle does have a leak. Does anyone know where it goes? Is there a vacume line schmatic anywhere for a 08? Are any of the vacume lines availalbe from the dealer?

2008 SD crewcab, 4x4, Lariat, auto, 3.55 gears, rear camera, tailgate step, tan pleather, heated & memory seats, 4x4 offroad pkg, locking hubs, audiophile, camper pkg, white with gold lower two-tone.
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