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Old 11-29-2009, 10:14 PM   #1 (permalink)
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Power Steering Leak -- Help!

1991 W250. I've replaced the power steering pump, the pressure and return lines, and the steering box, and it still leaks! The best I can tell, it's coming out the top of the reservoir filler cap. Occasionally, when I shut down the truck, foamy power steering fluid pukes under pressure out of the reservoir. Other times, it just leaks. It's not overfilled and will continue to leak until the power steering fluid runs nearly out and I have to add more. I was thinking of drilling a hole in the cap and running a vent line to a catch bottle. Anybody have this power steering problem? If so, what'd you do to fix it? I'm running out of ideas.
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Old 11-29-2009, 10:27 PM   #2 (permalink)
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Weird

I personally have never had that problem.

Have you tried different make/model power steering fluid? I believe power stearing is the same as hydraulic fluid ... ???
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Old 11-29-2009, 10:29 PM   #3 (permalink)
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Is the pump getting hot at all? You may have a blockage somewhere in the high pressure path and thats causing your reservoir to be pressurized and spewing fluid out of it.
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Old 11-29-2009, 10:32 PM   #4 (permalink)
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Quote:
Originally Posted by richard.bessey View Post
I personally have never had that problem.

Have you tried different make/model power steering fluid? I believe power stearing is the same as hydraulic fluid ... ???
No, I haven't. Just NAPA power steering fluid.
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Old 11-29-2009, 10:34 PM   #5 (permalink)
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Is the pump getting hot at all? You may have a blockage somewhere in the high pressure path and thats causing your reservoir to be pressurized and spewing fluid out of it.
No, the pump isn't running hot. If there is a blockage, I have no idea where it'd be. The entire system is new. And the power steering works fine (until it runs out of fluid).
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Old 11-30-2009, 11:25 AM   #6 (permalink)
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I'd go with the catch bottle idea until the solution presents itself. I really hate leaks under my truck, a left-over attitude from having been a junk driver all my life, ... until now, where what I have is old but not junk, and no leaks! ...
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Old 11-30-2009, 06:08 PM   #7 (permalink)
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I had that problem with my truck. The way I fixed It was, start the truck, take the cap off the resevoir, have someone work the stearing back and fourth as you add fluied. that should flush all the air out of the system. It worked for me, hope it works for you.
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Old 12-02-2009, 09:22 PM   #8 (permalink)
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I am having the exact same problem with mine. It is a 91 as well. Also having a vacuum issue (lack of vacuum). Brakes a little unresponsive as well. The brake pedal was stiff but the new booster softened it up (still slow to grab). I still have no vacuum. Wonder if the PS,PB, & lack of vacuum are related?
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Old 12-04-2009, 09:20 AM   #9 (permalink)
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Problem Solved!

The pump reservoir was cracked. The defective pump was still under warranty. Replaced it yesterday and no leak so far. Used a different power steering fluid (Lucas) too which hopefully will reduce oil foaming and spewing out the cap.
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Old 12-12-2009, 11:43 AM   #10 (permalink)
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Since you've just been through this, how in the world does the PS pump come off of the vaccum pump? I took the vaccum pump off, and have them on the bench, but I cant get them apart.
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Old 12-12-2009, 04:26 PM   #11 (permalink)
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Since you've just been through this, how in the world does the PS pump come off of the vaccum pump? I took the vaccum pump off, and have them on the bench, but I cant get them apart.
Four studs/nuts attach the ps pump to the vacuum pump. Remove them and the two parts separate.
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Old 12-14-2009, 08:37 PM   #12 (permalink)
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Yea, I got the four studs part whipped (although mine were bolts), but its the "two parts seperate" bit I cant master. So yours just fall apart? I cant PRY them apart! the housings seperate about a quarter-inch, but the drive gear and shaft from the vac pump wont let go of the PS pump.
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