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Thread: Update on an old Burb.

  1. #21
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,694

    Default

    It isn't making sense. Seeing is believing, but I'm not seeing. Air has to come from the pump. If the pump is pushing fluid, everything is under pressure, including the return lines when they're returning. The HB unit can't "pull in" air. It can only push excess flow out the return, or to the PS gearbox. If it's foaming, it's coming from the pump, and it takes very little air to make a lot of foam. If there's air in the system, it will exit the HB unit return first. The PS gearbox return is much lower, and it will take much more volume before any air will show there. The pump is pumping air, from somewhere. Most likely a defective pump, with no evidence of a leak, anywhere.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  2. #22
    Join Date
    Jun 2000
    Location
    Morrisville, VT, USA
    Posts
    2,466

    Default

    Okay. Well, then, why doesn't it push foam out the PS return? This is why I posted the question about further testing and possibilities. IIRC (You'd think I'd know,. I was just out there this afternoon!), there's just one pressure line from the pump, which goes to the HB, then the steering gear. So, I think my next step is to lift the car, again, and try the steering, lock to lock a few times. We only tested it , running, today, with wheels on the ground and turning back and forth enough to hear the groaning. I'm inclined to think that I wasn't thorough enough.
    BTW, I already have a rebuilt pump, pump-to-HB hose, filter and fluid, so, I'm set to tackle that end, if I do prove that the pump is bad.
    Thanks for all your good input.
    2008 Jaco Seneca 35' motor home (Kodiak 5500 chassis). Pulling 18' Wells Cargo enclosed trailer, with 2016 Miata in it.

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