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GMC Yukon Questions

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Left work truck was fine stopped at store came out started it up and I lost powersteering and brakes are hard. Thats when i seen the return hose to the gear box was off. I replaced the power steering pump and the Hyrdro-Boost. Tried to bleed the hydro-boost but nothing comes from the return hose. I believe there is high pressure on both sides of gear box not allowing flow or there is blockage in line or a seal has failed somwhere. Please help.
I turn the selector to either 4 auto, 4 hi, or 4 lo. The indicator light will continually flash and I hear a click like the transfer case is shifting but will not actually engage. I have tried in park, in neutral, slowly rolling and even at moderate speed (30mph).
car is off. Is there some button or something that will turn them off when the car is not running? Of course the battery goes dead. Not sure of the year, can't find any papers or manual for this car in the glove department.
I had my oil changed and now the engine knocks?? The oil level is good, but the noise just started. Could it be the lifter? And what will happen to the engine if I drive like this?
Not getting proper signal from ckp.removed it and found engine oil on magnet.is normal
Trying to remove to replace got in fender bender and have leak needing to remove
I have a 2008 GMC YUKON SLT 4WD V8. I am having trouble with my fuel gauge. It will say I have 1/2 a tank then I can drive just a few miles and it sais empty. For example I had 123 miles left till empty last night. Today it sais 34 miles and the low fuel light is on. I don't know what to do. My husband and I just bought this car 8 months ago
I've tried everything. Checked the fuel pump, spark plugs, and carburetor. When I try to crank it it tries to turn over but can't quite make it. Any suggestion on what to try would be great. Thank you.
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