Question about 1999 GMC Sonoma

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High oil pressure and severe leak

My 1999 gmc sonoma is leaking oil bad. i can see the leak but dont know what the part is. it is just to the left of the oil filter and it looks like a motor mount bolt busted and broke something off. I need to know what the part is that broke off. there is a "hole" where the oil is leaking from, but i dont know what was there. Please help
Thanks
mosleydj8

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If it is on the back of the motor then it will be the oil pressure sending unit

Posted on Feb 13, 2009

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Fuel pressure specs for gmc sonoma 4.3


2001-2004 gmc sonoma 4.3 [X, W Eng.] fuel system specs: 60-66 psi when you turn the ignition key (fuel pump) on without starting the engine. If fuel pressure drops back down quickly after fuel pump stops working (works for only 5 sec.) then you have a bad fuel pump or leaking injector spider.

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I have a 99 gmc sanoma there is a vacume leak some wears there is a vacume line running throu the driver side finder well and i dont know wear it goes


Have an assistant blow cigarette smoke in the end of the line and look for the leak under the dash,
Thinking that goes either to the brake light switch or the heater control

Sep 16, 2011 | 1999 GMC Sonoma

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I have a 2000 gmc sonoma and it look like it is leaking fron the frount left frezer plug or the water pump is there a easy way to tell if it is the pump or the plug


Yes, you can pressure test the cooling system with the engine not running to determine leaks. If you have a small inspection mirror to get in & under those tight spots it will help.

Aug 17, 2011 | 1999 GMC Sonoma

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Have a 1999 gmc sonoma, standard transmission & can not shift it into any gears @ all


check your clutch hydraulic reservoir fluid level. If empty, you have a leak. Find the leak and get back to me for repair steps.

Apr 23, 2011 | 1999 GMC Sonoma

1 Answer

Ive been smelling gas really gad. My cap is on and nothing is leaking from the tank as i can see. But when I lifted the hood I smelled the gas really bad and noticed by the back of my motor on the...


you probably have a bad o-ring on the fuel hookup to the intake/injection system. Does your engine look like the picture below? If yes, please follow instructions below the picture, and let me know if you have questions.

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Remove the plastic cover (#19), hold a rag over the valve, and push in the stem to relieve the fuel system pressure. Since you are leaking, there may not be any pressure.

Remove and discard the fuel fitting clip.


Disconnect the fuel inlet and return tube and fitting assembly. Discard the old O-rings.

To install:


Position new O-ring seals (lightly coated with clean engine oil), then connect the fuel inlet and return tube and fitting assembly.


Install a new fuel fitting clip.


Pressurize the fuel system by cycling the ignition switch ON for 2 seconds, then OFF for 10 seconds and repeating, as necessary. Once the fuel system is pressurized, check for leaks.

Dec 09, 2010 | 1997 GMC Sonoma

1 Answer

My 1999 GMC Sonoma step side 6 cylinder wont start after sitting for a while. I have to ingage the fuel pump 5-8 times before it will start. Any suggestions.


Your loosing your fuel pressure in the system when you shut down the engine. You could have a leak in your fuel pressure regulator or your return fuel line check valve is worn, which is located on your fuel pump sending unit housing. The other thing also is you could have a weak fuel pump so check your fuel pressure at the shredder valve, you should have 62-65 PSI when the fuel system is pressurized (engine not running). Causes for weak fuel pump, bad ground wire from pump to frame or worn out pump and a dirty fuel filter.
Check your fuel pressure to ensure you have 62-65 PSI and check to see how fast your pressure will drop, a fast drop will indicate a leak in your system as to the fuel pressure regulator or check valve at the sending unit.
Thank you for using Fixya and good luck

Mar 25, 2010 | 1999 GMC Sonoma

4 Answers

I have a 1994 Gmc Sonoma that overheats and i dont know why. Today, i started it up and it runs perfect. My temp. gauge doesnt move and i replaced the thermostat about a week ago. Also when i parked it...


could have a blown head gasket or cracked head or worse case scenario, a cracked block letting oil into the combustion chamber and out the exhaust. if it is letting coolant into the oil then pull the dipstick and there should be a milky white look to it where the oil tried to mix with the coolant. but its normal to have water alone drip from the drain hole in the exhaust from condesation. for every gallon of fuel your vehicle uses, it produces about a gallon of water thru the exhaust

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2 Answers

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in the low pressure charging port. its more complicated than that. why do you think it needs oil. oil is only added after a component is replaced, and the amount of oil is known. you dont want too much oil.

Oct 09, 2009 | 1999 GMC Sonoma

1 Answer

Severe oil leak and high oil pressure


Maybe the dipstick tube fell out? Unless there's a hole in the block or something.

Feb 12, 2009 | 1999 GMC Sonoma

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