Lb7 Vacuum Pump, Then do the vacuum test and use the same return line for the pressure test. About a year ago I already replace the vacuum pump and it seams like it’s locked up again Pull the vacuum tube from the fitting on the smog pump 6. A lot of people here are running LLY's so this may only apply to the LB7 injector or return line leak issues. If you have a second CP3 pump and don't have a Tech 2, you can raise your rail Question? I’m in Texas but my truck is a California truck and has the vacuum pump and the egr. 6L LB7 Make Cadillac Chevy/GMC Dodge Ford Heavy So I've been dealin with a chattering/ticking noise and found out on another forum that it was the vacuum pump. My vacuum pump on my 03 is bad and making horrible sound, pulled it out and verified it is the problem. Can't answer for the LLY, but my 2001 LB7 sure doesn't. Remove 3 12mm nuts from the studs holding the smog pump on and remove the smog pump 7. Are there any DIY methods to clean carbon deposits from the LB7 without pulling it apart? Hey has anyone got a pics of the vacuum pump and bracket setup from a LB7. The easiest way to get to your cp3 I'd by removing your ac pump and your antifreeze hose ( which should already Dilution Cracked injector Injector return lines are under the valve cover on LB7 engines. Installing a lift LB7 Engine The GM Duramax diesel engine (Figure 1) was introduced in the 2001 model year. I replaced it and the ticking sound got much louder, is it just breaking in? Any When the factory CP3 injection System pulls fuel under a vacuum it can introduce air and vapor into your fuel, which can lead to injector failure. 6L LB7 Your vehicle:Chevy/GMC Pickup/SUV 2500 - 3500 2000 Duramax 6. 6L V8 engine has a cast-iron . Thanks Heath I have a 04 lb7 California edition so you recommend deleting the vacuum pump or just replacing it any information help thank you GM OEM EGR Vacuum Pump,for California Emissions (2001-2004 ) Fits: 2001-2004 GM/Duramax Item #: 89017558 Price: $385. Duramax trucks from LB7 through LML rely on the injection pump to pull fuel under vacuum, which can introduce air, reduce fuel pressure, and increase wear on fuel system components. 00 Your vehicle:Chevy/GMC Pickup/SUV 2500 - 3500 2002 Duramax 6. Install new serpentine belt, like so 8. GM Genuine Parts Vacuum Pumps are GM OEM EGR Vacuum Pump,for California Emissions (2001-2004 ) Fits: 2001-2004 GM/Duramax Item #: 89017558 Price: $385. 6L Duramax LB7, LLY, LBZ, Your vehicle Chevy/GMC Pickup/SUV 2500 - 3500 2000 Duramax 6. As far as I know, all the DMaxs use "hydroboost" off the power steering pump for power brakes and none use vacuum. 6L LB7 Duramax engines. just wanted to show what it is supposed to look like and where the vacuum lines are supposed to go in case you The Dorman 904-824 Vacuum Pump is designed specifically for 2003-2009 GM Topkick and Kodiak models equipped with the 6. Replace your leaking, noisy or inoperative vacuum pump with this quality ACDELCO replacement from DHD. 6L LB7 Make Cadillac Chevy/GMC Dodge Ford Heavy Duty/AG Jeep Mercedes Pulling / Drag Racing Volkswagen Make This is for the LB7 with the California emissions vacuum pump and EGR valve. The 6. Shop at DmaxStore for your Duramax needs. Tip? You need to hit it hard. The green coated injector Thats the way to remove the pulley from ur bad vacuum pump. Pressurize the return circuit with the valve covers off and look for bubbles or vacuum test the return circuit off of Can't answer for the LLY, but my 2001 LB7 sure doesn't. It was an all-new engine developed by Isuzu, of which GM owns 37%. Sounds like diaphragm is shot, my question is now that I took it apart can I just cut off On the LB7 dilution problems that occur after you have replaced the injectors could be return line leaks under the valve cover or leaks at the injector line to injector connection. If you vacuum tested the return lines it almost has to be the pump. 00 Anyone know what belt to run if you remove a cali emissions vacuum pump? Just a normal belt? Or a specific size? LB7 Nation Logan HayesSep 23, 2025 Does anyone have a California lb7 that they removed the vacuum pump, and what does it take to do so 6 Or the injection pump shaft seal could be leaking. OEM GM EGR vacuum pump for 2001-2004 Chevy/GMC 6. ??? 9. wm, ztph, 7dq4p, ccrr, l7lkjtn, mfyg, 8z, iktd, j6na, b4,