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Hi, today a dealer agreed to replace my GMC 2001 injectors ! I have 133k on truck ! They will begin tomorrow! I'm wondering if time has shown the new injectors to be a real improvement over the original's ! He also indicated the fuel filter needs replacing ! He said they only measured 5lb of pressure, so it must be plugged! Only has 9k on filter so I doubt it, its the new 2 micron filter! Hes doing injectors without fussing so I didnt want to beat on him about a filter and told him to go ahead! He could be right, also ! How is this fuel line pressure measured ? Did he get the number while reading the truck computer or put a guage in line somewhere for fuel pressure reading. Is the fuel pump in the tank ??? What should the correct pressure be ? I'm asking, because I want to ask him to recheck filter when all repairs are completed !!!! I want to be a bit knowledgeable when talking to service manager! Thanks for your help !!!!! Dan in sunny Minnesota !!!!
 

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The fuel is supplied to the injection pump via vacuum unless you have a lift pump installed, that is why you have to prime the system when you replace the filter. Therefore it should be reading in "/hg rather than psi, so I don't know what he is trying to tell you but...... I'd agree if your injectors are getting replaced for free I wouldn't fuss too much about a filter.

Kennedy makes a gauge you can use to monitor the life of your fuel filter, and you can see what I am talking about with the vacuum reading.
http://www.kennedydiesel.com/
 

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Mine were replaced at 136k. They seem to be quieter, but I may be basing that from the old ones they just replaced. But, my acceleration does seem to be smoother and more powerful, especially when towing.
 

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i have just under 15k on the new set of injectors, and they seem about the same, but no problems so far, i noticed that my truck does seem to smoke a little less than it did before, but this could be due to tomany different variables so i wont say it is the new injectors
 

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Sunny Minnesota? LOL Might be sunny, but that does not = warm. lol

Jon
 
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