95 6.5 TD new injectors - now low mpg

[Steak&Eggs]

Wow, thats an Idea! I suppose I also could disconnect one line off the engine and route that to a fast acting gauge and get it all set up proper...

BUT. I am retired on the family farm - I'm pressed for time! I have so many machines to keep running and fence to fix with buildings to upgrade and replace (and to do that I have to cut the trees and use the sawmill to turn them into lumber) and I know I probably will have to leave a lot of it to the kids! ;-). Plus experience is a big help - someone that does it every day will pump out a tiny job like this without breaking a sweat!

I do like doing it all myself but sometimes it just makes sense to take it to a pro! (If one can be found).

I did find a couple videos of the original injectors before I replaced the nozzle and pintle, listed below.

http://lglackin.com/1995GMCk3500TD/German1.mp4

http://lglackin.com/1995GMCk3500TD/german4.mp4

So thanks for all the help! I will let you know what happens, (it might be a while) I have to confirm they will do it and then I have to take the injectors out. Joy!

Larry

 

[dbrannon79]

I would not do that on a running engine! taking another IP and doing that in a controlled environment is much safer! I can't remember but I think some john deere tractors use a similar DB2 IP but is setup for a 4 cylinder engine. really any IP that produces those pressures and can be rigged up to push fuel without any electronics, just by spinning it fast enough!

looking at those two, the spray pattern looks good and pressures are about normal for a well used injector!

My theory is the slightly lower pressure has something to do with the mileage increase. slightly earlier detonation. they spray ever so slightly early and also spray less fuel resulting in a cleaner burn. but there is or would be a limit to that as too low of a pressure and you get the hard starts and whatnot. To me it makes sense with an engine that has a worn timing chain even if you change the timing a tad! I have not explored this yet on my truck, it's simply a lot of work to pull injectors in and out changing their pressures along with the time it takes for me to do my mileage! LOL it takes me about a month to use up a tank of fuel as much as I drive HAHA.

 

[ak diesel driver]

Actually lower pressure can increase the volume of fuel moved via a longer duration.