Supermutt Posted July 13, 2023 Share Posted July 13, 2023 hello, I don’t mean any disrespect to anyone on the site. I am looking for a resident wizard on the E7 350 mechanical fuel system. I have read countless posts on here but they do not get into the specifics of fuel settings etc and many have a lot of folks chiming in with their two cents but actually have very little experience with this specific fuel system. Any help would be greatly appreciated ! thanks Quote Link to comment Share on other sites More sharing options...
Mackpro Posted July 13, 2023 Share Posted July 13, 2023 What settings you needing info on ? Robert Bosch pump I assume? Quote Link to comment Share on other sites More sharing options...
Supermutt Posted July 13, 2023 Author Share Posted July 13, 2023 Turn up or move fuel plate forward. The pump must be American Bosch. It’s a 1996. It must be a P7100 identical to Cummins 12v. Quote Link to comment Share on other sites More sharing options...
Mackpro Posted July 13, 2023 Share Posted July 13, 2023 It would be a Robert Bosch pump of that era. The easiest way to tell is where you screw your injector line on. The Robert Bosch pump has a extremely fine spline barrel nut that takes a special socket to remove the barrel and replace pump washers. The American Bosch pump was way more low profile where the injector lines screwed on. The fine tuning of the pumps were not done at the dealerships. This was a pump shop type of repair/adjustment. However like some people said I remember removing the top cover marking the position of the sliding rail with a punch and moving it forward and test driving. I’ll see if I have any information on it in my old manuals at work 1 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted July 13, 2023 Share Posted July 13, 2023 (edited) Here a pretty good video if you got time to kill. The John Deer pumps were pretty close to the Mack pumps Edited July 13, 2023 by Mackpro 1 Quote Link to comment Share on other sites More sharing options...
doubleclutchinweasel Posted July 13, 2023 Share Posted July 13, 2023 You've got one of the best in the business helping you there, 'Mutt! 2 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment Share on other sites More sharing options...
Mackpro Posted July 13, 2023 Share Posted July 13, 2023 Proper pump timing is crucial for best performance. Using a Kent Moore A-B light , set the pump timing 1 degree higher than what the tag on the valve cover . Never more than 1.5 degrees or overheating will probably happen. We rarely ever messed with the pump . Good injectors, turbo, valves adjusted correctly, throttle linkage and kill cable adjusted correctly and the pump timing bumped up usually made a big improvement in power. 1 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Joey Mack Posted July 13, 2023 Popular Post Share Posted July 13, 2023 This is the timing tool for the Robert Bosch injection pump.. I swear by it.. Jojo 1 2 Quote Link to comment Share on other sites More sharing options...
Supermutt Posted July 14, 2023 Author Share Posted July 14, 2023 Joey I sent you a message. I will have to pick up that timing tool. Quote Link to comment Share on other sites More sharing options...
BOBWhite Posted July 14, 2023 Share Posted July 14, 2023 Not really about tuning up but it helped me understand the timing process. Tuning these Macks is kind of a tricky deal, throwing more fuel at it won't do you much good. Mack spent a lot more timing tuning these engines to be used in trucks than anyone else, so anything you modify will likely just throw everything else off balance. Best of luck! 1 1 Quote Link to comment Share on other sites More sharing options...
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