wingman Posted March 17, 2016 Share Posted March 17, 2016 Anyone know a easy way to turn fuel up or down in the injection pump of a 673? Quote Link to comment https://www.bigmacktrucks.com/topic/44368-turn-updown-pump/ Share on other sites More sharing options...
Freightrain Posted March 17, 2016 Share Posted March 17, 2016 Which brand of pump? Typically just a small wrench will get the job done. I did mine years ago. Once fuel got to $4/gal I rolled it back down again. It is back to 8 mpg instead of 4 mpg. She did run much better, but couldn't afford to feed it. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/44368-turn-updown-pump/#findComment-327726 Share on other sites More sharing options...
wingman Posted March 18, 2016 Author Share Posted March 18, 2016 I will have to check which pump is on it, but I thought they were all Bosch? Quote Link to comment https://www.bigmacktrucks.com/topic/44368-turn-updown-pump/#findComment-327809 Share on other sites More sharing options...
wingman Posted March 18, 2016 Author Share Posted March 18, 2016 Also Freight train, tell me how you adjusted yours? Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/44368-turn-updown-pump/#findComment-327819 Share on other sites More sharing options...
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