Q500 Posted April 19, 2014 Share Posted April 19, 2014 1998 e7 high hrs but good shape. Changed number one injector to fix miss. Found unit pump is weak, found number four unit pump even weaker and miss. Took it for a short drive after replacing injector half way through drive it started blowing gray smoke at all rpms and pressurizing fuel tank with air. Sounds horrible like its way out of time. I'm stumped. Quote Link to comment https://www.bigmacktrucks.com/topic/35473-e7-fueling-problems/ Share on other sites More sharing options...
Q500 Posted April 20, 2014 Author Share Posted April 20, 2014 Another clue to the puzzle or possible more problems. Cold start it has a hard time getting fuel once it gets fuel it runs good for a couple seconds then starts smoking and banging. Kinda acts like it broke a nozzle and the unit pump just let's fuel flow through. I have no clue how its pressurizing the fuel tank? Quote Link to comment https://www.bigmacktrucks.com/topic/35473-e7-fueling-problems/#findComment-242714 Share on other sites More sharing options...
turckster Posted April 20, 2014 Share Posted April 20, 2014 Missing tip washer or improperly torqued injector is the first thing that comes to mind. Blowing compression past the injector into the fuel return. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/35473-e7-fueling-problems/#findComment-242794 Share on other sites More sharing options...
Q500 Posted April 21, 2014 Author Share Posted April 21, 2014 Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/35473-e7-fueling-problems/#findComment-242849 Share on other sites More sharing options...
Dirtymilkman Posted April 21, 2014 Share Posted April 21, 2014 Its good practice to always replace all injectors at the same time. If your new one has a higher pop off pressure than the old ones it won't run as well. Quote Link to comment https://www.bigmacktrucks.com/topic/35473-e7-fueling-problems/#findComment-242869 Share on other sites More sharing options...
gramazone Posted April 26, 2014 Share Posted April 26, 2014 check your econovance solenoid Quote Link to comment https://www.bigmacktrucks.com/topic/35473-e7-fueling-problems/#findComment-243406 Share on other sites More sharing options...
theakerstwo Posted April 26, 2014 Share Posted April 26, 2014 He did say it had unit pumps so it would not have a advance. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/35473-e7-fueling-problems/#findComment-243419 Share on other sites More sharing options...
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