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1990 7.3 injector pump problems

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1990 7.3 injector pump problems

countrycummins04 countrycummins04
User | Posts: 58 | Joined: 11/08
Posted: 01/12/09
06:10 AM

I have a 90 7.3 with 255k, i have replaced the injector pump recently and all the rubber lines on the top to the injectors. that was 5 months ago and everything worked good until now. While driving the motor jumps rpm's bqack and forth and i have hardly no power. there is a slight bit of white smoke when the trans shifts to passing gear to make it up up a hill. Sometimes when i take off and then let off the throttle the motor drops to 500rpm's and shakes like a gas motor skipping and cuts off, it cranks perfectly fine after that. then some times it runs great like theres nothing wrong. (like now) could the injector pump be bad or is it something else . I have changed all the filters to see if it could have been that. the only thing different is that i run a blend of 50/50 bio/diesel and i use sea foam cleaner every 3rd fill up  

New User | Posts: 15 | Joined: 04/09
Posted: 04/30/09
12:58 PM

clean the fuel tank out real well, change the filters and go back to normal fuel.....see if it still does it.....