62 B Mack Posted June 12, 2017 Share Posted June 12, 2017 I've have 62 B61 with a END 673P. My problem is the fuel rack gets sluggish. This truck did set for 15 years not started. I bought from someone who got it started but didn't want the project. I have squirted WD 40 in the fuel inlet removed neddle and spring on the outlet to allow WD to go through work the rack by hand till it moves easy. I've had to do this 4 times in 4 years. When I start to flush it's all black coming out. What's causing this? My fuel tank is clean, fuel is clean I use fuel treatments thinking it will eventually stop doing this. Truck runs great doesn't seem to have injector or pump issues as far as running just this rack getting gummed up. Any help would be appreciated. This is my first post. Been reading posts for the last four years and learning a lot. Thanks Quote Link to comment Share on other sites More sharing options...
Ezrider Posted June 12, 2017 Share Posted June 12, 2017 black and sitting my first thought is algae second thought is the fuel line internally de-laminating but it would probably be larger flecks where algae would be more of a black slime. Quote Link to comment Share on other sites More sharing options...
62 B Mack Posted June 12, 2017 Author Share Posted June 12, 2017 I have replaced fuel line from filter to pump. Do you think algae slime would develop in a couple of months after all is clean with good fuel. ( well as clean as I can get it) Quote Link to comment Share on other sites More sharing options...
Ezrider Posted June 17, 2017 Share Posted June 17, 2017 no it probably would not have developed within a couple months, but once its in the system it can take a while to get rid of. with the line from the filters to the pump replaced im not sure where or how you would be getting anything past the filters, so i guess im stumped. you could put some biocide in the tanks and run it a while if it was algae it should clean it up. after a few tank fulls treated with the biocide. Quote Link to comment Share on other sites More sharing options...
62 B Mack Posted June 19, 2017 Author Share Posted June 19, 2017 That's what I'm thinking too. What I've decided to do is make a small temporary tank set up with new lines run it off road and see what happens. If it still does it I'm thinking seal in pump that keeps motor oil out is failing. If its good to go just gonna replace tanks and lines Quote Link to comment Share on other sites More sharing options...
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