Black Fuel in filter

[kcbbqguru]

My 85 1009 was running rough, then would run fine, decided to change out fuel filter, when I took off the old one, the fuel that came out was black as old used oil. Is this normal? does anyone think I should maybe run all the fuel out and check it again? or maybe change the filter set up to a spin on? thanks

 

[txmytx_catahoula]

I know we've seen that in the bottom of our bulk tanks when water and algae are present. A little HEET and algecide(sp?) and it will clear out. That black stuff will take out the newer diesel IPs, not sure how it will affect these older ones.

 

[southdave]

are sure you are not making oil or fuel.. ie motor oil getting into fuel system via fuel pump??

 

[doghead]

are sure you are not making oil or fuel.. ie motor oil getting into fuel system via fuel pump??

Never seen oil get into the fuel, with a bad pump. Just the other way around.

 

[pctrans]

Pretty sure it's algae. Most truck parts stores have an additive. Then add some off-road diesel.

 

[bigjuice69]

i agree it's algae, my buddy got some bad fuel with it in for his semi he went thur over a dozen fuel filters before his truck ran good agian.

 

[maccus]

It is algae. You need to take care of the problem before it causes you some big trouble.

 

[wayne pick]

u got bugs, Actually Cyanobacteria, they actually eat diesel fuel. I would drain the tank and change the filter. Add 5gal of fuel to the tank and treat with Racor diesel biocide. RACADT2116 16oz treats 1600gal. If you don't drain the tank and Don't kill all the algae it will be an ongoing problem as they multiply rapidly. You could go through literally hundreds of gal of fuel before you kill all the algae. Keep treating untill you finish the bottle of biocide. Change your fuel sorce as you might be odopting someone elses bugs.

 

[quickfarms]

Having a radiator shop clean the tank is a good idea

 

[swbradley1]

After they clean it ask them to re-coat it with the interior "paint" as well.