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Tractor Talk Discussion Board

Re: black goo in the bottom of a diesel fuel tank


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Posted by Tirebiter on October 17, 2019 at 10:17:51 from (73.249.58.112):

In Reply to: black goo in the bottom of a diesel fuel tank posted by tirebiter on October 13, 2019 at 17:14:07:

After about 40 minutes I put an extra blob of black goo/tar into the ACETONE. A little while later I added some to the LACQUER THINNER. Then I added pieces of the papertowel I was using to wipe off the large flat screwdriver to the ALCOHOL, ACETONE and LACQUER THINNER.

The next day I saw a film being left by the LACQUER THINNER. No film depositing from the ACETONE. Neither solvent had dissolved all of the tar off of the paper towel but it's interesting to note, the LACQUER THINNER turned the paper towel darker.

The ALCOHOL seemed to be a distant 3rd behind (1) ACETONE and (2) LACQUER THINNER. GASOLINE and XYLENE barely did anything to dissolve the DIESEL tar in 24 hours of soaking.

I poured the rest of the gallon of LACQUER THINNER into the diesel fuel tank and let it sit overnight. I'll see what it looks like later today. Then, after draining it, I plan to do a rinse with the ACETONE and drain. To be followed up with a dilute solution of muriatic acid as needed.

I put the two blackened samples of thinner and acetone together and put the shutoff valve and a few other fittings into it. The stuff still wrinkled up the paint within minutes. It wire brushed off 100% with ease.

I noticed the water trap is cracked and has rubber plug inside that had become brittle and was falling apart. Do there water traps usually remain on the tank and get drained regularly ? Or is it supposed to be removable for service.

There seems to be some solder around the water trap flange that does not look as though the factory did it. The external water trap is centered at the rear of the tank bottom.

The fuel strainer that I took out of the filler opening on top could use some a new mesh. There are several pinholes and a few small tears in the mesh. Is there an easy solution for this ?




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