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Author Topic: Varnish buildup in gas tank  (Read 594 times)

alexgt350h

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Varnish buildup in gas tank
« on: March 28, 2020, 10:03:13 AM »
Have a gas tank out of a 69 that has been sitting for 10 years or so and has varnish buildup, even though tank was drained before storage. Getting lots of crap plugging up fuel filter. (yes , all lines were blown out)
Any ideas on how to clean this mess out of tank? Tank otherwise is in excellent shape, it was replaced in the early 90's.

Brent
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rhjanes

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Re: Varnish buildup in gas tank
« Reply #1 on: March 28, 2020, 10:09:04 AM »
B12 Chemtool. Put it in.  Slosh.  Let sit.  Slosh.  Etc.  Eventually dump it out and repeat as needed.  Sea-Foam should also work. 
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67 GT350

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Re: Varnish buildup in gas tank
« Reply #2 on: March 28, 2020, 11:38:06 AM »
I had a "garage find" to which the car sat from 1975 until 2012. I went through trying to save all of it from the tank to the hose that connects to the fuel pump, it was all rot free, California car to boot! I soon got tired of it and replace everything from the fuel tank to the intake! Yes, gas cap, inlet to tank, fuel sender, tank, lines to the fuel pump, fuel pump, line to the carburetor, the carburetor. Everything! Done. Then, rebuilt the engine, transmission, u-joints, rearend....Catch my drift, had to do everything.
That was in addition to brakes, etc, etc, etc. BARN FIND! HA!
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Bob Gaines

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Re: Varnish buildup in gas tank
« Reply #3 on: March 28, 2020, 11:40:22 AM »
A different story in years past and for obscure applications but what with the economical price of quality reproduction Mustang gas tanks it makes sense for many to simply exchange the gas tank. Of course you have to consider what your time is worth , cleaning materials expense and piece of mind that you got all the foreign material out given you can't see inside the tank before you decide if it makes sense for you to exchange. FYI the same steps to clean the tank are used to replace the tank so only difference is cost of tank typically.
« Last Edit: March 28, 2020, 11:41:56 AM by Bob Gaines »
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alexgt350h

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Re: Varnish buildup in gas tank
« Reply #4 on: March 28, 2020, 02:54:11 PM »
I figured that I would have to change out tank, but was hoping for a fix.
Who has good deals on 69 tanks?

Hopefully see you all in Indiana soon!

Brent
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The Going Thing

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Re: Varnish buildup in gas tank
« Reply #5 on: March 29, 2020, 01:26:14 AM »
Radiator shops can usually get them cleaned out.  Did you consider that option?
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98SVT - was 06GT

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Re: Varnish buildup in gas tank
« Reply #6 on: March 30, 2020, 04:13:08 PM »
Quote from: The Going Thing on March 29, 2020, 01:26:14 AM
Radiator shops can usually get them cleaned out.  Did you consider that option?
Old radiator shops that had big dip tank. Today all they do is replace Chinese aluminum radiators.
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The Going Thing

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Re: Varnish buildup in gas tank
« Reply #7 on: March 30, 2020, 06:06:08 PM »
Not here in the DFW area. There are still real radiator shops.
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