I am trying to fix a downed F4 that hasnt been run in a few years. When I was draining the old gas, I noticed that the tank has rust inside of it. Does anyone know how I can flush the tank and remove the rust? I read about a product called KREEM. Does anyone have any experience with KREEM?

 

I've used KREEM before, I bought the whole kit but only used the first 2 bottles, but not the final white goop step. My gas tank turned out great, not a spot of rust in there now.

 

Thanks, I will give it a try. Any tips on using KREEM?

 

Just follow the directions that are included, and if I were you, I'd skip the actual 'KREEM' step where you coat the inside with the white goo.

 

Did you do the step where you add a peice of chain or nuts into the tank to clean out the rust? Why do u suggest not using the actual coating? Thanks

 

I read about a clever method of removing tank rust from someone on svrider. I've never tried it though.

To remove the rust, do this:

Get your battery charger. 2amp, .75amp, doesn't matter.

Drain your tank. Remove the petcock. Seal off petcock hole. Fill with water.

Add a tablespoon of WASHING SODA, not baking soda. You can find it at the grocery store.

Hang a section of bare wire into the water. MAKE SURE IT ISN'T TOUCHING THE TANK.

Attach the + side of your charger to this wire.

Attach the - side of your charger to the tank.

Electrolysis will remove the rust from the tank and deposit it on the wire in the water.

You may need to remove the wire and wipe the crud off it periodically.

The 2amp charger will do it in a couple of hours, the .75amp in a couple of days.

Best part is, unlike acid etching, it will not remove any 'good' metal.