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Question about F12 fuel tank

A

arkfisher

New User
Alright guys, I've started on my F12 and I have gone through the Magneto, and the entire fuel system with exception of the tank.

There has been fuel left in it for 3-4 years and needless to say it's pretty nasty. Typically, I'll drain a tank, throw in a foot long section of logging chain and shake it around to knock the rust loose, rinse well with acetone, then red kote it.

This tank looks like it has dividers in it and I can't get the gunk out of the other sections. I can hear it rattle in there... How to go about this?

The tank is in perfect shape on the outside, no dents what so ever... It's also structurally sound, but is full of rust/gunk that needs to come out.

Thanks in advance.

Richard
 
Yes, those tanks are baffled. not much you can do except use muriatic acid to dissolve the rust, or live with it. Whether you use red kote or something similar, it [b:66756d9707][i:66756d9707]should[/i:66756d9707][/b:66756d9707] cover and seal off the loose large chunks. While absolutely not the desirable way to go, if you don't want to go the acid route, not sure you have many other options. From what I can tell, Red Kote is one of the better solvent based coatings. I prefer epoxy tank liners, but that is just my personal preference.

Others may weigh in with thoughts and ideals I have not thought of.
 
Do the chain/gravel thing to get things loose.dunp
out what will come out.Then stick an unregulated
blow gun in the filler and BLOW!Wiggle the thing,you
would be surprised how much will blow out.Then fill
with water a few times and dump out.The water will
carry out most of the rest...Then let the sediment
bowl and an inline filter catch the rest.
 
I believe the holes in the baffles are 5/8 or 3/4
in diameter. We put in some ball bearings, I
think they were 1/2 or maybe 3/8 in diameter, tied
the tank to the side of another f-12, and went for
a drive. I memory served, when we were all done,
we cam up two bearings short from the count that
went in. We would shake the tank, but never heard
anything rattle. Tank is still working today and
that was 30 years ago we cleaned it out
 
Thanks for the replies guys.

After looking closer at the junk I got out of the tank... it's solid black. I'm wondering if it's just years of gas sitting in it and varnishing up.

I'll look closer tomorrow and see the baffle holes... I didn't see any near the top, but didn't look too hard after the initial discovery.

Tom,
I've used red Kote on another tank and it worked great! I'm not sure if the curing time is different on other epoxy's, but I had to wait about 3 days before putting fuel in the tank.
 
well, one of the things you should also do is give the tank a good soak/rinse with acetone. Muriatic acid will dissolve and take care of rust, but it won't touch varnish or hardened fuel. Acetone will dissolve and remove a good bit of that.

Epoxy cures (hardens) in 2-3 hours depending upon temp. I use Caswell, but as I said, Red Kote seems to be one of the better solvent based ones out there. I personally have never used it, but that doesn't mean it's not a good product.
 
Ok guys... a little baffled here (no pun intended)

I've looked down in the tank with a good light and I see no holes in the baffles that will let fuel flow through to the outside sections of the tank. I put half a gallon of gas in and set it up on the side to let it drain through, but very little to none went through.

I wish I could get a camera in there to show you all what I'm looking at.

However, I can still hear the gunk rattling in there... On the bright side, it looks like I don't have any rust in the center section, just black varnish chunks.

I'm going to take it to the neighbors and use his steam cleaner on it then go with some acetone. I was really looking forward to the ball bearing idea, but there are no holes!

Thanks again guys,

Richard
 
Is this a dual fuel tank? In other words, it has 2 fillers? If so, that partition you see is the stating tank section and it NOT open to the main tank. if you hear rattle, then it would be in the starting portion of the tank and will NOT have any effect on the main tank.

so, how many filler necks does your tank have?
 
Tom,

It's not a dual fuel, only one opening.

I think I figured it out. On further inspection, there really is no rust, just varnished gas gunk. I took a pressure washer to the inside as best I could and it opened the approximate 1/2 inch gap at the bottom of the baffles and I've been able to get most of the junk out.
I have some acetone soaking in there right now, and hopefully will have it cleaned out completely by the time my red kote gets here this week.

In the process, however, I broke the brass fitting for the excess fuel to flow back into the tank. I didn't see any on steiners... does anyone know where I can find one?

Thanks
 
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