OP
@bazzer avatar
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Enthusiast
Vespa Sprint
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Location: South Africa
 
Enthusiast
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Vespa Sprint
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UTC quote
Hi Guys,

I've read a bit, not much though, and watched a few videos on youtube about using Molasses, anybody else got some advice on how to clean up an old fuel tank without damaging it.
@joshzingzing avatar
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Veni, Vidi, Posti
px200 cutdown,px180,px150. Puch SR. Puch scooterette
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Veni, Vidi, Posti
@joshzingzing avatar
px200 cutdown,px180,px150. Puch SR. Puch scooterette
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UTC quote
lots of nuts and bolts and shaking




molasses sounds like a really bad idea to me, sugar plus heat n end up with a toffee cylinder etc
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nothing at all
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nothing at all
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If its just crappy ole fuel and sludge than simple green and good strong spray nozzle.

If its got some rust then throw some gravel or nuts and bolts or a 1'4 pound of some roofing nails in there with some simple green and shake that fucker around for a while.

If its bad do the same thing twice.
@1978p200 avatar
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Hooked
p200
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Location: Tujunga, Southern Cali..
 
Hooked
@1978p200 avatar
p200
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Location: Tujunga, Southern Cali..
UTC quote
Drain cleaner will work. ONE 1/2 once PER TANK FILL WITH WATER KEEP COOL...I just don't know what you have down there to use.. I use toilet bowl cleaner or drain cleaner "acid" in my tanks.. works great..
Just let it set for two days then.. Drain 75% out and use the nut and bolt method.. "OPEN SLOWLY TO LET THE PRESSURE OUT" then flush with water... cut some two stroke oil down with gas and add right after the flush to stop flash rusting..and then your good..
UTC

Lurker
56/57/58? wide frame Allstate
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Location: San Francisco, CA USA
 
Lurker
56/57/58? wide frame Allstate
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Location: San Francisco, CA USA
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For just plain rust I've had good results from molasses- the chemistry is some kind of chelation. I've used a 10% molasses and water solution, and left the parts in for a month. Here's how a 120 year bicycle chain turned out:
http://s53.photobucket.com/user/gormanao/media/Cushion%20Tire%20Safety/molasseschain.jpg.html
There are a lot of witch doctor derusting schemes. This worked for me.
@bigben avatar
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Evil
p2, jet2, lml166
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Location: Philadelphia, United States
 
Evil
@bigben avatar
p2, jet2, lml166
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UTC quote
joshzingzing wrote:
lots of nuts and bolts and shaking

yup, nuts and mineral spirits is my trick.
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Hooked
Rally180
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Location: Newport Beach, California
 
Hooked
Rally180
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Location: Newport Beach, California
UTC quote
There is a toilet bowl cleaner called "Works" for sale for $2 at Ace hardware that you just pour in and fill the tank with water. After 10-15 minutes pour it out and the tank is bright and shiney inside. Quickly coat the inside of the tank with a gas/oil combination and away you go....
@joshzingzing avatar
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Veni, Vidi, Posti
px200 cutdown,px180,px150. Puch SR. Puch scooterette
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@joshzingzing avatar
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UTC quote
pebbleworm wrote:
For just plain rust I've had good results from molasses- the chemistry is some kind of chelation. I've used a 10% molasses and water solution, and left the parts in for a month. Here's how a 120 year bicycle chain turned out:
http://s53.photobucket.com/user/gormanao/media/Cushion%20Tire%20Safety/molasseschain.jpg.html
There are a lot of witch doctor derusting schemes. This worked for me.
looks like it works well !!, i only put it on yoghurt or porridge cheers




still i have memories of the old trick. cup of sugar in the fuel tank of someone you hate
@alanmac avatar
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Molto Verboso
'74 Rally, '72 Sprint
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Molto Verboso
@alanmac avatar
'74 Rally, '72 Sprint
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UTC quote
bigben wrote:
yup, nuts and mineral spirits is my trick.
Better you than me. My nuts ain't going near any mineral spirit.
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Molto Verboso
Black 2007 PX200, Dark green 1986 PX225 Pinasco, "1972"(yeah rite) Tangerine px200, several TRIUMPH TIGRESS SCOOTERS
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Molto Verboso
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UTC quote
how much rust is inside? are we talking scale flakes or just surface?

If its just surface, then a shake with nuts, bolts, nails and 100+mls of crc for 10 minutes may do it.
But if its flaking scale, use nuts bolts nails and zinc phosphate acid. Shake for about 10 minutes, let it sit for 20 then flip it and do the other side. Rinse with water, you may need to repeat it a few times. Use a blow dryer to dry it out. Then squirt a heap of crc in there to keep it from corroding.

You can tie it to a clothes line through the bolt holes with the tap and cap plugged up and just spin it round. Works heaps easier than shaking the damn thing.
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Veni, Vidi, Posti
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Veni, Vidi, Posti
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If you have rust and some scale , put some nuts, bolts, clean small gravel, etc in the tank, tape up the openings, wrap up in an old towel or blanket and run it thru a cycle in the clothes dryer - no heat of course. Just make sure your lovely lady is not home at the time, too many questions - not enough lies. Good Luck
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bodgemaster
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
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bodgemaster
@socalguy avatar
63 GL, 76 Super (x2), 74 Primavera (x2), 79 P200, 06 Fly 150
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UTC quote
A 10:1 water/molasses solution actually will work. It creates an acetic acid that dissolves rust. But it's a slow process. There are at least half a dozen relatively inexpensive products that remove and inhibit rust and do it much faster and more effectively using phosphoric acid solutions.

Ospho, Fast Etch, Krud Kutter's Must for Rust, even good old Naval Jelly will all deoxidize the inside of your tank and coat it in much less than a month.
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Addicted
1961 vbb and 1981 p125x
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Addicted
1961 vbb and 1981 p125x
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I've used molasses and it hasn't taken a month. It is pretty slow thou. Toilet cleaner does work well. I shy away from putting nuts and bolts inside as sometimes a rusty tank isnt just rusty but also thin. I have rinsed with diesel fuel but premixed should do the same.
@lango avatar
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Hooked
62 VBB 64 GL Rally 200s 74s-76-77 P200s 79-82
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Hooked
@lango avatar
62 VBB 64 GL Rally 200s 74s-76-77 P200s 79-82
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UTC quote
I used acetone and my tank looks awesome
I just cleaned the tank on the rally - it was parked for 34 years. I was told to use acetone and a chain - and I used gravel instead. Medium sized gravel. I let it soak a while. Be careful the acetone will destroy paint and the knob on the fuel cap if allowed to soak. I wiped off any drips and my paint is fine.
@rob98801 avatar
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Addicted
85 Vepsa PX150E with sidecar, 80 P200 with sidecar, 96 Goldwing with Hannigan Sidecar, LR87aj5, LR91aj3
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@rob98801 avatar
85 Vepsa PX150E with sidecar, 80 P200 with sidecar, 96 Goldwing with Hannigan Sidecar, LR87aj5, LR91aj3
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UTC quote
I bought a paint shaker from Harbor Freight a few years back. I now put it to good use cleaning out tanks. A cup of 1/4 nuts and 30 minutes later the inside of the tank is spotless.
@v_oodoo avatar
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Style Maven
'74 50s x3 '87 PK125XL '92 PK50XLS Plurimatic - & - '58 AllState '68 Sprint '66(?) Super125 and '72 DanMotor Super150
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@v_oodoo avatar
'74 50s x3 '87 PK125XL '92 PK50XLS Plurimatic - & - '58 AllState '68 Sprint '66(?) Super125 and '72 DanMotor Super150
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Paint shaker? Just suspend from bungees & use kidpower.

External inline image provided by member with no explanatory text
@vader19 avatar
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Mr. Clean
P,SUPER,V90, 50 Special
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Mr. Clean
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V oodoo wrote:
Paint shaker? use kid power
Is that legal?
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nothing at all
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nothing at all
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Vader19 wrote:
V oodoo wrote:
Paint shaker? use kid power
Is that legal?
That's exactly what kids were invented for.
@v_oodoo avatar
UTC

Style Maven
'74 50s x3 '87 PK125XL '92 PK50XLS Plurimatic - & - '58 AllState '68 Sprint '66(?) Super125 and '72 DanMotor Super150
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@v_oodoo avatar
'74 50s x3 '87 PK125XL '92 PK50XLS Plurimatic - & - '58 AllState '68 Sprint '66(?) Super125 and '72 DanMotor Super150
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UTC quote
^^^ correct

plus they earned 5 euro each for both putting in multihours of shaking.
@blacky avatar
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Enthusiast
VBB
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Location: West Australia
 
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@blacky avatar
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UTC quote
I use the gravel method , then wrap the tank in a towel and put it in the cement mixer for a couple of hours.
@joshzingzing avatar
UTC

Veni, Vidi, Posti
px200 cutdown,px180,px150. Puch SR. Puch scooterette
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Location: west aus
 
Veni, Vidi, Posti
@joshzingzing avatar
px200 cutdown,px180,px150. Puch SR. Puch scooterette
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Location: west aus
UTC quote
blacky wrote:
I use the gravel method , then wrap the tank in a towel and put it in the cement mixer for a couple of hours.
hillbilly gravel ?
@blacky avatar
UTC

Enthusiast
VBB
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Location: West Australia
 
Enthusiast
@blacky avatar
VBB
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Location: West Australia
UTC quote
joshzingzing wrote:
blacky wrote:
I use the gravel method , then wrap the tank in a towel and put it in the cement mixer for a couple of hours.
hillbilly gravel ?
Of course !!!
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