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what is the correct color, if any, for the '40 kc 1/2ton fuel tank?.. are the mounting straps painted?.. what is the correct color for the exposed filler neck?.. thanks,  epi
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we're picking the tank up from the radiator shop today...would still appreciate some help with the coloring, if any, before we re-install... thanks, epi
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Looking at the pictures in the Engineering Features book the tank appears to be black if its mounted under the seat.
Gene Schneider
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chevgene, thanks...flat, satin, or gloss?..I'm thinking like chassis black?.. there were a few pinholes in one corner...going to have to solder fill those...am reluctant to have that sealer put in, as I don't think the tank can be boiled after having been sealed... epi
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Gene Schneider
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gene, thanks for the info... epi
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Grease Monkey
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Kepi, I got your email and will respond to it tonight. Sorry to hear about your tank but I think I can help. B
1940 Chevy 1/2 ton
1940 Chevy 3/4 ton
1940 Chevy 3/4 ton
1949 chevy 3600 daily driver
1947 GMC firetruck
1947 GMC popcorn truck
1957 BMW Isetta
1960 Nash Metropolitan
1958 Morris Minor conv.
1952 MGTD
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brian, the tank you furnished us is a beauty...we can't wait to get the kc back out on the road again after all these months... thanks again, epi
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gene, the tank we got from 49brian looks like a "plated" finish, like galvanized...do you think that this indicates that it's from a different year (later, perhaps) and that they no longer painted them?.. of course, we can spray it black so that it's correct... epi
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May be a later replacement tank or just a later tank.As long as it fits I would just paint it black.
Gene Schneider
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Not to be a pain in the keyster but I knew that the 50s tanks were terne-plated (tinned) steel. And I wondered when Chevrolet had made the change from black painted to tinned steel. I had written a post to propose that someone check truck data books or Engineering Features for several years to see when the change was made from Black to plated steel. Just as I was finishing my computer crashed (the cat ate the mouse or the mouse just went into hiding).
During the reboot I pulled the 1937 Engineering Features reprint off the shelf. I found on page 186 that the 18 gallon tank on all trucks was "...terne-plated for protection against corrosion."
Now the question is: Why are there pictures that show the tank black? I suspect to reduce glare for photos. It happened often in promotional photos where the photographer was in charge. Photos needed to be artistically correct not authentically correct. It is a hazard in relying on "factory" photos to document finishes. The candid shots of the assembly line or test track or other non-promotional photos are likely more accurate.
A second question is the same as the one in the first paragraph. When did Chevrolet change from black to plated steel? or Did they always use plated steel? Anyone want to tackle this?
How Sweet the roar of a Chevy four!
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In looking back thru my books I'm not sure how I determined that it was black.Can't find 1939-40 truck pictures to verify.First off the tank fits 1939-40 cab models.If the tank is oval with flat ends welded in its an older style tank and they were black.The newer tanks using terne-plate steel were an upper half and a matching lower half.The seam was around the tank center-horizontal.This would be the unpainted tank.Chevrolet began using the terne steel back in 1935 on the Master passenger cars.I see the same reference as Chip where the terne steel was used on trucks in 1937 but the reference I see just mentions the outside tank.Does not say what the underseat tank was made of .1942 truck Data Book lists the tank as terne-plate steel. 
Gene Schneider
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Backyard Mechanic
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Hey Kepi and others… no guarantees that this is useful information, but you might find it interesting:
I just looked at the fuel tank in my ’37 ½ ton. It appears to be plated, and does not have any significant signs of rust on the outside. The bottom of the tank is simply plated (no black paint), but the top has topcoat blue on it (no primer, no black under it). I’m guessing that this paint was applied during a repaint at some point, but the color is the same blue as the first color that was on the cab (based on the color on the firewall). The interesting thing is that there is blue paint under the curved “capture feature” at the back of the cab, indicating that the tank was removed from the cab to paint it. The really strange thing is that only the top was painted. :confused:
At any rate, I had decided that I was going to clean off the paint and leave it in it’s plated appearance.
Lenn
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gene, both the tank we replaced (leaky) and the replacement are welded all around at the horizonatl seam and appear to be newer, terne plated versions... epi
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If the newer tank still has a nice terne plate finish I would leave it as-is.If it shows signs of having been painted OR it has losts its "shine" I would paint it.Your the only one thats is ever going to see it
Gene Schneider
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gene, thanks for the advice...guess we'd like to know whether this is even the correct to original tank for this truck, as you mention an "oval" style for '39-'40... if not, we'll have to search for a correct tank... if so, we'd probably keep it in the correct finish, even though we'd be the only ones to know...one of the best aspects of this project is the resolution of all the mysteries that have been heaped upon our truck over the past six decades...the boys & I are learning a lot, and that's one the best things of all (next to driving her!)... the only item we have agreed to deliberately install counter to original specs are the www tires we put on...the boys just wanted to have a set of those, and I relented... epi
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took a closer look today...the tank's all terne-plated... except where someone had gotten blue overspray on the top from a cab interior painting, leaving four unpainted strips where the seat support bars covered the tank... epi
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anyone know if the "terne-plating" is still done today and if boiling a fuel tank at the radiator shop will strip the terne-plating off?.. epi
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Shade Tree Mechanic
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A trip to the radiator shop won't hurt the finish on the tank. I've had at least 5 of them boiled out with never a problem. The neck would be painted body color, the tank itself is the terne finish. (looks almost like galvanized) I don't know where you could go to have that finish redone, but since it's hidden under the seat, you might be able to do a satisfactory job with a spray can of some of that aluminum looking paint or something similar. The gas tanks from '39-'46 were not oval shaped, but more of a wedge shape when viewed from the side. Since it fits in the seat riser, the front of the tank is thicker than the rear.
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barry, thanks for the reply...at least we know we can boil it out without damaging the existing terne plating... btw, do you know where we could locate some correct tank straps & pads?.. epi
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Shade Tree Mechanic
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Straps wouldn't be too hard to make out of some banding and (4) fine threads bolts. Otherwise email me and I should have some. I would be thinking of using something that wouldn't hold moisture to pad the tank. Maybe tar paper strips or something similar?
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