72 C20 "Old Mustard"

[Mustard72]

I've read not so great things about that one from LMC. It is basically a replacement tank for a Blazer/Suburban from this vintage, but requires modifying one of the bed floor support ribs to fit. Plus, they are apparently unbaffled, so the gas could slosh around and, under certain conditions, cause the sending unit suction line to not be submerged (???).

The '85 Blazer tank is also significantly larger and appears to be mountable so that you don't have to modify the bed floor rib. Although, I suppose you could just mount the LMC version lower and maybe do the same thing. Haven't researched that yet.

By the way, I was working on trailer/truck lights today out in the driveway and it was blowing, cold, and snowy again. Didn't accumulate at all, but still pretty ugly to work in. Wacky spring, dat's for sure.

[mjensen]

Let me know if you need any measurements on this tank. I think it's going to work out well. I'm going to have to look inside, but I don't think it's baffled either. The next thing I'm going to have to consider is the tank ventilation system. My original vented inside the cab...I don't think I want that setup again

[gdavis]

Originally Posted by Mustard72

I've read not so great things about that one from LMC. It is basically a replacement tank for a Blazer/Suburban from this vintage, but requires modifying one of the bed floor support ribs to fit. Plus, they are apparently unbaffled, so the gas could slosh around and, under certain conditions, cause the sending unit suction line to not be submerged (???).

The '85 Blazer tank is also significantly larger and appears to be mountable so that you don't have to modify the bed floor rib. Although, I suppose you could just mount the LMC version lower and maybe do the same thing. Haven't researched that yet.

By the way, I was working on trailer/truck lights today out in the driveway and it was blowing, cold, and snowy again. Didn't accumulate at all, but still pretty ugly to work in. Wacky spring, dat's for sure.

Thats good to know about te LMC 85 blazer tank. I was thinking about it. But I guess I better look harder in a baffle tank.

[Mustard72]

I really don't know how critical the baffling is. It's just something I read about the LMC Blazer tanks and it seemed to make sense that a baffle would be better than no baffle.

[mjensen]

I double-checked my tank, and it doesn't have the baffle in it. I'm not sure if the factory tank had them either, but for my truck I'm thinking it will be fine. It is a lifted 4wd so speed really won't be an option

[Mustard72]

I suppose if the gas got to sloshing around while you are bouncing down a trail it might be a concern, but I agree, that whole baffle idea must be for the guys making serious power that can make the gas all run to the back of the tank for more than a second or two. I'm usually baffled enough, anyways, I don't need the gas tank to be baffled, too.

[mjensen]

that makes two of us! I'm now trying to decide how I'm going to vent this bad boy. The right way is to probably run a newer charcoal canister system, but man that seams like a lot of work. Did Mustard have the canister system on it?
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[Mustard72]

Mustard hasn't had a canister since I've owned it (1986). That's basically an emissions piece, and I don't think they got put on trucks (or at least maybe the 3/4 ton and up???) by 1972.

I don't remember seeing your sending unit on your build thread. Does it have a separate vent line? I had a '69 LeSabre that just had rubber hose attached to the sending unit vent and just ran to the front of the tank behind the rear axle. I don't know if that was original or not, but that car was pretty much bone stock when I got it, and there was no sign of any charcoal canister under the hood. It also had the rear license plate fill location, which I would imagine makes venting through the cap not an option.