74M35A2
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After 6 hours of driving, you don't need to eat/walk/take a leak?
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I don't think it will be a problem welding the two together if done professionally, which he is having done. But I would have it baffled to slow the sloshing of the fuel. One problem with such a long tank is the pickup it is going to be uncovered much worse than the stock.Or possibly a pump to transfer out of one to the other.
The one large tank made from 2: you might want to investigate the guage of the metal to see if it is think enough for such a large tank. Has anyone looked up the CFRs for fuel tanks: metal guage sizes, capacities, etc.? I would not want to see someone going down the road and loose a tank of fuel...
All 939 series trucks had stainless tanks.Don't use stainless steel on a mobile application. Stainless is one of my favorite materials, but mobile fuel tanks are typically made of softer metal so they don't crack. Stainless steel is prohibited from use in marine fuel tanks specifically for this reason. I'm not sure, but the Mack ones are likely polished aluminum.
Extending the factory tank should be ok as long as it is supported well for the weight, the same material is used, and the weld is good. Probably simplest to make one large tank out of two smaller ones, cutting at the desired width, then there is only one single seam to connect.
Hard pipe, or flexible connection?I mounted 2nd tank on other side to get 220 gals. Connected together on the bottom, feeds well and the gage works well.
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Really? Seems heavy and expensive vs aluminum. The paint is flaking off mine, maybe I'll kiss it with a grinding wheel and see if it sparks.All 939 series trucks had stainless tanks.
hyd. hose inside of alum. tube.Hard pipe, or flexible connection?
Don't do that, I have scrapped more of these than you have ever seen before. There are a few different prototypes running around that I haven't got my hands on but as far as 939 series trucks I have been in, worked on, scrapped, or towed over 2000 of them. So yeah really.Really? Seems heavy and expensive vs aluminum. The paint is flaking off mine, maybe I'll kiss it with a grinding wheel and see if it sparks.
...If possible I would mount them same height and run a good crossover tube at the bottom so they stay equalized...
I'm just going to say: AAAAHHHH!!!! This is probably illegal, vehicle classification dependent... CFR Title 49 vol5 sec393-65(d) "Gravity or syphon feed prohibited..."...Just run a connecting line between the tanks as the fuel will self level, also run a breather line between the 2 tanks so as fuel transfers itself over air can move out...
Very good advice!!!...Also I would not run a crossover or put two tanks together that's putting all your eggs in one basket, just one leak and you are done. The stock military dual tank system works well and why not use it?...
CFR Title 49 vol5 sec393-67(12)(i) The tank cannot be filled, in a normal filling operation, with a quantity of fuel that exceeds 95 percent of the tank’s liquid capacity; and...I would not do a cross over due to the possibility of overflow on the lower tank if you park on the side of a hill...
Sure, fed from the top of the tank, can't violate the 95% max fill limit, both tanks need to be vented there needs to be a roll-over cut-off on the vent....Or possibly a pump to transfer out of one to the other...
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