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Never filled it up empty so just how many gallons in a 37 p/u tank.
VCCA #45194
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The "book" says 18 gallons.
Gene Schneider
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The 1937 Truck owners manual says 16 gallons for 1/2 ton trucks and 18 gallons for the larger 1 1/2 ton models.
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The Master Parts Catalog (1941 version) says they use the same tank. HMMMM.
Mike
ml.russell1936@gmail.com
Many miles of happy motoring
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Looks like I will have to run it out of gas and then fill it up,I think its smaller then 18 gallons.
VCCA #45194
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1937 Engineering Features says "Eighteen gallon tank in 1/2 ton cabs and All 1 1/2 ton trucks. Sixteen gallon tank in half ton panel type trucks"....
Gene Schneider
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Is it possible that information was erroneously held over from '36, when the pickup tank was at the rear of the frame and the big truck tank was under the seat?
Mike
ml.russell1936@gmail.com
Many miles of happy motoring
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Gene is correct in his reference to the Engineering Specs. There does seem to be a discrepancy between that reference and the 1937 Trucks Owners Manual as referenced above. The owners manual does not offer any distinction between models other than the weight cited above. I don't recall running the tank on Old Blue to dry and then filling it so, my records won't shed any light on this either.
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From the 1948 parts book
part # 594782 1936 low roof cab and 1937 GC GD GE & S cabs 18 gal
Part #3657515 1937-1946 panels 1/2 ton 15 gallons
Gene Schneider
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The published info seems to get even more confusing?
The gas gauge on my truck has always been suspect, so long ago I made a "dip stick" to cross check the gauge reading with the stick. Over the years and as part of the pre-drive checklist inspection, the stick is used to check gas level in the tank. Note: the tank on these trucks is under the seat. To fill with gas, and do the check referenced, the passenger side, lower seat cushion is removed. The then exposed filler cap is removed for access to the fuel fill port.
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My gas gauge does not work right and I think its the sending unit.
VCCA #45194
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I found more info on the tank capacity in the 1937 edition of the Sales Handbook for Commercial Cars and Trucks. Page 19: "The 1 1/2 -ton fuel tanks are 18-gallon capacity, while the commercial tanks are of 18-gallon and 16- gallon capacities." Page 144: Fuel Tank Capacity..."18 gal. (Cab types) 16 gal. (chassis, panel, canopy expr)" Page 153: 1 1/2 Ton Chassis...."Capacity 18 gallons" It appears the answer to the tank capacity depends on a number of factors. In each Model series (GC, GD, GE, etc) there were a variety of options available. The 1929-1942 Master Parts Catalog (page 8) for example shows: Series "GC" Master 1/2 Ton Commercial Models Wheel base ---112" It then lists "Chassis" "With Cab, Cab and Pickup Box, Panel Body, Single Unit Canopy Express, Suburban Body" Similar info is shown for the other model series. Once again it seems the answer to a seemingly simple question about these old trucks can lead to more research than would seem expected, initially. That's one of the fun and challenging benefits of the hobby! 
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As someone mentioned earlier the enclosed models mounted the tank on the chassis while the others put it under the seat. With my 38 it is under the seat and is wider than the chassis at that point. If the chassis mounted tanks are between the chassis that would explain the lower capacity.
Tony
1938 1/2 ton Hope to drive it before I retire
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My '36 has tank under the bed near the rear and holds 14 gal. This may not be the original tank but I am the second owner. If it was replaced it was done by the first owner before 1964.
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According to my ruler gas gauge it had 1/8 tank of gas so I filled it up and took 15.6 gallons to fill so it looks like its a 18 gallon tank,I have only filled this tank a few times and probably had at least 1/2 tank when I did so today was the first with not much in the tank. 14.6 miles to the gallon and was hoping it would have been a little more.
VCCA #45194
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Backyard Mechanic
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Not to confuse the issue, but the 1937 GMC t-14 had a 16 gallon tank
1936 GMC T-14 low cab. TA for 1935-37 GMC, Director of the Gulf Coast Region
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Hi Jeff,
Maybe I misread your last post. Are you disappointed that the tank is only 18 gallons or in the 14.6 mpg?
If you got that mileage you are doing very well!
Rusty
VCCA #44680
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I was hoping for a little better gas mileage,yesterday I fired up a daily driver that sat all winter that I know had at least 1/4 tank but it was empty so since the gas had evaporated from the late model now I think some had from the 37 too since it was last filled in early november. I took it on a 230ish mile trip before it was parked and neglected to check the tank when I parked it,gas gauge does not work so I marked a ruler and had about 1/8 when I filled it up. Now that its getting warmer I will take it on another trip and will not wait very long to refill this time.
VCCA #45194
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