I measured the 1991 Dakota 22 gallon fuel tank. L = 42 in; W = 18 in; H = 19 in. The additional 7 gallons between the small and large tank would be found in additional length. Doing the math the additional length of the 22 gallon tank is 4.5 inches. So the approximate dimensions on the 15 gallon tank:
L = 37.5 in; W = 18 in; H = 19 in.
Today I was thinking about this and there is a different fuel tank from an older Chevy pickup that is closer to your original tank dimensions. The 1973 - 87 Chevy C10 / GMC 1500 short wheelbase 1/2 ton trucks used a side-saddle outside the frame mounted fuel tank. Maybe that would be easier to retrofit into your Dodge. Here is a link to a picture of one of these tanks. Maybe you could find one of these at a salvage yard. It was mounted on the short bed / 6.5 foot bed trucks and had 16 gallon capacity. Connecting the fuel filler would be a challenge.
1979 Chevy C10 Truck Front of Rear Axle Mounted Gallon Fuel Tank at 1A Auto.com
3-81 GM Truck Fuel Tank. New. This high quality replacement tank is a direct replacement for your damaged or leaky original. This tank mounts in front of the rear axle.
Specifications:
· Capacity: 16 Gallons
· Dimensions: 42-7/8 X 14-1/8 X 10-1/2 inches
· Small Filler Pipe: 1-1/4 inch inside diameter
Includes the lock ring and the gasket for sending unit.
This tank is Department of Transportation (DOT) and Society of Automotive Engineers (SAE) approved.
And thinking back to your original question about using a fuel tank from a 1965 - 66 Ford Mustang, here is a video link to a R & R on that fuel tank. It gives a good visual picture of the tank orientation and the challenges of the fuel filler neck location and fuel pickup.
L = 37.5 in; W = 18 in; H = 19 in.
Looks like length would not be an issue. Width is close and might fit???? Height is an issue at it seems the 15 gallon Dakota tank might have to sit with partial exposure below the frame rail??? That might require some additional metal reinforcement around the bottom of the tank for protection??
Today I was thinking about this and there is a different fuel tank from an older Chevy pickup that is closer to your original tank dimensions. The 1973 - 87 Chevy C10 / GMC 1500 short wheelbase 1/2 ton trucks used a side-saddle outside the frame mounted fuel tank. Maybe that would be easier to retrofit into your Dodge. Here is a link to a picture of one of these tanks. Maybe you could find one of these at a salvage yard. It was mounted on the short bed / 6.5 foot bed trucks and had 16 gallon capacity. Connecting the fuel filler would be a challenge.
1979 Chevy C10 Truck Front of Rear Axle Mounted Gallon Fuel Tank at 1A Auto.com
3-81 GM Truck Fuel Tank. New. This high quality replacement tank is a direct replacement for your damaged or leaky original. This tank mounts in front of the rear axle.
Specifications:
· Capacity: 16 Gallons
· Dimensions: 42-7/8 X 14-1/8 X 10-1/2 inches
· Small Filler Pipe: 1-1/4 inch inside diameter
Includes the lock ring and the gasket for sending unit.
This tank is Department of Transportation (DOT) and Society of Automotive Engineers (SAE) approved.
And thinking back to your original question about using a fuel tank from a 1965 - 66 Ford Mustang, here is a video link to a R & R on that fuel tank. It gives a good visual picture of the tank orientation and the challenges of the fuel filler neck location and fuel pickup.
