The space under the cockpit is large enough to accomidate a fixed fuel tank. Tempo makes at least two tanks that could be fit in the space. The filler cap would be in the floor of the cockpit. I would install an OMC type fitting in the engine well to attach a fuel hose that leads to the engine.
Tempo Fuel Tank Dimensions
Height includes 1 3/4" filler neckSide
TP12T TP18D
W 14" 11 3/4"
H 13 1/2" 13 3/4"
L 20" 17 3/4"
Tempo web site
A view of the engine well and fuel storage | |||||
Another view of the engine well and fuel storage | |||||
Pre 1975 cockpit and engine well. Changes to engine well in '75 Space under the cockpit | The fuel tank would go where the jack is in this photo of the cockpit floor delamination repair I made. | |