I have an aux underseat tank in the wife's 109, using a military style tank. I use individual electric fuel pumps for each of its three fuel tanks. My 109 has an underseat tank in addition to its rear tank. I use a marine fuel tank selector valve to select between tanks, and have a fuel gauge for each tank. The Series fuel selector valve that I used previously was always a slow leaker, dueto its cork wafer seal getting old and brittle.
I'm still arranging mmy 88 ser 3 to have dual tanks, though I never liked the military under seat filler arrangment. The thought of spilt gas inside the cab was enough to push me to using a stock tank with an added external filler basically mimicking the other side.
My old ford bronco had dual tanks and I loved that feature, though at least the fillers were on the same side.
I installed mine using Terriann's instructions.
Worked great!! The fuel lever I got from a boating supply store and I just installed a switch to move between the two fuel sending units.
i put in a regular tank under my seat. plan is to have a custom muffle guy weld a reducer on the end of a filler tube so that i can get some flexable gas tank fill hose from the local auto parts store and the cut the tub and install all those parts. but mean while i put a "T" in the primary tank vent tube and plumbed the aux vent tube into the "T". i found a black rubber pipe cap at the hardware store that fits so tight that it's a bear to get off. fumes aren't too bad but i've got the doors off and the sides of my canvas rolled up
'64 Series IIA 88 Canvas Tilt
'68 Series IIA RHD Ambulance
'76 Spitfire 1500
'07 LR3 (Series Recovery Vehicle)
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