I have a Yamaha FJ-09 with a stock tank capacity of 4.8 gallons. I want to install a ~5 gallon aux tank above the pillion seat, plumbed into the main tank with a bulkhead fitting.
My concern is about overfilling the main tank and spilling fuel out the vent. When the fuel warning triggers on the FJ I can usually put 3.8-4.0 gallons in the tank. So my thought is to open the aux tank petcock only after the fuel warning triggers. The bottom gallon or so of fuel in the aux tank should be below the top of the main tank, which should prevent spillage.
Thoughts? Am I missing anything?
My concern is about overfilling the main tank and spilling fuel out the vent. When the fuel warning triggers on the FJ I can usually put 3.8-4.0 gallons in the tank. So my thought is to open the aux tank petcock only after the fuel warning triggers. The bottom gallon or so of fuel in the aux tank should be below the top of the main tank, which should prevent spillage.
Thoughts? Am I missing anything?