fuel system

[RustydoubleA]

Model As and AA trucks vibrate like crazy, and this vibration loosens debris inside the fuel tank. Fuel tank shut of valves have only a 1/4" opening, and larger pieces of sediment in the tank will not go through the valve or will get stuck at the 90 degree part of the valve. Those filters that slip on the inside part of the fuel valve do not work in the long run because the debris stays inside the tank and clogs the filter up over and over again. I want the debris out of the tank and become caught in the sediment bulb, so I upgraded my fuel systems by replacing the fuel tank valve with a 1/4" ball valve, 1/4" fittings and drilling out the inlet of the sediment bulb to 19/64". This way the large debris will pass out of the tank, through the valve, through the inlet of the sediment bulb and hopefully stay inside the bulb. Some 1/4" ball valves have only a 1/4" opening, but get the ones with the larger 9/32" opening. The flare on the 3/8" tubing is large enough to seal on the enlarged sediment bulb inlet hole. Also, unlike the packing gland on the fuel cocks that are prone to leaking, ball valves seal very well. Passengers do not care to smell gasoline inside the cab! It is easy to put everything back to stock when the tank is cleared of the heavy debris, but I never convert them back to stock. Attached are some pictures. Steve.

[RustydoubleA]

To evacuate an empty tank of loose debris while it is still in the cab, I made up a hose with an air gun blowing though a hole in the hose near the discharge end, this creates a safe vacuum to pull stuff from the tank. Do not use this devise near electric motors, pilot lights, or inside a garage. Steve.

[elfox]

I would still be concerned that you might generate a spark, as the air rushing through the inside of the house can still generate static electricity on the surface of the hose!