Maybe I’m Overthinking this but…

[Morgan3820]

Maybe Overthinking this but… I have a transfer tank in the back of my pick up that I used to haul Av gas from nearby airport to my hanger. I was thinking about cleaning it out and putting in unleaded auto fuel. Knowing that the leaded av gas will mess up my catalytic converter in the car. How do I know that I have the tank sufficiently clean before I start running it in my cars?

 

[Daleandee]

I would think that yes, you're overthinking this. Drain it as best you can, fill with auto fuel ...

 

[RyanB]

I would think that yes, you're overthinking this. Drain it as best you can, fill with auto fuel ...

Yeah, I can’t imagine whatever trace amounts of AvGas that are left over, would pose any major issue.

 

[Gary Ward]

Maybe Overthinking this but… I have a transfer tank in the back of my pick up that I used to haul Av gas from nearby airport to my hanger. I was thinking about cleaning it out and putting in unleaded auto fuel. Knowing that the leaded av gas will mess up my catalytic converter in the car. How do I know that I have the tank sufficiently clean before I start running it in my cars?

Agree with the other posters, a little left over 100LL mixed with unlleaded is not going to hurt your car.

I am in the fuel business and have had a transfer tank also in my truck bed since 1989. I have used it for unleaded gas, diesel fuel, then unleaded gas and now currently I have 100LL in it.

 

[455 Bravo Uniform]

If you want to be extra cautious, drain and let the residual wetness evaporate, then fill with your fuel of choice.

 

[Gary Ward]

If you want to be extra cautious, drain and let the residual wetness evaporate, then fill with your fuel of choice.

My tank does have drain plug on both sides. I have drained it over the years a few times to check for rust. I have found very little rust in it since I keep it sealed from the atmosphere to keep the water out. Another trick I have done is tossed a magnet inside the steel tank. It was custom made for me by the local welding shop out of 11 ga . It has stood up to the test of time.
He really does not need to drain his tank if there is no more than 1-2" at the bottom of 100LL, imo. Also depends on the capacity of the tank.

 

[GaryM]

If you want to be extra cautious, drain and let the residual wetness evaporate, then fill with your fuel of choice.

TEL isn't all that volatile; most will be left behind when the residual gas evaporates. And it doesn't take much to poison a catalytic converter.

Not saying the plan won't work, but I'd be as diligent as possible about getting the avgas out of the tank before filling with auto fuel.

 

[Torque beast]

If you’re worried about it put 5 gallons of unleaded in and drive around to rinse tank then drain into gas can and use in your lawnmower.


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[455 Bravo Uniform]

Actually, I wouldn’t worry about the cat as much as O2 sensors.