Pumping old gas from my boat

Joined
Mar 21, 2004
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33,563
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Near the beach in Delaware
So I have contemplated it previously but I will do it this spring. I think I have 30 to 50 gallons.

The plan is to pull the fuel line from the tank or fuel pump. Run gas hose outside the boat to a fuel transfer pump and pump it into 5 gallon containers. Buying some cheap ones off Facebook Marketplace. I think they are used cooking oil containers. Will test one ahead of time to make sure gas will not melt them.

Looking at the pump in the screen shot since it has a gas dispenser nozzle with a valve. Don't want gas overflowing the containers. Will have a large fire extinguisher.

The marina will not let me do it onsite. So maybe at a Walmart parking lot.

Screenshot_20260327-132557.webp
 
My biggest concern is a fire. My son-in-law's mechanic pumped or siphoned gas from his diesel work truck (they filled it with gas by mistake) into a gas caddy. It overflowed the gas caddy. Caught on fire. Took out the back of his truck and completely burned up a nearby car.
 
I can vouch for this unit, works fine with a car battery or jump pack. The main thing is to monitor everything constantly and manage the spills. Spills are inevitable.

https://www.amazon.com/dp/B096JVDW99?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1
So what do you do when one container is full and need to move to next container? The one in my screenshot has a nozzle like a gas station. I can fill a container and let go of the nozzle lever.

I don't mind spending $100 or so on a transfer pump.
 
Why don't you just get a $9 universal pump? Are you doing this more than once? What's your angle on this, are you selling the boat or you just want to use cheaper gas that you already own?

Sparks will be the concern. Keep your battery and switch many many feet away from the operation and don't work them with gassy hands.
 
So I have contemplated it previously but I will do it this spring. I think I have 30 to 50 gallons.

The plan is to pull the fuel line from the tank or fuel pump. Run gas hose outside the boat to a fuel transfer pump and pump it into 5 gallon containers. Buying some cheap ones off Facebook Marketplace. I think they are used cooking oil containers. Will test one ahead of time to make sure gas will not melt them.

Looking at the pump in the screen shot since it has a gas dispenser nozzle with a valve. Don't want gas overflowing the containers. Will have a large fire extinguisher.

The marina will not let me do it onsite. So maybe at a Walmart parking lot.

View attachment 330087
Get a wheeled fuel tote. Back when I repaired race cars my boss had one to carry fuel for customer cars for the weekend. Had a hand pump. I think he got from vp racing.
 
Why don't you just get a $9 universal pump? Are you doing this more than once? What's your angle on this, are you selling the boat or you just want to use cheaper gas that you already own?

Sparks will be the concern. Keep your battery and switch many many feet away from the operation and don't work them with gassy hands.
This is a one time job to get old gas from boat. Dispose or give it away and start the boating season with fresh gas.

My idea of a pump with a dispensing nozzle (like a gas station) was solely to not have to turn pump off/on as I switch container to container. So less chance of sparks.
 
I did this often, but my set up was different. I had -AN fittings in my fuel system. disconnected the fuel line after the water separator, inserted the 12V electric fuel pump made up with alligator clips for battery and a switch. Sat in the boat with a 5 gal plastic jug, transferred fuel, put fuel into car or lawn equipment... anything can be set up if you do this more than once a year... I run through the water sep to catch any water from the fuel. and this fuel has been treated previously.
 
So what do you do when one container is full and need to move to next container? The one in my screenshot has a nozzle like a gas station. I can fill a container and let go of the nozzle lever.

I don't mind spending $100 or so on a transfer pump.
The pump has a simple on/off switch. About to drain a diesel tank this afternoon that has water contamination, it will be reused for brush burning. It should be effortless.
 
The pump has a simple on/off switch. About to drain a diesel tank this afternoon that has water contamination, it will be reused for brush burning. It should be effortless.
My thought (as a long time BITOG member I of course overthink everything) is to be many feet from the pump dispensing gas into containers. So any gas spills are far from the pump.
 
How old is the gas ? E0 fuel ? If stabilized before storage it should not be a problem unless its very old none E0.
I use PRI-G in mine now for winter storage. Have used Sierra in the past on other boats, zero issues. Just top off and go when it goes back into the water. E0 has a good ''shelf life'' untreated.
 
You are in Delaware. How about just burning it off in a major off shore fishing trip? ore fun....less money, effort and danger. Add some fresh gas before starting.
 
Get a wheeled fuel tote. Back when I repaired race cars my boss had one to carry fuel for customer cars for the weekend. Had a hand pump. I think he got from vp racing.
I am thinking I might have 50 gallons. More than most gas caddies. And when I am done I need to get the gas to a disposal place. 5 gallon containers are much easier.
 
When is the last time the engine was started? If recently did the engine run ok? I would certainly think of ways to use the gas by running the engine... unless this is a super expensive high performance engine
 
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