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Emptying the fuel tank

Old 04-10-2021, 05:58 AM
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Question Emptying the fuel tank

I have a Kingfisher 2525 and need to empty the 120 gallon tank (old gasoline). What is the best method. I think that I can get into the tank with a hose hand pump through the petrol filler opening. My boat is on a trailer.and I can use the gradient und also suck it in. Thank you for helping.
Old 04-10-2021, 06:41 AM
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I use a 12v fuel pump something like this:

https://www.amazon.com/Electric-Tran.../dp/B07JPDZC4M

It's slow, but it works.
Old 04-10-2021, 06:57 AM
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if it has an outboard, disconnect at the primer bulb. Then attach a hose and pump into a container
Old 04-10-2021, 07:05 AM
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12v elec fuel pump from O Riley's. put a copper tubing extension on the pick up hose and go thru the sending unit hole. that way you can get all the way to the back of the tank and get all the old gas out. takes a while.
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Old 04-10-2021, 07:17 AM
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Route your fuel line out the transom drain plug, siphon or pump the ball and let gravity do the rest.
Old 04-10-2021, 08:14 AM
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Thank you
Old 04-10-2021, 10:28 AM
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Great boat. Dad had a Kingfisher in Alaska. Almost the season. Are you in Alaska?
Old 04-10-2021, 11:43 AM
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Originally Posted by Bryan A. View Post
Route your fuel line out the transom drain plug, siphon or pump the ball and let gravity do the rest.

I did exactly this before repowering my boat years ago. Went from a 2 stroke (pre-mix) to a 4 stroke so the fuel had to go. I had 40 gallons in the tank and the Yamaha dealer gave me a 55 gal drum. Only thing I did different was I disconnected the line into the filter and ran the line through the bilge drain, it only took a little while to drain it.

Old 04-10-2021, 12:26 PM
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:Toss a match in there
Old 04-10-2021, 12:34 PM
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Amazon.com: Siphon Pro XL, Largest Siphon for Water, Gas, Diesel, It’s a Pump or Siphon, Get Work Done Fast, 8' & Shut off Clip: Automotive

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Old 04-10-2021, 12:36 PM
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Originally Posted by Mersiles View Post
I did exactly this before repowering my boat years ago. Went from a 2 stroke (pre-mix) to a 4 stroke so the fuel had to go. I had 40 gallons in the tank and the Yamaha dealer gave me a 55 gal drum. Only thing I did different was I disconnected the line into the filter and ran the line through the bilge drain, it only took a little while to drain it.

You know that pre-mix would have been fine to use especially if you could dilute it some with additional gas
Old 04-10-2021, 01:32 PM
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I used one of those 12 volt fuel pumps...worked fine...I ended up getting one of those cheap ones and it was really slow, then I borrowed one from a engine dealer near my house that he said was a high volume one, it was and really pulled the fuel out...

There was one that connected to a drill, if I remember correctly, I used to pump heating fuel from my old tank to my neighbors because we were converting to gas and needed to get the oil out...that worked great, too...

I ended up, just because I like to be prepared, is to pick up a fuel pump from an auto parts place...should have seen me trying to explain to them what I wanted to do with it...
Old 04-10-2021, 01:39 PM
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Disconnect fuel line from motor or racor and attach drain line to it going to drum or jugs
Disconnect vent line and connect vent hose to pressure regulated air compressor and pressurize tank to 3-5psi- fuel runs out quickly, can do it dockside with drum on the dock. Dont over pressurize.
Old 04-10-2021, 01:52 PM
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Shop vac. If your scared dilute gas with water
Old 04-10-2021, 01:52 PM
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The REAL question is what to do with the old gas. Can't just dump it down the gutter.......
Old 04-10-2021, 02:01 PM
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Originally Posted by fowl intent View Post
The REAL question is what to do with the old gas. Can't just dump it down the gutter.......
lawnmowers and golf carts!
Old 04-10-2021, 03:11 PM
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Shop vac. If your scared dilute gas with water
Extremely dangerous practice. Motors on shop vacs are not ignition protected. High risk for explosion and fire. Yes it has happened many times.
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Old 04-10-2021, 03:24 PM
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If it will siphon, do that with the fuel line. Good chance it has an anti siphon valve. If so, 12v pump.
Old 04-10-2021, 03:45 PM
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Depending on why you need to remove the fuel, using the fuel pickup is not the best option, because it sits well up off the bottom, and most rubbish is right on the bottom, far better to use the sender if accessible, or use a solid tube through the filler if possible, or a soft hose with a weight that will sit right on the bottom, the "easiest" method is often not the best.
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Old 04-10-2021, 04:13 PM
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My fuel pickup sits directly on the bottom of the tank, it has a screen tube on the end and you can feel it make contact when you install it. The tank I have is 88 gallons and the sending unit is 4’ away from the fuel pickup, the fuel pickup is 4” from the back of the tank.It would be extremely difficult to remove any water or debris from the back of the tank by going through the sending unit. I suspect most tanks here are built in a similar fashion, which makes draining through the fuel pickup the best option. Trying to remove the last 1/2 gallon or so by removing the pickup and inserting a tube will help to reach the reach the remaining fluid.


Originally Posted by noelm View Post
Depending on why you need to remove the fuel, using the fuel pickup is not the best option, because it sits well up off the bottom, and most rubbish is right on the bottom, far better to use the sender if accessible, or use a solid tube through the filler if possible, or a soft hose with a weight that will sit right on the bottom, the "easiest" method is often not the best.

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