Bad gas removal-gctid808846

[Mrich]

Hi

Searched and found some solutions and they all seemed to have caveats. Just trying to empty 1/2 tank of gas on 86 16' Capri. Tried the siphon method I used as a child, but the hose hits something before it gets to gas. Please humor me on focusing on the fuel, but it was running fine until I added gas at a different dock. It immediately started knocking and after slowly making it home it cranks but won't start. A little gas in the carb doesn't help. which I know points to ignition, but I'm getting spark( hard to tell how strong in the light) at all plugs.

Again, I really want to start by removing the gas.Thanks in advance.

[CptCrunchie]

"Mrich" post=808846 wrote:
Hi

Searched and found some solutions and they all seemed to have caveats. Just trying to empty 1/2 tank of gas on 86 16' Capri. Tried the siphon method I used as a child, but the hose hits something before it gets to gas. Please humor me on focusing on the fuel, but it was running fine until I added gas at a different dock. It immediately started knocking and after slowly making it home it cranks but won't start. A little gas in the carb doesn't help. which I know points to ignition, but I'm getting spark( hard to tell how strong in the light) at all plugs.

Again, I really want to start by removing the gas.Thanks in advance.

Sounds a little like you got some water in your tank. Do you have a fuel filter with a settling bowl you can have a look into? If not, I suggest you add one. IMO, Racor is one of the best. Just know that if you install it in the engine bay, you have to use the http://www.defender.com/product3.jsp...all metal one. Otherwise, you can use the http://www.defender.com/product3.jsp...hrough bottom.

And welcome to BOC! Please fill out your profile information so we can better assist you in the future. Just click on your name and then 'edit'.

[Mrich]

Thanks. That's one of the first things I'm going to do after I get the bad gas out. Can someone who's done this successfully on this particular boat let me know how they did it? Thank you.

[Mrich]

Remove the gas, not install filter.

[Pcpete]

Similar but not the same, 1) disconnect the fuel line at an easy point between the tank and engine 2) run the incoming side tube for a dinghy motor fuel tank hose with bulb into the bilge through the drain plug hole and attach it to the hose or fitting connected to the tank 3) put the free end of the hose into a suitable container 4) pump the bulb until gas flows.

This way the old fuel is pulled out of the tank from the fuel pickup tube.

[Four_Pyrates]

"Mrich" post=808874 wrote:
Thanks. That's one of the first things I'm going to do after I get the bad gas out. Can someone who's done this successfully on this particular boat let me know how they did it? Thank you.

You could have had a water in the gas issue that got in your face when you put some new gas in to stir it up. Drain it, put some dryer additive in, put on a new fuel filter and fill er up.

[Chief_Alen]

There is a small channel at the very bottom of the tank, you tried coming in from the fill ?

Crank the bow up.

Disconnect the battery.

Remove the hose that leads to the engine.

Unscrew the fitting / anti-syphin valve, insert a clear hose to the very bottom.

Check to see the valve is clear, and if a screen is present on the fuel,pickup tube is clear.

Hook up a cheap electric fuel pump.

Pump the old fuel out.

At this point you could pressure test the tank and blow air thru the vent to make sure it's clear ; but you are very specific in your query.

Me I would hook up a outboard type tank with clean fresh fuel and start the boat.

Use the external tank till you do have a good running engine.

Good luck !

If you need more just ask.

[Mrich]

Thanks for the replies. Could you please tell me exactly how to connect the outboard tank? Sorry, I've been super fortunate with this old boat and haven't had to do anything except change impeller and plugs.

[Guest]

i have drained a fuel tank thusly.....obtain a long enough piece of fuel hose with a primer bulb on it that allows you to attach the primer bulb end to the fuel tank (at the fitting that feeds the engine, and you have removed the existing hose from that fitting), and run the other end in the bottom of the boat with the end of it sticking out the hull drain plug hole. place that end in a bucket or other large enough container, and then squeeze primer bulb to start the flow. Once its syphoned and flowing, it will continue to drain as long as the drain end is lower than the tank. To intermittently stop the flow in order to place another container at the ready, just lift the hose drain end higher than the tank , then restart by just laying it back down into the new empty container. I drained about 40 gallons like this once, in order to pull a bad tank. No electricity required.