ditching 3 year old gas - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 20 (permalink) Old 11-01-2013, 07:50 PM Thread Starter
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ditching 3 year old gas

my biggest issue right now with reviving an 02 that's been on a 3 year hiatus is getting rid of the 3 year old gas that's full to the fill cap.

What's your recommendation on how to remove the fuel? I have already ordered 2 washers for the fuel line that connects to the tank, if I have to remove the tank. I am under the assumption that the fuel pump is in the tank and that the fuel will not rush out the bottom of the tank once the fuel line is removed.

Of course I could be wrong.

Another option i've though of is modding a fish tank water circulator to pump out the fuel, since I don't want to turn the tank upside-down.

I've also thought that if the fuel does not rush out when the tank is removed that I could connect 12V to the fuel pump and just have it pump the bad fuel out.

Any recommendations?
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post #2 of 20 (permalink) Old 11-01-2013, 07:58 PM
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Ditching 3 year old gas: good idea.
I've switched tanks a few times, I think the easiest way is to just lift the tank, siphon out the gas, then unhook the banjo bolt. Have a rag underneath, but there should be very little spill.

If you don't drain the tank, you will get massive amounts of gasoline coming out when you break that connection.

Dont use your fuel pump to pump out bad gas. Bad idea.

John, 2000 RC51 #000100

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post #3 of 20 (permalink) Old 11-01-2013, 08:01 PM Thread Starter
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Should the fuel pour out the bottom if there is a fuel pump in the tank? I though that the pump would stop the flow if there's no voltage.
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post #4 of 20 (permalink) Old 11-01-2013, 08:23 PM
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I was thinking since you have old gas, you'd be taking the tank off. How far do you want to go - tank off and proper cleaning, or just get all the gas out?
I'd buy a new fuel pump gasket, ($10), take the fuel pump assembly off the bottom of the tank, inspect and clean, and put it back together. Your fpr might be ok for a while, but after 3 years of sitting it might not last long.

Don't run that old gas thru your fuel pump.
I think a fish tank pump would fail pretty quick Lol

If you unhook the bango bolt fitting, or the return line, gas will drain out unless you've emptied the tank first.

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post #5 of 20 (permalink) Old 11-01-2013, 08:38 PM Thread Starter
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First off, this isn't my bike. It's my brother's. He's pretty much lazy with self-initiative, so looks like i'll be doing all the work and head scratching. I prefer to do things the thorough and proper way. I don't like short-cuts with my toys, but this is my brother's bike.

Messing with the tank isn't a huge task, so I'll just see if the current pump will work. If it fails later, it's his problem.
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post #6 of 20 (permalink) Old 11-02-2013, 08:29 AM
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Go here

This will help remove the majority.

http://www.globalindustrial.com/p/ma...Fa47MgodeFgACQ



The very first schoolbook that was written had God all over it. --Dave Mustaine
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post #7 of 20 (permalink) Old 11-02-2013, 10:10 AM
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3 year old gas isn't gas anymore. It's freaking varnish. Do what you want. The fuel pumps are not rebuildable. Fuel pumps cost in excess of $150. Fuel filters cost around $45. Who's gonna repair it if it fails or plugs up? Your brother, or you? I don't understand why you want to use the bike's pump when a siphon hose is so incredibly easy and obvious.

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post #8 of 20 (permalink) Old 11-02-2013, 08:26 PM Thread Starter
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Well we were able to suck out over 4 gallons using an old mityvac I had. It took a long time. Filled up the tank with new premium and the bike fired up. We're having idle issues, but it runs fine if you keep it rev'ed above 2k. Riding it, it's fine. Coming to a stop, and the bike cuts out. I can't turn the idle adjuster clockwise anymore.

We're having no luck with setting the idle, thermostat at 180 degrees.

Any thoughts?
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post #9 of 20 (permalink) Old 11-02-2013, 08:31 PM
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Remove the air box and spray the carbs down. (You might be able to see if anything was living in the air box too.) This would be a good time to check the fuel pressure regulator.

I'd buy a pint of Seafoam too and dump it in this tank and run the piss out of it.



The very first schoolbook that was written had God all over it. --Dave Mustaine
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post #10 of 20 (permalink) Old 11-02-2013, 08:32 PM
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The injectors my be dirty and or clogged. I seen a set for sale on here a few days ago or have yours cleaned.
Just my thought

James

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