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Unread 02-16-2013, 12:47 PM   #1
Kim72
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Old Gas In Tank

My son's 92 YJ has been in storage for about 5 years while he went to school and got established in a job. We're making plans to put it back on the road. The gas tank is about 1/2 full. I would believe that the gas is pretty stale by now. I tried to siphon it out but can't get a hose into the tank. Would adding new gas to the old be ok at this point?? Any gas additive I can use?? I don't want to have to drop the tank!!

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Unread 02-16-2013, 01:03 PM   #2
pasinbuy
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No, drain the tank. I would drop the tank and clean it myself. Dropping the tank is easy. The spray the inside of the tank with carb cleaner to make sure it is perfectly clean.

Bad gas is bad gas. You could burn a hole in a piston by mixing bad gas and new gas. Your risk. Five years is way too long to risk.

Plus by dropping the tank you can remove the 15 gallon tube and make the tank a 20 gallon tank.
Two birds with one stone.
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Unread 02-16-2013, 01:26 PM   #3
seattle_yj
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They make a 1/2 " siphon, it will fit in the YJ and it is manual activation using a ball bearing on the end. They also make a 99$ fluid siphon that is electrical, (i know what you're thinking, danger right?)it is quite common process in the marine industry though.
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Unread 02-16-2013, 01:34 PM   #4
pasinbuy
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Problem with our Yj is that you have to go through two 90 degree turns before being able to siphon fuel.

On from the fuel fill to the tank and the other from the tank opening down to the fuel if I remember right? The hose must be very bendy or flexible.

I still say drop the tank so that you can clean the old varnished gas on the sides and bottom of the tank with the carb cleaner.
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Unread 02-16-2013, 05:23 PM   #5
clarkmcmp
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My son and I pulled a wrangler out of a back yard couple years ago. It was a mess. I threw a battery in it and it started. I tried to just add fresh gas and run with it. I started bending push rods when valves stuck. Ended up pulling the head and taking it to machine shop. The old motorhead told me I was running some bad gas. I dropped the tank and scraped varnish out for couple hours. Put rocks and carb cleaner in the loosen things up. Finally got it all clean. All is good now but skipping the cleaning the tank was not a time saver. Go ahead and convert your tank to a 20 gallon conversion (10 minutes) while you have it out.
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Unread 02-16-2013, 08:21 PM   #6
seattle_yj
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Quote:
Originally Posted by clarkmcmp
My son and I pulled a wrangler out of a back yard couple years ago. It was a mess. I threw a battery in it and it started. I tried to just add fresh gas and run with it. I started bending push rods when valves stuck. Ended up pulling the head and taking it to machine shop. The old motorhead told me I was running some bad gas. I dropped the tank and scraped varnish out for couple hours. Put rocks and carb cleaner in the loosen things up. Finally got it all clean. All is good now but skipping the cleaning the tank was not a time saver. Go ahead and convert your tank to a 20 gallon conversion (10 minutes) while you have it out.
Does the 20 gal hang down any more than the 16 gal?
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Unread 02-17-2013, 09:47 AM   #7
Louie4
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I'd be inclined to pull the fuel line by the filter and let it pump out first then pull the tank as it will be easier to handle.

Of course you need to make sure there are not any open flames, sparks, etc. when doing this and attach a longer piece of hose to have it drain into another container.
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Unread 02-17-2013, 10:32 AM   #8
Mark05059
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Quote:
Originally Posted by seattle_yj View Post
Does the 20 gal hang down any more than the 16 gal?
same exact tank. You remove part of the vent inside the filler tube.
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Unread 02-17-2013, 01:48 PM   #9
bigbossd1030
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Quote:
Originally Posted by seattle_yj

Does the 20 gal hang down any more than the 16 gal?
You don't actually use a different tank. You use the stock tank. Inside there is a vent tube. This tube protrudes into the tank a certain amount, when you fill the tank the gas splashes up into this tube, triggering the gas pump to stop pumping, telling you it's full. But it's only filled to 15 gallons. By removing this tube, you add an additional 5 gallons to the stock tank. This was an option avail at purchase for an extra cost when really the dealer is actually saving money on the tube.

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Unread 02-17-2013, 02:26 PM   #10
seattle_yj
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Interesting, thanks for the info.
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