WD 40 and air. WD 40 will clean even varnished old gas just make sure you let it soak in. You can buy a gallon of liquid WD most anyware Lowes, Home Depot.

 

Whilst filters are off I would blow the lines backwards from the pump inlet.

To do this the tank should be disconnected from the lines as otherwise it will kick a lot of vapours from the tank into the atmsosphere which is explosive.

You will need to replace the sock on the end of the fuel pickup and any inline filter you may have.

After standing for a year the gas is possibly destablised but you may also have some rust scale formed that ha now dropped into the tank. Normally this will accumulate at the bottom and only when low on gas will it become a problem.

 

Hello,

A passivation bath will work too... (you need to spray a vernis to protect them again) I think gas tank will work too :thumbsup:

Fuel lines before:

after

Passivation Bath in action with CJ tub:

after

Regards,

Gilles

 

Pour a couple cans of SeaFoam in your tank!!!

 

Acetone dissolves varnish. Remove the tank, pour in a quart of acetone, slosh it around, and drain. You can save the used acetone for parts cleaning.

If you want to get more aggressive, you can use muratic acid. You will end up with shiny bare metal.

My favorite, is KOH (potassium Hydroxide or potash) dissolved in Hot water. Slosh it around for ten minutes, and again shiny metal. NaOH (Sodium Hydroxide) works the same.

All these chemicals are very noxious to say the least, so follow the usual precautions.

 

... If you want to get more aggressive, you can use muratic acid. You will end up with shiny bare metal...

That will clean the metal but I prefer Phosphoric acid. It etches bare metal, removes or converts rust, and leaves a coating on both rusty and clean metal.

I use Muratic (hydrochloric) acid to clean concrete.

 

I tried a few different things including a pressure washer to clean the junk and build up out of the inside of my poly tank and nothing seemed to get it as clean as I wanted. A few cold ones and a next door neighbor suggested to me, the best way to clean it would be to put landscape type gravel in it add cleaner (I used concrete etcher/cleaner because it was the only thing in the garage and it is great on rust) and agitate it back and forth. So,...... I got the gravel from my flower beds filled it with water and cleaner. Drank more cold ones while rocking it back and forth, few more cold ones and about and hour and a half later it was clean as a whistle. Also had some bright white gravel to put back in the flower bed.

 

Your symptoms more point to blocked idle pickup tube ends in the carb. This happens from sitting too. To see if that is it, carefully watch down the running carb while giving it a slow shot of gas. If you get sprays of gas, ok, if you see drops of gas, the idle tubes need to be pulled and cleaned.

They have a crimped end that is slightly smaller than the other hole ( a defect really) that can be fixed by using a dremil tool bit or a welders file of 0.032". This makes the crimped big enough to keep clear.

the tubes are in the center of the venturi under those two screws.

 

Your symptoms more point to blocked idle pickup tube ends in the carb. This happens from sitting too. To see if that is it, carefully watch down the running carb while giving it a slow shot of gas. If you get sprays of gas, ok, if you see drops of gas, the idle tubes need to be pulled and cleaned.

They have a crimped end that is slightly smaller than the other hole ( a defect really) that can be fixed by using a dremil tool bit or a welders file of 0.032". This makes the crimped big enough to keep clear.

the tubes are in the center of the venturi under those two screws.

After dropping the tank, cleaning it (rinsed it with gas and poored it out, only a little bit of dirt was in there), blowing the lines, new fuel filter, new sending unit and cleaning a bunch of little crap out of the carb... it still wont idle. Going to try what Mike Romain said tomorrow and hope it works.

-Thanks for all the advice! Ryan.

 

I took off the air-fuel screws on the front of the carb and put a little wire through and clean a little bit of dirt out. Now idles fine however just after I had it working the fuel pump started leaking lmao. Thinking of buying a new one along with a gasket and keep the old as a spare. What do you guys think?

- Thanks, Ryan

 

I took off the air-fuel screws on the front of the carb and put a little wire through and clean a little bit of dirt out.

What do you guys think?

I think you need to keep little wires out of the carb. Use carb spray cleaner and compressed air only. You will do more damage than good.

 

Run it for at least an hour and it might clean itself out. Gas will desolve varnish eventually if the gas is moving where it is clogged. Otherwise, sounds like a carb rebuild.

 

Thanks for the help!