fuel prob...

[harleydice]

Hi I picked up a Attex today I took off gas tank fuel been there for a long time smelled bad!!! I took hose off at tank ... Had to cut and there was a cap where line went in to took off to find there is another line in tank? I need to clean rust out of tank so what do I do with that hose in tank? thanks ..

[Toys4Me]

If its like my superchief that cap should of had a nut on it. With the nut off then it all should fall in the tank. Fish the line out the fill neck with a coat hanger or wire. Had to replace the line in one of my attex tanks last fall.

[harleydice]

great thanks !!!!

[harleydice]

more fuel prob...

For some reason im not getting fuel into carb? The guy who I got Attex from said carb was rebuilt .... I took bottom of carb off I dont see any flotes?? Im not to sure how this carb works... right now I dont have gas tank hooked up so I took a funnel filled up line with gas nothing.. if I spray stuff in carb will start for a sec... so I fig it a fuel prob.. thanks for looking .. Scott

[Toys4Me]

What kind of engine? Is there a fuel pump? Pics of setup can also help.

[harleydice]

Motor is a J.Lo Rockwell ... I dont see any wires for a fuel pump .. Im sure about this kinda carb... Maybe some kind of diaphragm pump in carb?

[hydromike]

Hi Scott...

What model Attex do you have? The JLO engines indeed use a pulse style, diaphragm pump. Most earlier (first generation) Attex machines used a tillotson style carb with integrated pump on the single-cylinder engines (and no internal floats). Later models (twin cylinder, and the single 295 JLO) used a Mikuni carburetor (with floats) with a separate plastic pulse pump mounted on the back of the upper body. The clincher is that JLO (outside of their use in Attex machines) also used Tilly's on some twins. So, if something's been retrofitted, it could have a Tilly on a Twin. (sounds like a weird 'ol 1930's song, huh?)

Here's a shot of a Tillotson....



Does this look like your carburator? If so, it could be a torn or leaky diaphragm on the pump. Or, it could be a cracked line, a plugged vacuum port, plugged fuel filter. A number of things. I'd start trouble shooting from the tank back (once you get it hooked up) , and make sure you're at least getting good gravity feed toward the back of the machine, and work to more complex issues after that.

[harleydice]

Yes thats the carb !!!! I will check for cracked lines ...and also vac port ... Thanks for all your help !!!!

[Bazooo guy]

A common problem is the diaphragm becomes stiff or ruptures.
The rebuild kits are cheap and easy to install.
As suggested make sure the fuel is getting to the carb and if it has a return line to the tank
check that its clear and not cracked.Same with the pulse line (if its external) from the crankcase.
First thing is to identify your carb and go from there.

[Toys4Me]

Another issue with the pulse pumps do not last long with ethanol gas.

[harleydice]

I think the gasket on bottom of carb where the gas line gos into is shot. so prob not getting proper vac? Not sure I like this carb !!!! lol is there a norm carb I can put on this? I cant wait to ride this thing !!!! thanks Scott

[hydromike]

Hey Scott,

There is actually an adaptor for the JLO singles that allow the use of a small VM28(ish?) Mikuni slide and float style carburetor, which would really begin to alleviate your problems. You'll need the carburetor, the adaptor, a separate pulse pump, and a modified throttle and choke cable to make the change.

I don't have the part number for the carb adaptor, but maybe somebody else could be of more help. The JLO singles with these Mikuni's aren't THAT uncommon, but I'm not sure what other applications (other than an Attex ST/295 and 295 Wild Wolf) actually used them.

I'll try to do a little more research and see if anything turns up.

[Bazooo guy]

Or you could buy a kit for your carb and rebuild it.
The carb you have will work at any angle and thats important if you climb your aatv up or down steep hills.
Float type carbs dont like to be at an angle and vibration can also cause problems.
Look at the carb on your chainsaw or weed eater.
A lot of members hate the tilly carbs and im not sure why.
If you are worried about ethanol eating the rubber in your fuel system just add stabilizer to the fuel.

[hydromike]

The carb you have will work at any angle and thats important if you climb your aatv up or down steep hills.
Float type carbs dont like to be at an angle and vibration can also cause problems.

Agreed. Any sustained hill climb longer than 4 miles at an angle over 60 degrees should be avoided.
And vibration? C'mon; the Mikuni was reliable, stock equipment on JLO singles. I'm not trying to defame the Tillotson; he asked if he could put a "norm carb" on it. If you want to invert the Attex and run it, then put a chainsaw carb on it.

[Bazooo guy]

No doubt the Mikuni is a good carb and could be used with a few mods.
If the previous owner rebuilt the carb why is the gasket on the bottom shot
All im saying is the kit to rebuild his carb is inexpensive and easy to install.
To me that would be the way to go and if it works would save him some coin for tires