my fj40 won't seem to run properly if i fill the tank over 3/4 full...it won't idle and will sputter a lot. the tank was made by the previous owner and is positioned underneath the cruiser behind the rear axle. i thought the problem was no air getting into the tank but i replaced the cap with one that breathes and i still can't fill the tank. any thoughts? thanks
rough running with full tank
- Thread starter 72FJ40
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stop putting diesel in it.
OK.
OK.
Have you checked the fuel filters? Checked to be sure the pump is getting fuel through to your carb? Changed your plugs, etc?
There are literally a laundry list of combinations or reasons for what you describe.
Good Luck. And remember, Green Handle is BAD GAS for the Cruiser!
OK.
Have you checked the fuel filters? Checked to be sure the pump is getting fuel through to your carb? Changed your plugs, etc?
There are literally a laundry list of combinations or reasons for what you describe.
Good Luck. And remember, Green Handle is BAD GAS for the Cruiser!
And are you going by the gauge as far as it being only 3/4 of the way full?
Your gauge could be off. Then again, if you can't fill the filler neck all the way up, then you have another physical problem.
Your gauge could be off. Then again, if you can't fill the filler neck all the way up, then you have another physical problem.
- Thread starter
- #6
i just replaced the plugs, wires, fuel filter, pcv valve and yes, i am going by the gauge as 3/4 full, if i fill the tank till the pump automatically stops, or if i look at the clear line running up the neck of the filler while i'm filling it and stop pumping when gas comes up through there, the engine will sputter wont idle and will run funny until the gauge drops from full down to about 3/4
Uh...............what about the carb.....?
yeah I agree with TJDIV it's prob your carb, is it a stock one, if so throw it away and buy a weber or holly. I got a weber and now mine runs like a champ. My stock carb was a POS the only way I could run it for a few seconds was to soak a rag in gas and stick it in the top of the carb. So go for the carb and you should do fine.
Don't throw your stock carb away, a propery built Aisin(stock) carb will beat any weber/holley. I don't think that its your carb or anything. I would think that for some reason when the fuel tank is full a vacuum is being created inside the tank. I would fill it up and drive it about a mile, then I would open the gas cap and if you hear a sucking noise then you know there is a vacuum in the tank.
Jesse
Jesse
Tank may not be venting when full because of filler neck placement. If neck comes out side of tank and filler neck is near flat it still wont vent through cap. You wiil have to vent through top of tank somehow. If it has or had a return line no problem vent with it.
Throwing your Aisin away is the worst advice I've seen here in a long time. First of all, a rebuild kit is $20. Second, the Webers and Holly's are notorous for off-camber issues. Also, you're looking at hundreds of dollars to fix something which you haven't diagnosed yet.
Finally, if it needs a rebuild and You can't get it right, just send it to Jim Chenowith and you'll get back a top-notch unit.
Finally, if it needs a rebuild and You can't get it right, just send it to Jim Chenowith and you'll get back a top-notch unit.
CruisinGA said:
That's way too simple. I'll bet he won't try it!