vent type cap

[computerboy]

I am new to this tractor stuff so this might be a dumb question. I have a TC25D and the operator's manual says the fuel cap is a vented-type. When I take the cap off a gust of air/pressure is released. What is a vented-type fuel cap, and should it be doing this?

Could this be causing the problem I have had twice where my tractor runs out of fuel, but the fuel gage shows a quarter and a half of fuel in the full tank? My dealer is going to come out and look at this problem in the next week.

Thanks for all your help

 

[Phred]

Computerboy,

Is it pressure realesed or air rushing in? Could it be that the machine is some how building a vacuum up inside the tank and you realese when you open the cap?

I recall that on some cars if you replace the gas cap with a non venting cap (and it is supposed to be a vented cap) you can get similar behaviour.

Also my policy is to never go below 1/4 tank on any car, truck or tractor I own. Its easier on the fuel pump.

My two cents....

Fred