Fuel Tank vaccum unable to vent

[wbdavid]

Today the check engine light came on, in my 1999 Explorer sport I took it to Advanced Auto they hooked up the code reader ( didn't give me the code number but said it was for fuel tank vaccum unable to vent.

He said he had never heard of it before anyhione know what this is or how to fix it?

 

[Birdy]

Really need the code # because different people interpret codes differently. I would not venture to guess there may be something wrong with the vent valve not actually knowing if it was even a circuit mentioned in the code. I assume he read it and told you in his own words.?

 

[wbdavid]

Took it to Autozone they gave me code P1450 Inability of Evaporative Emission Control System to Bleed Fuel Tank. They couldn't tell me what causes it either.Not having much luck figureing this out.

 

[Birdy]

http://www.explorerforum.com/forums/showthread.php?t=300357

Try looking at this.

 

[wbdavid]

Ok I looked at that did the whole blow out the lines. Cleared the code bought a gas cap because alot of poeple on other sites and the other guy said it helped, and because mine seamed loose even when I tightened it as much as I could. 2 weeks later it came back code 1450 so I cleared the lines again useing compressor. bought a new vent solinoid and a new purge valve solenoid put them on cleared code. now only 2 days later code is back yet again. What else can this be? do I need a new canister?

 

[Turdle]

OK, here are a few things to check.

When the code is displayed, go crack the gas cap. See if the tank is actually under pressure.

It might be that the Fuel tank pressure sensor ( mounted to the fuel tank) doesn't "see" a change in pressure.

This could be due to a hole in the fill or vent tube, or, maybe even faulty wiring to the sensor.

 

[Birdy]

Maybe possible the guts of the canister are getting sucked into the system and plugging it up. When you clean the lines is there stuff in it? Also, you should be able to take the hoses off the canister and blow through the canister pretty easily. Maybe the canister is plugged up. I don't thinks there's much left to be wrong.

 

[wbdavid]

OK, here are a few things to check.

When the code is displayed, go crack the gas cap. See if the tank is actually under pressure.

It might be that the Fuel tank pressure sensor ( mounted to the fuel tank) doesn't "see" a change in pressure.

This could be due to a hole in the fill or vent tube, or, maybe even faulty wiring to the sensor.

I did remove the gas cap the first 2 times dose not seam to be any preasure. definatly not excessive.


Maybe possible the guts of the canister are getting sucked into the system and plugging it up. When you clean the lines is there stuff in it? Also, you should be able to take the hoses off the canister and blow through the canister pretty easily. Maybe the canister is plugged up. I don't thinks there's much left to be wrong.


did not seam to be much if any I did it on a fairly dirty parking area did not see any thing. I am thinking I need a new canister then.

 

[koda2000]

In areas that salt the roads in winter, it is not uncommon for the metal fill/vent lines to develop pin-hole leaks where the metal pipes connect to the rubber lines to the fuel tank. This happens because of the angle of the connection between the metal and rubber lines, water can be trapped between the two, causing corrosion at the connection. It might be worth checking this area.

 

[wbdavid]

A few more things to check if we don't get the blizzard tonight. If we do I will have to wait till it thaws. Thanks you all.