Well I failed emissions testing 2 times. The first time I took my truck I passed everything but the evaporative line test to the charcoal canister. They stick a line in my tank that pressurizes the tank and check for pressure at the charcoal canister. There was no pressure. That weekend I got under the truck and started looking around and trying to pressurize the tank. To make a long story short I found a "T" on the line that was covered with plastic to keep pressure from going thru and then I found the same thing on the the top of the front tank. I then pressurized the tank and there was flow to the canister. I then took the truck to get emissioned again. Now I failed the fuel cap pressure test. All the pressure escapes to the charcoal canister so there is no build up.

There is suppose to be a 1 way check valve on the tank so no fuel escapes if the truck is upside down. I just bought the truck so there was no mention of why the previous owners may have done this. Plus they live in a non emissions city so the didn't give a F.

Can someone confirm any of this and possibly help me find parts and or part numbers. I have all data but I've been looking everywhere for check valves and I find ****. TIA!

1995 F150 302.

 

Where the hell do you live? I'm not moving there.

 

Arizona. It's not to bad here compared to California.

 

Up for some info.

 

God bless your Governor!!!!!! I hereby promise to visit my brother in Yuma & leave as many tourist dollars as I can afford. You guy's rock! Think about it. A little state like Az. taking the first real in taking back our country!!!
I'm so proud of you guys! x2 You guys have a 50% approval rating in "Newest" New Mexico (California), and w/ a 60% hispanic population, that's not easy! I'll go look at my 87' 302 today and see if I can find something (short of dropping tanks). Are you using the ratchet down gap caps & are the seals on them in good shape? From what I've read, this test was added expressidly to weed out older vehicles to bump them off the road. Sounds like maybe a rotted vent line. Plug the canister return line, pressurize the tank & listen for leaks. the more ears the better. Can't find it at Alldata? It's a little hard to navigate, but it should be there under fuel delivery or emissions. A line T's at the first tank, one line to that tank? one line to rear tank? one line to where?

 

so glad i llive in 'bama.- no cats? no problem!

 

Nebraskaland is quite nice too.

 

Sorry to reply back late but I usually use my iphone when online and typing long replys back is no fun. This law is stirring quite a contraversy. I rather not get started on it right now. This tread would turn into something else.

I've been doing alot of checking. No service writters seem to know what is right. I talked to one and they said the roll over valve is suppose to close when it gets to a certain amount of pressure but how is that suppose to happen? Pressure doesn't build that fast to close a valve. I checked my rollover valves and they're fine.

There are no leaks in my lines. I tested from my charcoal canister to the t fitting for both tanks. Pressure builds and comes back out the line because it can't go anywhere else.

So that brings me to what the second service writter said. He told me that the charcoal canister is suppose to hold the pressure. I blocked off all holes including the caps and it did hold but once I put the caps back on they didn't. So I bought a new canister and caps thinking this was the problem. I tested it and it did the same thing the old one did. The caps aren't solid so it doesn't close the hole off totally. I'm guessing incase to much pressure builds it can go somewhere. So other then that I'm stumped. I'm just thinking if I plug the holes in the charcoal canister I'll pass but I'd really like to know what I'm missing.

Do any of you have anything else between the t from the tank to the charcoal canister? Purge valve, anything? I don't and in all data it shows a purge valve but doesn't show the location. The purge solenoid is after the canister so its not the problem but regardless it stays in the closed position when off I've already checked.

So problem is after the t for the fuel tanks and before the canister. If possible can someone take a pic of their charcoal canister line. I'd like to see if theres a valve that I'm missing. Thanks everyone!