So I have a 04 Blazer 2 Door LS 4x4. Had a problem with fuel filling. Cut an access hole to do the fuel pump because the gauge was being erratic. Found out the pump had already been replaced once. As further inspection noticed the fuel vapor hose coming off the tank vent to canister was pinched shut. Lowered the tank and tried to fix it. Ended up having to replace hose. Blew out all lines and even blew out charcoal canister as this aided in the same problem I had with my mercury Replaced hose between filler and tank thinking that may have been it since it was also collapsed. Put it all back together and still nothing. SO.... is the fuel tank vent valve stuck shut. I blew into that with compressed air and the tank expanded which makes no sense since the filler neck was removed... wouldn't the air have escaped through the fill hole? Now here is the problem. If this vent is stuck shut.. How do I find a replacement being that all the ones I have found are for a 4 door model. Seems like its a bastard vehicle. Plastic tank with a vent that has 2 nipples. One going to the canister and the other to the pump itself. Im lost. and im sure as to looking at the same issues using the search there have been posts with others asking about the same vent and NEVER getting answers.

 

So the one listed at RockAuto for a 2004 Blazer does not appear to be plastic, but what would be wrong with using a metal one....as long as the hose connections are the same?

Agree makes no sense that blowing air into the tank pressurized it unless the fill hole was completely covered. The vents are one way valves...let air out only.

 

the problem with it would be the plastic one has a vent valve up by the fuel pump. with 2 lines going to it. the new steel one doesnt. so what am i supposed to do with those two line.

 

 

posted a picture of what mine looks like thought thats not mine. so yea the steel tanks wont work.

 

Sure is odd that the metal one does not have a plug-in vent. Does your plastic tank have the two hose connections like the metal one? (reference picture at rockauto)

 

nope only has one nipple at the filler hole and then the vent up by the fuel pump. its best to find a oem tank but like i said that vent is molded into the plastic and if im wrong someone needs to say so with proof. too many posts on this same problem with over hundreds of views but no input.

 

Questions: on the plastic tank....does the larger hose connection of the two from the molded-in vent go up to the filler?
Then does the smaller vent hose connection go to the canister or does it goes up to the engine?

When you removed the vent from the tank...what does it look like around the vent?

In the description of the metal tank there is a statement, "w/o pan in tank"....do you know what this means?

 

I do not know what " with out pan means" and yes one big hose from vent nipple to canister and the other is a small hose from nipple to fuel pump. again plastic tank has a vent by pump that is molded into tank. metal tank does not. so a metal tank will never work. im done with it. im going to rig it up and sell it. never going to find a OEM plastic tank... and if found probably wouldnt be worth it.

 

I sure understand.....not being able to get a replacement part.....not many choices.