Gas Tank Questions

[AMC86Kid]

So after i took off the bed i looked at the gas tank and i wanted to learn what all the parts on it are 

 

whats this part called and how do you remove it ?

 

 

also what are these two hoses on the top of the tank for ?

 

 

[mikekaz1]

The big one on the side is your sending unit (fuel pump) you remove it by spinning that small retaining ring with the small edge standing straight just to the inside of those nubbies.

 

The two small ones on top are your expansion/evap/rollover valves tat let the tank "breath"

 

FYI don't break that sending unit, they don't reproduce them.

[AMC86Kid]

so do i turn it clockwise to tighten it and counter clock wise to losen it ?

 

also i get that the tank needs vent holes but why are they connected to hoses and where do the hoses go to ?

[johnj92131]

You should buy a factory service manual!  It is full of great diagrams and everything you need in the way of instructions to take things a part and put them back together correctly.  Not being a smart a**.  The factory service manual is an essential tool if you are going to work on your old truck.  The only alternative is to pay a good shop a bunch of good money!

 

Now, without looking at my service manual, I think the hoses go to the fuel evaporation canister for vapor recovery.

[ParadiseMJ]

^{The vents are routed by the rubber tubes to a T to one hose.  Then they continue on to a short metal tube that run up the firewall, and  then connects to another rubber tube that connects to your charcoal canister.  The vacuum from the intake manifold sucks the fumes back through the intake tp burn off.}

^{If you feel like replacing them, they're $25 a pop at the dealer.  The plastic parts get old and fall apart after awhile...the nipples break off.}

[AMC86Kid]

Ok see I don't have vapor canister so can I just disconnect the hoses and leave it connected to nothing ?

[mikekaz1]

yes but you will get the smell of gas on hot days

[Eagle]

so do i turn it clockwise to tighten it and counter clock wise to losen it ?

 

also i get that the tank needs vent holes but why are they connected to hoses and where do the hoses go to ?

 

Yes. The retaining ring has three ears on it that you tap with a punch to loosen and tighten it.

 

CAUTION: You're working on a gasoline container. The fumes are explosive. The FSM (Factory Service manual) says to use a BRASS punch to avoid sparks that can set off an explosion.

[AMC86Kid]

ok i will try to open up the gas tank safely 

and i will try to figure out a clever thing to do with the vent holes 

can i just plug up the vent holes or is that a major no no 

[johnj92131]

Gasoline expands and vaporizes as it gets warm/hot. Arizona summer temperatures can get close to 120F.  If you seal the vents, pressure inside the tank will build and you can force gas out the fuel filler when your tank is full.  Potential fire hazzard at worst.  A fuel spill potential at minimum.  I sure do not want to spill gasoline in my garage on a hot night. Even here in San Diego.  Too many potential ignition sources, starting with the water heater

 

Personally, I would take the evaporative system off a Cherokee and use that on my Comanche.  There are a number of good size pick a part yards in the Phoenix area.  As a bonus, the pick a part yards offer the chance to learn by taking somebody elses car a part.  If you break something, no harm to your truck.

[AMC86Kid]

ok i will try to run the evaporation lines to a safe area 

[64 Cheyenne]

ok i will try to open up the gas tank safely 

and i will try to figure out a clever thing to do with the vent holes 

can i just plug up the vent holes or is that a major no no 

 

My question is, why do you have to remove or open the tank? Is there an issue with it, or are there going to be when your done? Let sleeping dogs lay...?

If it was me, I wouldn't be messing with the sender if the sender and pump are still working properly. If you gotta open it up...are you gonna put a NEW MOPAR pump back in it?

And a NEW O ring, Mopar has a lock ring and O ring kit I'd suggest you use when you reassemble.

And Merry xmas all

[AMC86Kid]

i wanted to make sure its clean inside and then i wanted to paint the gas tank so when i put the truck back together 

everything looks all nice and clean 

[ParadiseMJ]

 

and i will try to figure out a clever thing to do with the vent holes 

can i just plug up the vent holes or is that a major no no 

 

No, don't plug the holes.  Why don't your just get a canister and do it right??

 

Did you ever buy an FSM? Get one for Xmas?

[AMC86Kid]

i just use the FSM that i found posted online whats wrong with that one ?

[mikekaz1]

I think the point of the matter is, nobody wants to be "that douche" as this is an area for helping and expanding knowledge of a common thing we all find a liking too. but many, MANY, of the questions and threads you've brought up can be pretty easily found using simple Google searches on their own rather then "wasting" everybody's time and effort.

[buckwheat]

AMC86kid: Try the following next time you have a question. go to Google and type in "site:comancheclub.com" followed by the keywords you are interested in. Then read the first five links that come up. If you do not find your answer by that point in time, feel free to start a new thread.

 

You have asked some good questions, but as stated, a LOT of your questions could be answered by searching the interwebs a little bit.

 

Keep going and keep asking, just try and do some research first.

[AMC86Kid]

i get what you guys are saying but maybe you guys don't understand why i even started posting  

on some of my posts i don't know what it is or what to do with it so i ask you guys   ( for example the brake control leveler in the rear, i had no clue what that was for )

but on many of my posts i feel like i pretty much have a good basic understanding of what to do 

its just i would feel more confident if i asked you guys just to see if you agree with what I'm thinking

ive learned that a lot of times someone who is older and a lot more knowledgable has already done what i have attempted 

and it makes jobs so much easier when someone tells you what you have to do before you do it and gives you hints or tips 

haven't you guys ever worked on something for your vehicle then after you finished it read a post of the very same thing and said

"oh i wish i had read this before i did it on mine"

all I'm doing is trying to prevent that ( wish i knew before i started feeling )

I'm the type of person that likes to know exactly what i have to do before i do it

I'm not sure why but thats just the way i am 

and one last note ever time i posted i felt like i was helping the forum out because i usually always post a pic or two 

so i was thinking that all the info and the pics that i posted helps out other people and other posts because they can reuse my same pics 

if you guys want i can make a educational DIY on how i fixed this or how did i restore that with tons of pics and good info since I'm fixing the whole truck anyways 

also sorry if any of you feel like i was wasting your time that wasn't my intention 

[ParadiseMJ]

 

 

 

No, don't plug the holes.  Why don't your just get a canister and do it right??

 

Did you ever buy an FSM? Get one for Xmas?

 

i just use the FSM that i found posted online whats wrong with that one ?

 

Nothing is wrong with that one, and I didn't think you were wasting my time.  The FSM will, however, be able to answer most of the questions like, ":where does it go" etc.  Faster for you.  Us forum browsers (me anyway) feed off being able to answer some of the questions you've asked.  The FSM can't give you some of the "tips" that some of these guys can though.

[mikekaz1]

not bashing ya bud, theres no such thing as a stupid question. and knowledge is knowledge.

[HOrnbrod]

if you guys want i can make a educational DIY on how i fixed this or how did i restore that with tons of pics and good info since I'm fixing the whole truck anyways

A lot of the questions you ask have already been written up in the DIY forum HERE.

 

Check it out first. And yes, good write-ups with lots of pics and explanations are always welcome in this forum.

[AMC86Kid]

yes i have looked at many the DIY's on the forum (i would say around 50 of them) 

but a lot of them i feel don't explain the process of what they did thoroughly enough

so after i read it, it leaves me with questions in my head 

 

i will give you an example:

http://comancheclub.com/topic/14466-broken-door-hinge-welds-cheap-n-easy-fix/

 

i have to fix the sagging door on my driver side so i looked at this DIY

they guy says that the door fell off so he cut out the hole and cleaned up the welds on the unibody 

but how should you remove the door if its cracked and sagging but still half connected to the unibody ?

should you just bend the door up and down till it breaks off that way you can ensure that you clean up all the warped metal on the unibody ?

or should you cut the welds off with a cutting disc or a plasma cutter ?

i agree that making an new internal bracket is the way to go but how does he know where exactly to rebolt the door hinge ?

and also it looks like the bracket is bolted on but you can see the other side so how did he tighten the nuts on the other side of the bracket 

did he just weld them on the back side of the bracket and then the bolts would be able to self tighten at that point ?

 

i also looked at this post and i really disslike the external bracket so I'm going to go with the method above 

http://comancheclub.com/topic/26948-busted-door-hinge-repair/

[shelbyluvv]

Unbolt your door and cut the hinge off the body with a cut off wheel. I did this fix years ago and my truck is doing just fine. My door actually fell off so I know the fix works. As far as there not being enough information in the DIY???

 

You're on your own there. I found the write up very thorough and detailed.

[64 Cheyenne]

If you aint askin questions, you aint participating and you arent learning. And I don't care whether you use "search" or not, just happy to see so many enthusiasts,

If having to read repetitive posts is a time waster, don't open the page, don't read it, and what the hell you wasting "YOUR" time here for anways if your time is too precious to read somebodys thread that might be mundane to you, but might be of much importance to the person who really needs help to fix their truck.

[johnj92131]

yes i have looked at many the DIY's on the forum (i would say around 50 of them) 

but a lot of them i feel don't explain the process of what they did thoroughly enough

so after i read it, it leaves me with questions in my head 

 

 

Nothing wrong with having questions.  Even after reading a DIY article.  It is natural to have questions about things you have never done before or using tools you know nothing about.  Everything we learn new depends on having a foundation of previous learning.  DIY articles require some basic foundation knowledge.  It doesn't matter if it how to fix a car or how to find a book in a library, if you lack the foundation knowledge, it is a difficult process to fathom.  So don't be afraid to ask questions about what you don't understand.  But, please do try to ask specific, detailed questions. 

Questions like "Why doesn't my truck run?" will not get to the root of the issue.  But if you say "My truck doesn't run after I ran out of gas, how do I find/fix the problem?"  You will get better answers like:  "Change the fuel filter, you may have picked up crud from the bottom of your tank that is blocking your fuel line."  Even that answer "assumes" that you had enough knowledge to put several gallons of gas in the tank before you tried to restart the car.