pineapple_tree

So, I had my Jeep on the lift today to install new shocks, and I decided to take a look at that broken line, and it does indeed lead to a T fitting, and it’s been completely disconnected, and the other line is degrading fast. I also sniffed the line and I could clearly smell that gas smell.

What i’m going to end up doing is let it get below half and drop it down enough to access the rollover valves, put new lines in place of the old ones, all the way up into the engine bay to the EVAP canister.

I originally had no idea that my Jeep even had EVAP, I thought it was too old for it. I then later found out that it had been standard in most vehicles for a long time before my Jeep was made, and I thought that one degraded line was some sort of atmospheric vent, which isn’t true at all.

cruiser54

Yup. Even us old blind squirrels find a nut sometimes.

pineapple_tree

I have no idea what that blue wire goes to. It was pinched between the frame and a shock bolt (that broke), and I followed it up to the fuel lines in the engine bay and lost sight of it.

And yes, that other line is kinked. So pretty much my EVAP canister isn’t really even hooked up, which would explain some weird problems I have when i’m filling up.

Actually, speaking of that, maybe this is why my gas gauge is “inaccurate”. For example, if i’m at half a tank according to my gauge, sometimes I can fill up 12-14 gallons, other times only 6-7 gallons at the same “half tank” reading.

I also think it’s messing with calculating my gas mileage, because I once took a 3 hour trip on the highway and only got 18 MPG, but then after I filled up I somehow ended up getting 38 MPG driving in the city back home.

Anyway, I might have time tomorrow to fix it. I’ll update with what I used and if it fixed any of the weird problems at the pump

Rogue4x4

38 mpg? Did you think that was legit?

Using unicorn **** instead of gasoline?

pineapple_tree

I wish. But this thing isn’t a Prius.

Old Man Minimalist

Good idea to check and repair everything that is needed at once. Even if the old lines weren't leaking yet, just being old and cracking is enough to replace them.

One of my policies is that when I am working on something in the vehicle, anything that I "touch" to facilitate the repair gets refurbished along with the repair. If I have to do something like drop the tank, anything around the area gets worked on. Exhaust heat shield, receiver hitch, skid plate, etc..

robsjeep

Note that a disconnected evap system can allow water to enter the fuel tank, in addition to being a fire hazard. Until repaired, park outside and do not top off the tank. a full tank can cause spills as gasoline can expand a good deal when warmed.
I have old cars with no evap system. top the tanks off with cool gasoline from an underground tank, then let the car heat up on a sunny day of 90F and I get a puddle of gas under the car as the vent vents with no provision for recovery.
After repair, consider using fuel dryer to remove any water that may have entered the tank via the busted hose.

good luck keep a jeepin.

pineapple_tree

Yeah, I used to top off the tank up to 3 gallons more when the nozzle clicked. Now that I know what that broken hose is, i’m genuinely surprised that it never once overflowed. That’s why I think I under fill the tank at the pump and it throws off how I calculate my gas mileage.

Anyway, once I get all of those rubber lines replaced, I do plan on using some fuel treatment or dryer to get most of the water out of the fuel.

cruiser54

Make sure to get line for evap/fuel.

Fjord

How would the amount indicated affect your calculation? If you record miles driven and volume of gas filled that's your mileage right there. I guess if you're assuming the amount filled is the spec tank volume that would throw you way off?

pineapple_tree

Kind of. I fill up to one click, and I think having a broken evap line and one that is kinked is altering when that “klick” happens, so therefore if i’m reading half a tank, fill up 12 gallons, and I drove 200 miles, then it would be 16 and a half MPG. But if I fill up at half again the next time, it can be greater or less than that, even though I always fill up at half a tank.

I know something is off, because now that I know what that line belongs too, because if i’m really at half a tank, and i fill it up 10 gallons, and then put in 2-3 more, then it most certainly would come out of that rollover valve.

We’ll see if anything changes when I get the lines fixed

pineapple_tree

Does anyone happen to know what size the line is? I’m thinking maybe a 1/4 inch, but I want to know for sure before I drop the tank and fix the lines.

I also do have some fuel line at work, but the selection is pretty limited