strabge problem, need help

[diego355]

Hello everyone

So here its the thing, saturday I decided to go camping with some friends. After driving along dirt roads and a couple of super easy trails we found a great camping spot.
The 80 was loaded with camping gear and people. We parked to unload but I didnt shut off the engine because we needed light and we were enjoying some music. After 10-15 min it smell a lot like gasoline and when i went to check out the gas cap, gas was poring out. A friend opened the gas cap and lots of gas and vapors came out, after a couple of sec it stop. The engine shut down and the next day when i tried to start it it wouldn't hold idle.
I adjusted the accelerator cable in the throttle body and it started fine but with a bit of high revs and now the accelerator pedal sticks to about 1500rpm and I have to reach under the pedal to unstick it.

A bit long but i wanted to explain exactly how it happen

My fuel punp and filter was replaced almost 2 months ago

 

[CJF]

Two separate problems.

1) I have no idea bout the gas tank pressure issue (which sounds serious and dangerous, BTW), but...

2) You obviously overtightened your throttle cable; give it some more slack.

 

[jcope]

Would a clogged charcoal canister cause the gas pressure issue?

 

[kidglove13]

Do a search

There have been quite a few threads about high gas tank presssure

 

[kidglove13]

https://forum.ih8mud.com/80-series-...ank-pressure.html?highlight=gas+tank+pressure

 

[diego355]

Ill check the throttle cable tonight and see if that solves the accelerator sticking which makes sense. The other thing is that the next day after starting the 80 the rpms were fluctuating in a really small range, I adjusted the accelerator pedal at 750 rpms and the needle was not constant at 750, it would be bouncing between 700 and the 750.
Im taking it to the shop next Wednesday and I sort of want to have an idea of whats is the problem and not get ripped off replacing things I don't have to

 

[jonheld]

OK. Adjusting the accelerator cable was your first mistake. That's not how you set idle speed. Idle speed is set by the ECU telling the ISC valve how much to open. However if your off idle as sensed by the TPS because your cable is too tight, the ECU has no freaking idea what the hell is going on.

The proper setting of the accelerator cable is to make sure that it is at wide open throttle when you have the pedal to the floor without pulling too much on the throttle itself. With the pedal floored the throttle should be just touching the end stop.
With the pedal released there should be a touch of slack in the cable and the throttle should be at the other end stop.

Very basic system here.

 

[jwilber]

Not to be a bearer of bad news but do a compression and leak down test. That same sort of thing happened to me and was the start of a long lasting problem I've had with my 80.mine started to over heat and when I pulled over had the gas smell. Pulled the cap and gas came our and killed the truck. Found I had blown the little hose off the tstat housing .truck never ran right again. FFWD 8 months blew my head gasket, when I took the head in guy said it had a small hairline crack in the head he said might have been there a while. My guess when it over heated.

 

[diego355]

OK. Adjusting the accelerator cable was your first mistake. That's not how you set idle speed. Idle speed is set by the ECU telling the ISC valve how much to open. However if your off idle as sensed by the TPS because your cable is too tight, the ECU has no freaking idea what the hell is going on.

The proper setting of the accelerator cable is to make sure that it is at wide open throttle when you have the pedal to the floor without pulling too much on the throttle itself. With the pedal floored the throttle should be just touching the end stop.
With the pedal released there should be a touch of slack in the cable and the throttle should be at the other end stop.

Very basic system here.

I adjusted it quickly because we were out in the trails about 150km from home and thunderstorm coming our way. Ill try my best to adjust the cable the proper way today also inspect lines.
Im not very familiar with fuel systems but it seems to me that if there is too much pressure on the tank and the engine shut down means that a line or a valve is clogged

 

[CJF]

Read the thread kidglove linked for you, especially the first and last pages. That's your issue.

 

[diego355]

Ok so reading through the thread I didnt came up to a conclusion other that is a problem that it happens when a combination of hot weather, altitude, and low speeds where there is not too much air cooling those fuel lines.
Now what it should happen is that when I properly adjust the throttle cable, my 80 should be fine and hold idle like every day.
Originally I thought it was a problem related to the pump but its good that it isn't. If I adjust the cable and it is still not holding idle we have a problem

 

[CJF]

Again:

Two separate issues: One is the cable, the other is the charcoal canister.

After reading that thread, you don't agree the charcoal canister caused the pressurized tank?

 

[diego355]

The thing is that the next day it didnt happen with the exact same conditions, it was even hotter that the day it happen
Does anyone would have the part number for this charcoal canister? Doing a quick search its looking around the $300s and i just called a dealership and they said $800 WTF

 

[kidglove13]

There is a thread about someone who used a canister from another vehicle that was cheaper.

 

[jbsax]

CP1018 is the part number. Mine is made by BWD. It's for a Pontiac grand am, I think. Less than $40 at Pep Boys. O'Reilly price matched. Easy fix.

 

[diego355]

Thank you guys, another thought on the subject. Overfilling the gas tank would lead to this problem? The charcoal canister would fill or get some liquid fuel inside or being the gas tank filled with more of its capacity at those temperatures it would expand too much making the canister not work properly?

 

[kidglove13]

Yes I do believe that over filling could cause this problem

I think that the 80 is very sensitive to overfilling for some reason

When I fill up I stop after the first click off and do not try and top it off

I do beleive that others have had similiar issues do to over filling, I think

 

[diego355]

OK so today I filled up the tank and drove to work no problem. It seems that the problem with the canister apears when we tend to overfill the tank. I work at a Subaru dealership and talking to the techs seems to be that there is no need to replace the canister right away. Ill get the Pontiac one that was suggested before and keep it as a spare. I really dont want to spend $400 for a oem one if I dont really need it.

Does the Pontiac one works with the 3FE or the 4.5? It seems to be different

CP1018 is the part number. Mine is made by BWD. It's for a Pontiac grand am, I think. Less than $40 at Pep Boys. O'Reilly price matched. Easy fix.

 

[Flank]

strabge?

 

[CJF]

strabge?

At least they're next to each other on the keyboard. ;p