rarebmx

iTrader: (6)

First off, I am new to this site and this is the only 3rd gen site I am a member of. I do appreciate the knowledge base here and have read through several articles and threads in the last couple weeks and even before I joined. So thank you all! With that said:

I have an 89 5.7 TPI IROC. I purchased it about 2 weeks ago. When I bought it, the Charcoal canister had hoses off, one plugged with a stick and the car ran rough or it has a cam installed (someone may have done this since the car looks with some of the decals, that someone wrenched on it). When I took the stick out of the canister and ran the car, gas would come out, so I know for a fact now that the canister had fuel in it and maybe a 1/4 gallon of gas would spew out after the car was turned off.

I downloaded the vacuum line diagrams and bought a charcoal canister from an 87 5.0 TPI car. I installed it, since all the lines seemed to be correct according to the diamgram except for one very small hose going no place. After doing so, the leak has now gone to the filler tube, so I am thinking I have a vented gas cap (see picture).

From what I can see after looking over the engine and TPI there is still a hose plugged (see picture). Why is this plugged and what should be there, or where would it go?

I am wondering if the fuel regulator was changed to an adjustable one? Is it so simple to add a non vented gas cap? Did someone change the fuel pump and not put the lines back exactly right?? The car has no hesitation on throttle but now will not stay running very long but will idle for about 2 minutes... once the vacuum lines were routed correctly... meaning the first night I drove it home, no issues except for gas spewing once I shut the car off. Wasn't overly excited with that setup of gas pouring out near the monifolds. Now it will only stay running if I give it gas (pedal it) the whole time if I drive it. I am perplexed and just have owned the car now for 2 weeks now. I have had lots of other cars and understand how to fix them pretty easy but this one is confusing me. Any help is sure appreciated and if I need more details to give to help firgure out the situations please don't hesitate to post that too.

This was taken care of and a pretty straight car. I will clean under the hood once I feel I can drive it to the carwash for a steam clean. I just want it "right" and no vacuum lines capped off or items taken off just because they are there (Charcoal canister). I want the canister still since there is no benefit removing it other than a little weight. This is not a daily driver but just one for the garage and nice days.

Thank you.

RBob

iTrader: (1)

It may be that the fuel pump was replaced and the vent (CCP) line and return lines got reversed. This is somewhat common as it is hard to tell them apart once the tank has been dropped.

The return line being further down into the tank the has fuel spilling out the canister line. Blow air into the large CCP vent line at the canister, remove the gas cap and listen for bubbling. If so, then it is attached to the return line at the tank.

Also, pull the carpet up behind the rear seat. A common 'thing' is to cut a hole there to replace the fuel pump.

As for the gas cap look at the inside of it. It should be solid, no holes or such.

RBob.

rarebmx

iTrader: (6)

Thank you for the reply. That is what I suspected happened. It makes perfect sense. The question now is: if the case is, that they are switched, is that what is making it not idle or stay running with it in gear? Is there a vacuum building up and the ECM or MAS trying to compensate?
I am going to take it to a shop, since I don't have time to get to it myself. Would trying to drive it just be plain stupid like this?

rarebmx

iTrader: (6)

I still am wondering 3 things: And update, sealed gas cap

1. where is a link to how to swap fuel pump. Hopefully it is not as hard to get to as my Vette.

2. Would these lines not running right affect how the car is running?

3. Where is the capped off vacuum line supposed to go?

Hopefully I get some response. I did a search for fuel pump replacement but found nothing on it as of yet. I heard from a shop 4 hours labor to fix lines and exhaust needs to be dropped as well as suspension?? Seems a little like BS.

camarosrock1989

iTrader: (1)

Yes the exhaust needs to be dropped as well as suspension, 4 hours is a good estamated time. I had a guy do mine said would take about 5 hrs, he did it in 3 1/2 which is pretty fast. As far as the gas spewing out of the gas cap area mine and many other guys on this site are having some of the same problem with fuel heating to boiling point. Funny thing is as the weather gets cooler, it does not happen anymore. I know you have a few other answers your looking for, iam not qualified to answer. But hopefully someone will post something up for you. I will try to find a few threads that might help you.

camarosrock1989

iTrader: (1)

Here is a link that might be helpful. There are a few others that might be other links attaced in this thread.
https://www.thirdgen.org/forums/tpi/...regarding.html

RBob

iTrader: (1)

The lines are can be accessed without dropping the tank.

As far as accessing the fuel pump, first check under the carpet behind the rear seat.

RBob.

Z06 FAN

I have the same small hose going no place. I have also benn having issues with gas leaking at tank and charcol canister aswell....driving me nuts. Can someone confirm if the line is to go nowhere and just be left open.

rarebmx

iTrader: (6)

Thank you and went by today and took a look... Not there, but the buildsheet was... Thank you!

rarebmx

iTrader: (6)

I have a feeling now, that the gas that was coming out was left over. I let the car run (as well as it would) for a while today with no issues OTHER than idle issues.... I took a video and uploaded it to youtube. 1 is taken right when I first sarted it, the other is about 20 seconds after I stopped the other. Issue now is IDLE... what causes this issue? I am making progress with your guys help.

videohttp://www.youtube.com/watch?v=snYcgIa_jt4

Second video after 20 seconds

http://www.youtube.com/watch?v=6ytTTB7UL20

rarebmx

iTrader: (6)

I haven't had issues for a while, then pulling the car out of the garage today and a trail of gas behind me. Shut it off, got out my books and pretty sure the lines were reveresed. I have driven this car for a few hours since having new injectors, distributor, control module and no real issues other than poor mileage and gas smell.
Now, I did get under the car today and reversed the two lines to see what affect it would have. No gas leaking now but doesn't it need to build up again? I have done numerous reading through other threads on this and no one seems to have any answers. My question is: if they are reveresed what is the casue and effect? I can always switch them back but want to drive the car and see what is up. When it drips, it does back by where they cut the tubes. Worried about driving it with gas leaking without knowing it. I drove it around for about 2 minutes today and nothing but doesn't men it can't happen at any moment.
Here is what my lines looked like.

rarebmx

iTrader: (6)

UPDATE: just drove the car for about 30 minutes, let it idel and run for almost an hour. Then I see the drip again back by the drivers rear tire. Can this be left over gas? The car does idle and run better after switching the lines OR can it be the little valve on the canister that is bad? This gas should not be dripping no matter what. Return line possible but not vapor line. It is one or the other after switching them. Please help.... My Haynes and Chilton don't cover this.

TTOP350

iTrader: (8)

Just a FYI, thats not a build sheet. Its a broadcast or mini build sheet for the rear of the car. there is one used in the front, interior and the rear hatch area.
And there is one for the whole car.

rarebmx

iTrader: (6)

Thank you, yes, I was kind of excited until I found out what it was. The build sheet is more than likely still in the drivers seat.

Brando5641

iTrader: (-1)

sub. I want to see what you figure out on this.

rarebmx

iTrader: (6)

I finally figured out that in the rear of the car two lines had been crossed - the vent line and return line. All solved now. Thank to the help of the forums.

TBRays98

I know this is an old thread but im having the same exact problem can you post a picture of how the lines are suppose to routed? I think i might have reversed my lines as well when i did my fuel pump.

BG1959

iTrader: (4)

Rehashing an old thread again. I've been dealing with this issue myself for quite awhile. Anyone have a pic of which line is which from underneath the car without having to drop the tank would be appreciated.