Resolved Evap/egr system/fuel filler setup

[roadtrip_69]

Does anyone have a diagram of what all the connections do on the gas tank of a 98-99 fwd gst. I know the tank is setup differently than the 95-97. ( I have a full Mitsubishi shop manual but can't find any real details on the tank itself or the lines coming off the fuel filler)

I removed all egr/evap from my engine bay years ago after my engine build but never touched the gas tank area.

But recently I started having issues getting gas into the tank. As if pressure was building up and kicking off the gas pump.

Dropped the tank today and took off the fuel filler setup. I removed a bunch of lines and hoses. Only leaving the vacuum line directly above the fuel inlet in the tank and the main fuel inlet hose. Deleted everything else.

I know one of the connections in what I think is the charcoal canister ( has 3 connections 2 on the outside are slightly bigger than the one in the middle) .. goes to the fuel pump shutoff system in case of roll over. But the 2 additional connections, one coming from the fuel filler setup, and one going towards the engine bay. But there's also one connection all by it self on the driver's side of the tank I capped it off. But not sure if this will cause any issues. Not sure which of the 4 hose lines are a vent for the tank? If any are?

Started the car and it runs fine but just concerned on too much pressure building in the tank? Haven't tried filling the tank back up as of yet either. Have like 4 gallons in the tank currently.

Thanks

 

[luv2rallye]

It's on p13C-4 of the real Mitsu service manual volume 1.

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[roadtrip_69]

It's on p13C-4 of the real Mitsu service manual volume 1.

Interesting in

It's on p13C-4 of the real Mitsu service manual volume 1.

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Hey thanks!!! I'm missing that whole section in my copy of the manual. Sigh. Mine goes from 13-a to 13-f. Not to mention the odd typo... anyway can you send me that whole section? Explains my frustration on not being able to find it.

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[luv2rallye]

My manual is the paper version of the real 1999 Mitsubishi Eclipse/Spyder Service Manual Volumes 1, 2, and 3 (3 books) from Mitsubishi Motors itself that I bought when I bought my 1999 Eclipse new [https://www.ebay.com/itm/256014480319?hash=item3b9ba6f3bf:g:xe4AAOSw0UdXvyzQ&amdata=enc:AQAIAAABAKwDv45JuIIwEge5gORIkopiFjHD3niWBMOzkXmzojYYP9acBsdXITCm30ywvudFmA7mKd0zwr8IG2Q9NR/kLm1Qd70+lxeurADtOsvg9v5xp6bxDXFWNMOTSZKzOIiTYQJHkCmU0giGnOW06YDrRjJtEasbOwAql/RnlzzBc6V2mLwQF+7nbWN1lnRjm+Eikupb/0F3V7/2Wa5Rtp7Xt3ySqBOUp4al8dgcOAyWgezESbggih6hCs3iwPTB8fPZz6rmvZhTV2K1Ivm/dBaoJQq/zGy0P+I+Wn/208pD0g/C+HLDrXJhCQClbUDjXcCATkRpdr90q80xw3DTYr0ZPNQ=|tkp:Bk9SR_jTzMGsYg]. So I can't send you it.

Online 2g manuals I've seen are always for 1995 or 1997 (but falsely claim 1997-1999) which have different fuel tank setups (along with a few other areas that I've noticed are different than in the actual 1998/1999 Eclipses). Also, fuel tank setups and evap systems are different whether you have a Federal or California Eclipse as well as the year and model.

Here's some manuals you might try but as I've said I haven't found one that matches my 1999 GST fuel tank hoses and a few other things (only my real 1999 Mitsu paper ones do). EBay also has the real Mitsubishi manuals.

DSM Maintenance Guide

You have a factory turbocharged DSM so, of course, you want to go fast. Before you do there are several maintenance checks you will want to run through. These cars have an unfair reputation of being unreliable in other circles - much of that reputation is due to new owners throwing on a boost...

www.dsmtuners.com

MediaFire

MediaFire is a simple to use free service that lets you put all your photos, documents, music, and video in a single place so you can access them anywhere and share them everywhere.

www.mediafire.com

Index of /dsmbooks

Here's my take on manuals: https://www.dsmtuners.com/threads/help-could-it-be-oxygen-sensor.129479/#post-151396369.

 

[roadtrip_69]

Does anyone have a diagram of what all the connections do on the gas tank of a 98-99 fwd gst. I know the tank is setup differently than the 95-97. ( I have a full Mitsubishi shop manual but can't find any real details on the tank itself or the lines coming off the fuel filler)

I removed all egr/evap from my engine bay years ago after my engine build but never touched the gas tank area.

But recently I started having issues getting gas into the tank. As if pressure was building up and kicking off the gas pump.

Dropped the tank today and took off the fuel filler setup. I removed a bunch of lines and hoses. Only leaving the vacuum line directly above the fuel inlet in the tank and the main fuel inlet hose. Deleted everything else.

I know one of the connections in what I think is the charcoal canister ( has 3 connections 2 on the outside are slightly bigger than the one in the middle) .. goes to the fuel pump shutoff system in case of roll over. But the 2 additional connections, one coming from the fuel filler setup, and one going towards the engine bay. But there's also one connection all by it self on the driver's side of the tank I capped it off. But not sure if this will cause any issues. Not sure which of the 4 hose lines are a vent for the tank? If any are?

Started the car and it runs fine but just concerned on too much pressure building in the tank? Haven't tried filling the tank back up as of yet either. Have like 4 gallons in the tank currently.

Thanks

My manual is the paper version of the real 1999 Mitsubishi Eclipse/Spyder Service Manual Volumes 1, 2, and 3 (3 books) from Mitsubishi Motors itself that I bought when I bought my 1999 Eclipse new [https://www.ebay.com/itm/256014480319?hash=item3b9ba6f3bf:g:xe4AAOSw0UdXvyzQ&amdata=enc:AQAIAAABAKwDv45JuIIwEge5gORIkopiFjHD3niWBMOzkXmzojYYP9acBsdXITCm30ywvudFmA7mKd0zwr8IG2Q9NR/kLm1Qd70+lxeurADtOsvg9v5xp6bxDXFWNMOTSZKzOIiTYQJHkCmU0giGnOW06YDrRjJtEasbOwAql/RnlzzBc6V2mLwQF+7nbWN1lnRjm+Eikupb/0F3V7/2Wa5Rtp7Xt3ySqBOUp4al8dgcOAyWgezESbggih6hCs3iwPTB8fPZz6rmvZhTV2K1Ivm/dBaoJQq/zGy0P+I+Wn/208pD0g/C+HLDrXJhCQClbUDjXcCATkRpdr90q80xw3DTYr0ZPNQ=|tkp:Bk9SR_jTzMGsYg]. So I can't send you it.

Online 2g manuals I've seen are always for 1995 or 1997 (but falsely claim 1997-1999) which have different fuel tank setups (along with a few other areas that I've noticed are different than in the actual 1998/1999 Eclipses). Also, fuel tank setups and evap systems are different whether you have a Federal or California Eclipse as well as the year and model.

Here's some manuals you might try but as I've said I haven't found one that matches my 1999 GST fuel tank hoses and a few other things (only my real 1999 Mitsu paper ones do). EBay also has the real Mitsubishi manuals.

DSM Maintenance Guide

You have a factory turbocharged DSM so, of course, you want to go fast. Before you do there are several maintenance checks you will want to run through. These cars have an unfair reputation of being unreliable in other circles - much of that reputation is due to new owners throwing on a boost...

www.dsmtuners.com

MediaFire

MediaFire is a simple to use free service that lets you put all your photos, documents, music, and video in a single place so you can access them anywhere and share them everywhere.

www.mediafire.com

Index of /dsmbooks

Here's my take on manuals: https://www.dsmtuners.com/threads/help-could-it-be-oxygen-sensor.129479/#post-151396369.

Fair enough. And yeah I have downloaded multiple versions of the Factory Service manual from this site, and as you have said, they all may say 97-99 but they seem to be more based on the older/original 2g then the later model. But until now its never been that critical. I also have the full ALL DATA disk, which i was actually able to find that same diagram/picture you sent me. And after realizing its the evap system thats primarily back there, I found that section as well (which is also apparently missing from my FSM.

All that said though, its not every helpful on my current issue. I put it all back together with all 3 EVAP Charcoal Canister outlets capped. And the Leveling Valve Assembly (8) Capped. With only the main fuel fill line and what appears to be the fuel Cut off valve assembly (7). Still connected. I removed the Liquid Separator Assembly (19) and both Vapor hoses. But I still can not get Fuel into the tank. It just fills up the filler tube, slowly drains into the tank. Takes like 10 minutes to get it to go from empty to fuel at the pump. Its annoying to all hell.

Does the section I'm missing have any trouble shooting how to's on this issue? Or does it (or you) know what the Leveling Valve Assembly.. do? Should I uncap it and let it breathe?

Appreciate the time! I've literally rebuilt my engine by hand and probably replaced 75 percent of all my drivetrain over the years but this has me stumped!

JT

 

[luv2rallye]

Well you must have a blockage, or a stuck valve, or a vent line capped or not connected properly (vent line needed to vent the tank air that the added fuel displaces to allow the fuel to enter swiftly).
Sorry I don't know what the various valves and other tank things are for any more than guessing by their names (which you can do too).

I see you've found "https://www.dsmtuners.com/threads/gas-wont-go-into-tank.445773/#post-153890730".
Did you also see "https://www.dsmtuners.com/threads/2gnt-cant-fill-tank-i-knew-this-would-happen.526859/" which may also provide some clues.

 

[luv2rallye]

Here's how to test various fuel tank valves and some brand new fuel filler tube pics (in case they help).

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[BLACK'98DSM]

As I stated in another thread, the issue is that you've capped off the leveling valve. It allows pressure in & out of the tank. Without this functioning you are relying solely on the filler neck breathers, which are too small to exchange pressure quickly during a tank fill.

The 3 ports in the center of the fuel tank will have no effect as a breather because they are part of a sealed canister that sits within the fuel tank, as a separate assembly. If you were to block anything off I would remove this assembly and block it's opening. It's a fairly heavy assembly. It's not worth dropping the tank for this alone but it sounds like you'll have to anyway to reverse what has been done with the leveling valve.

 

[roadtrip_69]

Hey thanks everyone, the leveling valve was the issue it appears, I just have it open with a short hose at the moment though(I had had it capped with a big bolt clamped on the end), thinking of getting a filter of some kind to put on it, just to stop anything from getting into the tank that shouldn't. I also already bought a filter for the filler neck "center" vent/line (theres 3 on the 98-99 apparently), the other 2 combine into a 1 way valve it looks like that then goes straight to the tank above the fill hose.

The other problem I discovered is the small vent right at the filler, there's black "button" that opens/closes that center air line, thats supposed to spring out when the cap is off, and then go in with the cap on. While its just stuck in cause the spring doesnt do anything any more. I thought for sure that was the issue but since it is such a small air way, it makes logical sense the leveling valve is the real problem. Just wished they labelled it in the manual something more obvious.. like "RELIEF VALVE"

I will be installing the small filter this weekend and look into what size to get for that leveling valve after that.

I was finally able to get a full tank of gas!!!, which might be the fullest it's ever been, which then presented a new challenge, I found a leak on the top of the pump assembly hanger.

If it's not one thing.. it's another. . I have a busted stud, I had tapped when I had the tank off years ago, that has since stripped out I guess due to all the on and off of the pump assembly lately. I got it tight enough that it doesn't seem to be leaking at this moment, but I'll need to go back and clean up the threads and get a new bolt once I run through the tank, it's really only a potential issue when the tank is full or near full.

Anyways thanks all!.