Over the last couple of weeks there have been multiple threads identifying some weaknesses in the Evo X's fuel delivery system. The threads below are the ones I found for both the Fuel Pump Relay going out and the fuel pressure regulator vacuum line popping off, both of which can cause a potentially catastrophic lean condition at WOT (I believe AMS had this happen). Starting this thread to house both of these issues in one place.

Threads pertaining to Fuel Pressure Regulator Vacuum Line:
http://www.evoxforums.com/forums/showthread.php?t=18803
http://www.evoxforums.com/forums/showthread.php?t=18366

Thread for Fuel Pump Relay:
http://www.evoxforums.com/forums/showthread.php?t=17957

Update: New Fuel Relay part number thread:
http://www.evoxforums.com/forums/showthread.php?t=18949

Updated by TRUSTcompany9000

Alright, sticky-ed. Thank Dino.

I had the relay issue, glad my X survived.

I had the relay issue, glad my X survived.

I've had the hose pop off on mine. Also swapped relays pre-emptively just to be sure.

Zip tied my hose before I found the relay issue just as a CYA

my hose is on real tight. I checked last night

So Joey, what you are saying is you were tugging on your hose last night?

yeah......I tugged it pretty good......wait.....I mean......fuck it

if i was already tuned and had my car logged do i still need to worry about this? (because the tuner would have seen an abnormally lean condition) or is this the type of thing that could just go at any time?

would mitsu replace this faulty relay?

would mitsu replace this faulty relay?
sure, they should under warranty. The real headaches begin if your motor blows because of that issue

Edit: Yes, it can go at anytime. As long as you have a wideband, you'll spot it, but if you don't you might get yourself if some hot water if it goes and you don't catch it.

sure, they should under warranty. The real headaches begin if your motor blows because of that issue

Edit: Yes, it can go at anytime. As long as you have a wideband, you'll spot it, but if you don't you might get yourself if some hot water if it goes and you don't catch it.

so if i just go in to mitsu, would they replace the relay before it goes. or would they only replace it after it becomes defective.

also, im tuned, do you think they would deny replacing it because of this.

i dont have a wideband so i would much rather have mitsu replace it so i dont have to worry about it.

so if i just go in to mitsu, would they replace the relay before it goes. or would they only replace it after it becomes defective.

also, im tuned, do you think they would deny replacing it because of this.

i dont have a wideband so i would much rather have mitsu replace it so i dont have to worry about it.
if the relay goes and it blows your motor, they will probably blame to tune instead of the relay and that's when the trouble starts. And they will not replace it until it goes out. The relay should be cheap tho, so you can just keep a spare in the car...

is there a better aftermarket relay?

Can someone possibly show a pic of these two items in the engine compartment? I'd like to do the zip tie as a precaution....

The relay should be cheap tho, so you can just keep a spare in the car...
:yeahthat:

This is one of those things where you are better off biting the bullet and buying a spare relay. Even though it is a design goof up on Mitsu's part, you'll regret not having a new relay if yours goes bad and you suffer major engine damage.

Can someone possibly show a pic of these two items in the engine compartment? I'd like to do the zip tie as a precaution....

:+1: where's the fuel pressure regulator?

:+1: where's the fuel pressure regulator?

Its a silver round piece on the left side (as you're standing in front of the car looking at the engine) of the fuel rail.

Ok, back to the relay issue. I have read several threads on this now. There still seems to be some confusion as to the best course of action.

1. Check the relay and replace if necessary with the same black relay.
2. Buy a another black relay just in case the first one fails
3. Replace the black relay with another black one now-precautionary
4. Replace the black relay with a green one like the three that are in there now for the starter, injectors and I forget what else.

Anyone know if the green relays are definately better than the black? And I'm still unclear to what a failed relay feels like when driving the car?

Any help appreciated.

JDM EvoX Recall ~~> Most likely coming to a Mitsu Dealer Near You!

Mitsubishi Japan just ordered a recall on the EvoX. I thought for sure it'll be the fuel pump relay but it turned out to be the fuel line & connector in the engine bay.

Mitsubishi just posted pictures on their website. Check this site (http://recall.mitsubishi-motors.co.jp/Recall/displayselect.do?orderno=12365) and scroll to the bottom where there are 2 pictures of the engine. Look at the fuel return line outlined in blue. The left picture is before the recall and the right picture is after the fix. As you can see, they added 2 additional brackets for the fuel return line. If yours doesn't have the additional brackets, then I'm pretty sure you will get a recall also.

This recall is to prevent possible fuel leakage from the fuel return line.

http://img01.carview.co.jp/minkara/blog/000/014/856/587/14856587/P1.jpg

http://blogs.cars.com/kickingtires/2009/09/recall-alert-2008-2009-mitsubishi-lancer.html

Here is the recall info

dang It might be just for the americas market, I havent heard of any recalls in Japan or Australia/New Zealand

any actual pictures of this hose coming off.

Good Stuff :thumbup:

Moved to Evo X Engine.

subscribed! thanks :thumbup:

any actual pictures of this hose coming off.
I did not take a pic when I noticed mine had come off. Just picture the hose sliding off the little nipple on the intake manifold

Great...fuel issue #2 :(

1st and second links are to the same FPR vacuum line issue, should edit in the fuel lines to rail recall link: http://www.evoxforums.com/forums/showthread.php?t=19150&highlight=fuel+pump+relay

EDIT: just realized it was posted on post #19

added link to New Fuel Relay part number to first post.

I found that for my car, the hose doesn't completely go all the way to the bottom... Doesn't look to be firmly connected... should I go about pulling the hose all the way down then zip tie it? It's too hot to touch now.

Apologies for the weird angle.

I found that for my car, the hose doesn't completely go all the way to the bottom... Doesn't look to be firmly connected... should I go about pulling the hose all the way down then zip tie it? It's too hot to touch now.

Apologies for the weird angle.

Hell yeah, that looks like it ready to come off!

guys i just had the car on the road for a couple of hours... i got tuned in september for high 10`s and 11`s under WOT which i was holding in any gear with some early 12s at worst... (all these months no worries)
all day today i was letting the throttle off as my car would hit 10`s and then quickly climb and i would let off at 13`s when the wideband still goes up....
and at idle my wideband registers 17`s and sometimes even does not register as opposed to my usual high 15s...
is my fp relay out.....
i talked to meat_evo earlier and he told me to drive the car and make sure it is not the weather conditions.. but this evening i kept on driving and it turned mild 51 degrees outside... the situation didnot change...
i am pretty sure i lean out like insane both in idle and under WOT...
my question is?
relay?

Swap it with the highbeam or horn relay and check your wideband.

bump.. anyone with suggestions..

I found that for my car, the hose doesn't completely go all the way to the bottom... Doesn't look to be firmly connected... should I go about pulling the hose all the way down then zip tie it? It's too hot to touch now.

Apologies for the weird angle.


my looks exactly like yours...

is this a problem or can i zip tie it now?

So i just got a evo 2010 gsr last month i called my dealership and talked to the parts department and they said that they havent heard of thsi issue and to continue using the black one that came with the car. I also talked to the parts department and had them look up the part #'s and they do carry the blue relay.. not sure if i show upgrade or not when they are saying not too and they havent heard anything about it.. there charging 45 bucks for the relay out here since its hawaii and all.

i just replaced my relay with the blue one tonight, got it from mitsubishparts.net

and my FPR hose blew off last week, fixed it tonight.

sigh

I call my dealer ship and They told me the fuel pump relay part number that was showing up in the system was 8627A024 which is different then the one the horn relay. I'm going to go take a look at it today.

my pressure relief valve popped off of my tank while rear seat cushion was out. fuel sprayed all over interior, put zip ties over it, havent had problems since.

and we thought we had it bad?

http://wheels.blogs.nytimes.com/2011/04/01/vw-recalls-2011-jettas-in-which-horn-can-make-engine-stall/?src=mv

and we thought we had it bad?

http://wheels.blogs.nytimes.com/2011/04/01/vw-recalls-2011-jettas-in-which-horn-can-make-engine-stall/?src=mv

no wonder they sell those things for so cheap!!

I was having a problem with this relay working intermittently when I first got the car. I just pulled the relay and jumped terminals 30 and 87. Haven't had a problem since, and that was about 10,000 miles ago.

Some people worry about the pump and fuel getting too hot running full voltage all the time, but as long as you aren't running the tnak nearly empty for long periods of time i doubt there will be any problems with overheating of the fuel or pump. Heck on the supras we run twin walbro 255s at full voltage all the time and never have any problems with them.

-Darin

I was having a problem with this relay working intermittently when I first got the car. I just pulled the relay and jumped terminals 30 and 87. Haven't had a problem since, and that was about 10,000 miles ago.

Some people worry about the pump and fuel getting too hot running full voltage all the time, but as long as you aren't running the tnak nearly empty for long periods of time i doubt there will be any problems with overheating of the fuel or pump. Heck on the supras we run twin walbro 255s at full voltage all the time and never have any problems with them.

-Darin

Makes sense to me, may just do this for peace of mind....