Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

Fuel pump problem


  • Please log in to reply
22 replies to this topic

#1 Oldeman

Oldeman

    New User

  • Members
  • Pip
  • 8 posts
  • Corpus CHristi, Texas

Posted 17 January 2004 - 07:46 PM

My first post, just found this forum.
I have a 92 Sub Loyale wagon that has a problem that nobody can seem to cure so I'm turning here for help.
95 % of the time, it starts just fine, BUT for some reason it will sometimes not start due to the fuel pump not activiting. After it sits for a few hours, it'll start just fine. When it doesn't start I can't hear the fuel pump. After sitting for awhile, I turn the key on and I hear the fuel pump pumping and it starts and runs just fine.
I've had the car for several years but this just started a few months ago and I've taken it to several mechanics and they just scratch their heads.
On a side note, the "check engine" light will come on after a mile or so, sometimes it glows steady and sometimes it flashes.
It has about 133,000 on the clock, carries great oil pressure, runs great AFTER I get it running.
I would appreciate any help that any of you can give me.
Thanks

#2 Subafreak

Subafreak

    User Awaiting Email Confirmation

  • Members
  • 863 posts
  • Central Village Ct.

Posted 17 January 2004 - 08:19 PM

Have any of them tried changing the fuel pump or the fuelpump relay? Thoes would be easy places to start.

#3 TomRhere

TomRhere

    Certified BRAT nut!!!

  • Members
  • 3,956 posts
  • Hillsdale, Mi. USA

Posted 17 January 2004 - 08:25 PM

Sorry, I can't help you, '92 is a bit to new for me.

Just wanted to welcome you to the board.

I'm sure one of the Subaru Guru's will be here shortly to give you some directions on this. Lots of good people here, and some good info is to be found.

Would suggest doing a search for fuel pump related threads, as this is something we all suffer from at one time or another. The search function is at the top right hand side of the pages, just incase you may have missed it.

Again, Welcome to the Board.

#4 Oldeman

Oldeman

    New User

  • Members
  • Pip
  • 8 posts
  • Corpus CHristi, Texas

Posted 17 January 2004 - 08:37 PM

I really appreciate the quick responses.
I have checked the fuel pump by direct wiring it and it worked fine. I bought a Chilton book on it and inspite of reading it several times, I still can't find the relay. I found two relays under the hood passenger side. Both the same so I swapped them, no difference. It's driving me nutter than it already has.
Thanks.

#5 baccaruda

baccaruda

    YOUR FAVORITE MOD

  • Moderator
  • 6,941 posts
  • SpoVegas, WA

Posted 17 January 2004 - 09:54 PM

you could always wire in a new relay off the coil.

#6 v8vega215

v8vega215

    USMB Regular

  • Members
  • PipPipPip
  • 111 posts
  • Portland, OR

Posted 17 January 2004 - 10:00 PM

on most sube's and most japanese imports the fuel pump is wired in with the alternator circuit or the oil sending unit so those could also cause your fuel pump to not run if they are intermitantly bad.

#7 Subafreak

Subafreak

    User Awaiting Email Confirmation

  • Members
  • 863 posts
  • Central Village Ct.

Posted 17 January 2004 - 10:15 PM

Hmm? The only thing I've seen with the F.P. wired through the oil pressure switch is GM's. And I don't think the Loyals will kill the pump if the Alt isn't charging, I think that ended with the old GL/DL's. The fuel pump realy should be near the computer under the steering colume, I think its the round relay but I can't be sure right now.

#8 Oldeman

Oldeman

    New User

  • Members
  • Pip
  • 8 posts
  • Corpus CHristi, Texas

Posted 17 January 2004 - 10:43 PM

I have gotten under the dash several times and I can only find one relay and according to the Chiltons, there should be two there. As I said, it is driving me nuts, may drive me back to drinking. <G>
Thanks folks. I may try running a wire direct from the coil to the pump, bypassing that @$$%$# computer. As you might have guessed, I HATE computers, probably because I play (?) with them everyday. Is there a cable available to interface with my laptop that will tell me EXACTLY what is wrong???
Thanks again

#9 GoldDiggerRoo

GoldDiggerRoo

    Pizza anyone?

  • Members
  • 565 posts
  • Roanoke, VA

Posted 18 January 2004 - 12:43 AM

I had this prob on one of my 84's. I made a harness for it and hooked it directly to a toggle switch. Makes a handy theft detternt device! :D

#10 calebz

calebz

    Andys Coupe killed my cat

  • Administrator
  • 7,547 posts
  • Tacoma

Posted 18 January 2004 - 03:51 AM

The fuel pump relay and the ignition relay are directly above the ECU. Loosen the 3 nuts that hold the ECU. Its not necessary to remove them. Then drop the ECU down . Right above the left hand side of the ECU is where they will be located. If you aren't sure what the look like, I will take a pic of one tomorrow and post it.

#11 rallyruss

rallyruss

    Subaru Master

  • Members
  • 1,653 posts
  • San Jose CA

Posted 18 January 2004 - 04:18 AM

some subes dont use a relay for the fuel pump.
92 loyale does though. it powers up both the fuel pump and the coil acording to my diagram. wiring off the coil will not help if the problem is on that circuit. it would however make trouble shooting a bit easyer. check for power at the coil + when it wont start. this could be the relay or the driver in the ecm. this has been a problem on some subes.

#12 Oldeman

Oldeman

    New User

  • Members
  • Pip
  • 8 posts
  • Corpus CHristi, Texas

Posted 18 January 2004 - 12:05 PM

calebz, thanks for that info and no, I don't know what one looks like and would like a pic of one.
rallyruss, I'm not sure where it powers from but it does try to start when the fuel pump is not working. I can use ether and get it to run. I thought about holding a plug wire when trying to start it but that might be too shocking. <G> Not to mention that my arms are not long enough.
GoldDiggerRoo, I already have a theft prevention switch that won't let the starter work when activated but it is a good idea.
Thanks for all of the good ideas and help.

#13 GoldDiggerRoo

GoldDiggerRoo

    Pizza anyone?

  • Members
  • 565 posts
  • Roanoke, VA

Posted 18 January 2004 - 12:24 PM

Good, it's a handy thing to have. Funny story, my dad's cousin bought a '83 or '84 Brat new. One night it was stolen and when it was found later the next day it was parked with a flat tire and a full tank of gas.... when it was stolen it was on dead empty. Now that's justice! :D

#14 rallyruss

rallyruss

    Subaru Master

  • Members
  • 1,653 posts
  • San Jose CA

Posted 18 January 2004 - 01:42 PM

rallyruss, I'm not sure where it powers from but it does try to start when the fuel pump is not working. I can use ether and get it to run.



ok I dont quiet get what you are saying here.

the ecm turns on the relay, the relay gets its power from the fuse, the relay turns on the coil and the fuel pump.

so if this were the problem it would not try to start at all. I think we are barking up th wrong tree.

it could be as simple as a bad fuel pump.
sometimes when pumps get a bad spot on the armature the will intermitantly not run. or a crappy connection could do this too. the FP wiring goes up under the rear seat, along the right side of the car up under the dash at the right kick pannel.

trust me I have been in your shoes before.

#15 Oldeman

Oldeman

    New User

  • Members
  • Pip
  • 8 posts
  • Corpus CHristi, Texas

Posted 18 January 2004 - 02:49 PM

rallyruss, I think that you have given me the idea that I need.
As I said, when it doesn't start because the FP isn't pumping, I can run a hot wire to the pump and it runs so that kind of rules out the pump being bac or having a bad spot because even after I run it with the hot wire, it still won't pump until it gets good and ready.
I've checked the fuses in the kick panel, drivers side, and these are all good. That kind of narrows it down to the relay or a fuse that I can't find or (God forbid) the ECU. Do you think that I am right in my thinking?
Thanks

#16 Subafreak

Subafreak

    User Awaiting Email Confirmation

  • Members
  • 863 posts
  • Central Village Ct.

Posted 18 January 2004 - 07:35 PM

I belive the ECU relay powers up the fuel pump relay. So you would still have spark but the FP relay could still be bad.

#17 Oldeman

Oldeman

    New User

  • Members
  • Pip
  • 8 posts
  • Corpus CHristi, Texas

Posted 18 January 2004 - 09:31 PM

That is what I'm thinking. Tomorrow I will disassemble the car until I find that relay. Hopefully, the nice guy that said he would post a pic will do so, that way I will know what I am looking for.
I will keep everyone posted on my progress and cure.
Thanks again

#18 calebz

calebz

    Andys Coupe killed my cat

  • Administrator
  • 7,547 posts
  • Tacoma

Posted 19 January 2004 - 12:47 AM

Here Ya Go
Posted Image

There are 2 relays located above the ECU just to the left of the steering colum. One is for the ignition, one if for the fuel pump. They both look like the relay in the above pic.

#19 Oldeman

Oldeman

    New User

  • Members
  • Pip
  • 8 posts
  • Corpus CHristi, Texas

Posted 19 January 2004 - 03:50 PM

celebz
Thanks for the pic, now I know what I am looking for.
Priced one at the dealer this morning and about had another heart attack, $44+. Do you have any idea where I might find one cheaper????
Now I have to go out and find the relay see if MAYBE the contacts are dirty.
I'll let you know if I find it and if I can fix it.
Thanks to everyon

#20 calebz

calebz

    Andys Coupe killed my cat

  • Administrator
  • 7,547 posts
  • Tacoma

Posted 19 January 2004 - 04:43 PM

PM me your address.. I have 3-4 of them here.

Where in Texas are you?

#21 Oldeman

Oldeman

    New User

  • Members
  • Pip
  • 8 posts
  • Corpus CHristi, Texas

Posted 25 January 2004 - 04:00 PM

Just an update, I found a relay locally and put it in just now. Seems to work better but only time will tell.
When I first went out to work on it, it started just fine but the other day it started for about 10 seconds and then died, hadn't tried again until today.
That relay was a bugger to get to, shed some blood. Those engineers need to work on their cars after they design them. I'd bet that they would design them to be easier to work on.
I thank all of you for your help, I couldn't have done it without you help.

#22 Cougar

Cougar

    Elite Master of the Subaru

  • Members
  • 6,340 posts
  • Anchorage

Posted 25 January 2004 - 04:34 PM

I also welcome you to the board Oldeman.

Your cars wiring should have some colored plugs near the ECU that you can use to troubleshoot with. They may be green and also black. When you plug one of the sets together it will do certain test proceeds. Your ECU may also have a LED you can read the stored codes from. Your manual should cover the operation of the way the proceedures work.

One thing that can happen to kill the FP operation is if you loose the CAS signal. If the ECU or FP control box (depending on the model) does not see that signal it will turn power off to the pump. Hopefully you will have no more problems now that the relay has been changed out. You can also swap relays if they are the same color, to do some future testing.

#23 calebz

calebz

    Andys Coupe killed my cat

  • Administrator
  • 7,547 posts
  • Tacoma

Posted 25 January 2004 - 09:53 PM

Cap'n,

I'm glad you found some relays locally. The ones I sent you came back friday with 'undeliverable address' stamped on them.

Heres a link for more info on ECU codes
http://usmb.net/repa...e9.39782181.art




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users