Welcome to the North American Subaru Impreza Owners Club Saturday July 4, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Pre-2002 Factory Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 11-28-2012, 08:27 PM   #1
fxt05
Scooby Newbie
 
Member#: 208521
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
'96 STI Type RA
'05 FXT

Default Fuel Pump Issue?

I have an EJ20G type ra swap which has the coil conversion and running an sti takeoff pump.

It has been running great for the year and a half i've owned it. Just the other day i was driving down the road to get some dinner, not boosting anywhere and the car started stuttering then died.

I looked at my fuel gauge and had a 1/4 of a tank so i figured maybe the gauge was becoming inaccurate. I coasted into the gas station and got a few gallons of gas and it started up fine. I started my drive home and it was running fine then started stuttering again. so i parked it in my garage.The next day i took it out for lunch and made it there ok then almost home it started stuttering again.

its been sitting the last couple days and today i started it up. it warmed up fine with no problems. it rev'd fine with no problems. I started driving it and no problems. i've been thinking this is probably my fuel pump so i figured i would have a problem as soon as it hit boost so i pressed the peddle a little bit to build some boost and it stuttered and died. after that i cranked it and it wouldn't start for a couple minutes. limped it home and parked it in the garage again.

Sorry for the long post everyone but what do you think is going on here? i figured i would get some opinions before ordering a fuel pump.

Thanks in advanced.
* Registered users of the site do not see these ads.
fxt05 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 11-28-2012, 09:04 PM   #2
eg33GC
Scooby Specialist
 
Member#: 206851
Join Date: Mar 2009
Chapter/Region: MWSOC
Vehicle:
56 Belair
Pro Street

Default

It's not entirely out of the question, but your filter may be at equal fault.

A 255 is a hundo, a filters $20. Just do em.
eg33GC is offline   Reply With Quote
Old 11-28-2012, 09:11 PM   #3
fxt05
Scooby Newbie
 
Member#: 208521
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
'96 STI Type RA
'05 FXT

Default

I just picked one up. The filter on the car is just over a year old or so but I'll swap it and report back.
fxt05 is offline   Reply With Quote
Old 11-28-2012, 09:36 PM   #4
fxt05
Scooby Newbie
 
Member#: 208521
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
'96 STI Type RA
'05 FXT

Default

Well I'll be a monkeys uncle...


Thanks for the input I was about to order a pump. I would have never thought a filter would have affected things so bad.
fxt05 is offline   Reply With Quote
Old 11-28-2012, 09:41 PM   #5
eg33GC
Scooby Specialist
 
Member#: 206851
Join Date: Mar 2009
Chapter/Region: MWSOC
Vehicle:
56 Belair
Pro Street

Default

carry on with your amazing valvetrain
eg33GC is offline   Reply With Quote
Old 11-28-2012, 09:49 PM   #6
fxt05
Scooby Newbie
 
Member#: 208521
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
'96 STI Type RA
'05 FXT

Default

Lol. I'll try to enjoy it again. Thanks again for the simple fix.
fxt05 is offline   Reply With Quote
Old 12-04-2012, 07:17 PM   #7
fxt05
Scooby Newbie
 
Member#: 208521
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
'96 STI Type RA
'05 FXT

Default

Well that only lasted a minute. Car started dying at idle and trying to die on decel. I thought it might be a good idea to restart the ecu after the filter Change in case that was causing any problems and now im back to square one. Car idles and revs fine but won't drive under load.
fxt05 is offline   Reply With Quote
Old 12-04-2012, 07:52 PM   #8
fxt05
Scooby Newbie
 
Member#: 208521
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
'96 STI Type RA
'05 FXT

Default

Just check fuel pressure after the filter cause its really the only easy place to check. With the key on before starting it was 30 psi. After I started it pressure dropped to 28-29 psi. This seems really low to me. I thought I read it should be something like 36 or 38 at idle.

Is it time to swap the fuel pump?
fxt05 is offline   Reply With Quote
Old 12-04-2012, 08:45 PM   #9
fxt05
Scooby Newbie
 
Member#: 208521
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
'96 STI Type RA
'05 FXT

Default

So about 29 psi at idle, unplugged vac line to for the fpr and it rises to 40 psi. I read it should rise to 43 psi. I don't know if that means the fpr is bad or I'm just getting low pressure to begin with. Or does all of this sound OK and I need to look elsewhere?
fxt05 is offline   Reply With Quote
Old 12-04-2012, 10:28 PM   #10
Stangy
Scooby Newbie
 
Member#: 329676
Join Date: Aug 2012
Chapter/Region: E. Canada
Location: Canada
Vehicle:
1999 GC8 R-STI
White

Default

Should be 43.5psi or 3 bar if I'm not mistaken.
Stangy is offline   Reply With Quote
Old 12-04-2012, 10:36 PM   #11
fxt05
Scooby Newbie
 
Member#: 208521
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
'96 STI Type RA
'05 FXT

Default

That's what I thought also. Think the regulator may be on its way out? That looks like a real pain to change out.
fxt05 is offline   Reply With Quote
Old 12-05-2012, 10:05 AM   #12
Stangy
Scooby Newbie
 
Member#: 329676
Join Date: Aug 2012
Chapter/Region: E. Canada
Location: Canada
Vehicle:
1999 GC8 R-STI
White

Default

Super easy change. relieve fuel pressure. Grab a few rags. Disconnect the vacuum line then the regulator. Swap new one in, replace vac line.

Remember that your fuel pressure is 3 bar (43.5 psi) above manifold pressure. Her eis an example. The pressure on the supply side and the the manifold side of the injector are different. Here is a good example. If rail pressure is 44psi and you are at WOT the pressure in the manifold will be very close to atmosphereic so the delta across the injectors is 44psi. Not this is the part people get confused. When you go into boost the manifold might be a 20psi. Well the rail pressure has to be at 64psi to maintain the 44psi basic fuel pressure. The same is true when the manifold is in vacuum. The rail pressure will drop because the manifold has less than atmospheric pressure.

Your pressure is showing 40psi. Aslong as its between 40-43 it is fine. Your problem is likely elsewhere.
Stangy is offline   Reply With Quote
Old 12-05-2012, 10:09 AM   #13
Stangy
Scooby Newbie
 
Member#: 329676
Join Date: Aug 2012
Chapter/Region: E. Canada
Location: Canada
Vehicle:
1999 GC8 R-STI
White

Default

I would look at your coils- check connections. Check your spark plugs. Check for injector leaks and injector connections.

Fuel pump would not fail then work 30min later then fail again. It would just fail once.
Stangy is offline   Reply With Quote
Old 12-06-2012, 02:45 PM   #14
luciferMotorCade
Scooby Newbie
 
Member#: 253611
Join Date: Jul 2010
Chapter/Region: NWIC
Location: the couve
Vehicle:
2004 GeNOME
WRB

Default giga dee

Jeremy quit crying . I have 4 good coil packs at your house . We will start at the coil packs and spark plugs then go from there.
luciferMotorCade is offline   Reply With Quote
Old 12-06-2012, 03:47 PM   #15
fxt05
Scooby Newbie
 
Member#: 208521
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
'96 STI Type RA
'05 FXT

Default

What I don't understand is why it started running great again right after changing the fuel filter then less than 20 miles later it was running like crap again. Unless the tank is all of a sudden so full of crap it clogged the filter up again.

Last edited by fxt05; 12-06-2012 at 10:38 PM.
fxt05 is offline   Reply With Quote
Old 12-07-2012, 08:44 AM   #16
Stangy
Scooby Newbie
 
Member#: 329676
Join Date: Aug 2012
Chapter/Region: E. Canada
Location: Canada
Vehicle:
1999 GC8 R-STI
White

Default

Might need a tank clean?
Stangy is offline   Reply With Quote
Old 12-07-2012, 11:15 AM   #17
luciferMotorCade
Scooby Newbie
 
Member#: 253611
Join Date: Jul 2010
Chapter/Region: NWIC
Location: the couve
Vehicle:
2004 GeNOME
WRB

Default

here's an idea.... IF after we check the gas/tank. we check the cat pressure before and after it? Dwayne's buddy had the same issue and had surgeline put new cats in. That fixed his problem.I know a new dp and what not is expensive right now but we can test it. just need somebody to put small tack welds were we drill to pressure test the cat..
luciferMotorCade is offline   Reply With Quote
Old 12-07-2012, 11:29 AM   #18
Stangy
Scooby Newbie
 
Member#: 329676
Join Date: Aug 2012
Chapter/Region: E. Canada
Location: Canada
Vehicle:
1999 GC8 R-STI
White

Default

Quote:
Originally Posted by luciferMotorCade View Post
here's an idea.... IF after we check the gas/tank. we check the cat pressure before and after it? Dwayne's buddy had the same issue and had surgeline put new cats in. That fixed his problem.I know a new dp and what not is expensive right now but we can test it. just need somebody to put small tack welds were we drill to pressure test the cat..
This is true. Totally overlooked that. Had this same problem with my built 2.016vt VW. Couldent figure it out. Was CAT.
Stangy is offline   Reply With Quote
Old 12-07-2012, 11:36 AM   #19
luciferMotorCade
Scooby Newbie
 
Member#: 253611
Join Date: Jul 2010
Chapter/Region: NWIC
Location: the couve
Vehicle:
2004 GeNOME
WRB

Default

Quote:
Originally Posted by Stangy View Post
This is true. Totally overlooked that. Had this same problem with my built 2.016vt VW. Couldent figure it out. Was CAT.


16vt?????? MK1? mk2?
luciferMotorCade is offline   Reply With Quote
Old 12-07-2012, 11:53 AM   #20
Stangy
Scooby Newbie
 
Member#: 329676
Join Date: Aug 2012
Chapter/Region: E. Canada
Location: Canada
Vehicle:
1999 GC8 R-STI
White

Default

i have built the following!

Mk1 Rabbit 16vt (Fully built and restores w/Precision 6031)
Mk1 Cabriolet 16vt (Fully built and restored w/gt28rs)
2004 Golf 1.8t (Mild Build w/gt 3076)
1991 VW Scrocco VRT (Fuilly built track car w/hybrid gt series turbo)
Stangy is offline   Reply With Quote
Old 12-07-2012, 11:54 AM   #21
Stangy
Scooby Newbie
 
Member#: 329676
Join Date: Aug 2012
Chapter/Region: E. Canada
Location: Canada
Vehicle:
1999 GC8 R-STI
White

Default

Quote:
Originally Posted by luciferMotorCade View Post
16vt?????? MK1? mk2?
Sorry i am refering to a 2.0L 16v Turbo. 2.0 aba from mk2 Golf GTI for the most part.
Stangy is offline   Reply With Quote
Old 12-07-2012, 12:02 PM   #22
luciferMotorCade
Scooby Newbie
 
Member#: 253611
Join Date: Jul 2010
Chapter/Region: NWIC
Location: the couve
Vehicle:
2004 GeNOME
WRB

Default

lol nice. While my wrx is down I am driving my mk1 gti. I had a 2.0l 16v but never got to swapping it in. My cars previous were

1978 scirocco 1.6
gf's 1978 cabby
gf's 1992 jetta
and my le3c 1984 gti
Gfs 2001 beetle.

If i ever get my butt in gear to get my wrx going a 20v is going in the gti. Are you on vortex at all. The op hates my obsesion with VW's


Edit. I knew what you meant on 16vt.. I just got excited .

Last edited by luciferMotorCade; 12-07-2012 at 12:03 PM. Reason: cause i can
luciferMotorCade is offline   Reply With Quote
Old 12-07-2012, 12:34 PM   #23
Stangy
Scooby Newbie
 
Member#: 329676
Join Date: Aug 2012
Chapter/Region: E. Canada
Location: Canada
Vehicle:
1999 GC8 R-STI
White

Default

On vwtex of course! The Subaru thing is brand new! Man old vw engines are SO MUCH EASIER to work with/on.
Stangy is offline   Reply With Quote
Old 12-07-2012, 12:55 PM   #24
luciferMotorCade
Scooby Newbie
 
Member#: 253611
Join Date: Jul 2010
Chapter/Region: NWIC
Location: the couve
Vehicle:
2004 GeNOME
WRB

Default vw>subaru

this is true. fxt05 and I have had more problems with our subies than my 28yr old vw. only issue was the cold start injector fuel line had a small hole in it. never left me stranded like our subies.
you have any build threads on your cars?
luciferMotorCade is offline   Reply With Quote
Old 12-07-2012, 12:57 PM   #25
fxt05
Scooby Newbie
 
Member#: 208521
Join Date: Apr 2009
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
'96 STI Type RA
'05 FXT

Default

Hey. Take all this vw talk back to vwvortex!
fxt05 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 04:13 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2015, North American Subaru Impreza Owners Club, Inc.