Welcome to the North American Subaru Impreza Owners Club Tuesday July 29, 2014
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 > Service & Maintenance

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 02-09-2010, 10:54 PM   #1
240sxguy
Scooby Newbie
 
Member#: 229791
Join Date: Nov 2009
Chapter/Region: MWSOC
Location: Madison area
Vehicle:
2002 WRX wagon
Black

Default Low fuel pressure 02' wrx, thoughts?

Fuel pressure pops up to 43 when first starting the car then after about 20 sec of idle it starts dropping down to the low 20s.. which directly follows
the a/f dip. I tested f/p before and after the filter.. same result. I
also tried two different pumps, and I know for a fact the car ran fine
on one of them.

This leaves either the f/p controller or... bad fuel pressure
regulator? I am going to do a bit more reading on this whole situation
to familiarize myself with the controller's function. I doubt it is
the FPR, and removing the fuel line doesn't change anything. Have any
thoughts?

Thanks guys!

Evan
* Registered users of the site do not see these ads.
240sxguy is offline   Reply With Quote
Old 02-10-2010, 08:39 AM   #2
rkramer
Scooby Guru
 
Member#: 118209
Join Date: Jun 2006
Chapter/Region: MWSOC
Location: North Dakota
Vehicle:
2002 WRX Sedan

Default

The fuel pump runs at 3 different speeds (voltage levels) based on demand, maybe you are just seeing that?
rkramer is offline   Reply With Quote
Old 02-10-2010, 08:42 AM   #3
240sxguy
Scooby Newbie
 
Member#: 229791
Join Date: Nov 2009
Chapter/Region: MWSOC
Location: Madison area
Vehicle:
2002 WRX wagon
Black

Default

That was my initial thought as well, but 22psi of fuel is definitely not enough to atomize it well enough. Looking around here on the forum it appears that 42-43 with the vac off is more in the normal range (and really pretty much an industry standard).

I think the controller might be bad, I got this car with a blown motor so I am not entirely sure what has been done to it!

Thanks.

Evan
240sxguy is offline   Reply With Quote
Old 02-10-2010, 09:18 AM   #4
xsnapshot
Scooby Newbie
 
Member#: 170973
Join Date: Feb 2008
Location: Lincoln, NE
Vehicle:
2004 WRX 4EAT
PSM

Default

Subcribed. I think I'm having the same issue.
xsnapshot is offline   Reply With Quote
Old 02-10-2010, 09:31 AM   #5
240sxguy
Scooby Newbie
 
Member#: 229791
Join Date: Nov 2009
Chapter/Region: MWSOC
Location: Madison area
Vehicle:
2002 WRX wagon
Black

Default

xsnapshot, have you put a fuel pressure gauge on your car?
240sxguy is offline   Reply With Quote
Old 03-07-2010, 05:53 PM   #6
240sxguy
Scooby Newbie
 
Member#: 229791
Join Date: Nov 2009
Chapter/Region: MWSOC
Location: Madison area
Vehicle:
2002 WRX wagon
Black

Default

The answer (as far as I know) was bad fuel controller. I bypassed it completely with a relay.

Evan
240sxguy is offline   Reply With Quote
Old 03-08-2010, 01:11 AM   #7
Uncle Scotty
Scooby Guru
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK Houston
we have an Uncle

Default

Quote:
Originally Posted by 240sxguy View Post
The answer (as far as I know) was bad fuel controller. I bypassed it completely with a relay.

Evan

this may cause the frequent failure of the fuel pump as it isnt rated for 100% duty cycle and will burn it up
Uncle Scotty is offline   Reply With Quote
Old 03-08-2010, 07:24 AM   #8
240sxguy
Scooby Newbie
 
Member#: 229791
Join Date: Nov 2009
Chapter/Region: MWSOC
Location: Madison area
Vehicle:
2002 WRX wagon
Black

Default

Quote:
Originally Posted by Uncle Scotty View Post
this may cause the frequent failure of the fuel pump as it isnt rated for 100% duty cycle and will burn it up
Uncle Scotty, I have a walbro pump in my car. I run the one in my 240sx wide open every day.

I do plan on trying to find a new fuel controller though, thanks for the heads up.

Evan
240sxguy is offline   Reply With Quote
Old 03-08-2010, 07:26 AM   #9
bboylocob
Scooby Specialist
 
Member#: 151809
Join Date: Jun 2007
Chapter/Region: South East
Location: New Orleans
Vehicle:
2007 WRX
Black

Default

go to dealer. my frind just had the same probl. he went to the dealer and come to find out it is a manf. probl. with the fuel lines. they had to replace the entire fuel lines under warrenty even though his is an 02
bboylocob is offline   Reply With Quote
Old 03-08-2010, 07:29 AM   #10
240sxguy
Scooby Newbie
 
Member#: 229791
Join Date: Nov 2009
Chapter/Region: MWSOC
Location: Madison area
Vehicle:
2002 WRX wagon
Black

Default

Yo mods, can we lock this thread? It has been resolved and the reason for the problem has been posted.

Evan
240sxguy 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lean condition via low fuel pressure? BadTrip UTEC 18 11-06-2006 12:23 PM
low fuel pressure notgm Factory 2.0L Turbo Powertrain 5 01-20-2006 08:37 PM
Suddenly, Low Fuel Pressure at idle?? IowaRS Normally Aspirated with bolt-on Forced Induction Powertrain 7 01-02-2005 06:32 PM
Low Fuel Pressure, help! Diezel Factory 2.0L Turbo Powertrain 0 10-14-2004 03:32 PM
Low fuel Pressure ej20g joehack98 Subaru Conversions 12 01-26-2004 04:26 AM


All times are GMT -4. The time now is 02:50 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.