Fuel system issues

02bugeyeproblem · 12-01-2019, 02:38 AM

So I have read through several threads on here and have over a dozen answers to things that could be and might not be a issue. So here’s my issue. A month ago my fuel pump gave up. I replaced it and when driving my car home it wouldn’t rev past 4600 rpm and wouldn’t boost past 8 psi. Now I changed over to a higher pressure pump cause I thought that was the issue. Now the car will start and run rough then straighten up and idle fine but when I rev up it hits 4700 and that’s it then it idles fine. But if I turn it off it won’t turn back on but after it sits a while it’ll start up again. I’m at a loss and I want to make sure before I tear into it and start dropping money that I see if anyone else had this issue.
Thank you. I’ve worked on cars just not boosted cars
2002 wrx ej20 stock turbo. Full cat less exhaust. Stock header, aftermarket up pipe and full 3 inch exhaust turbo back. No cel, no warning lights, no accessport was ever married to it. Please help it’s my daily and the wife is already tired of me driving her car for work

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MortonCharbo · 12-01-2019, 08:01 AM

Fuel filter under the hood or the sock on the fire pump may be clogged up.

Bluestreak03 · 12-01-2019, 10:52 AM

Quote:

Originally Posted by MortonCharbo

Fuel filter under the hood or the sock on the fire pump may be clogged up.

Replace fuel filter yes, but he already stated he replaced fuel pump... Check fuel pressure. Also you you have a way to check diagnostics? May have knocked to many times and knocked your IAM down very low, not sure if you reset the ECU

MortonCharbo · 12-01-2019, 11:18 AM

Quote:

Originally Posted by Bluestreak03

Replace fuel filter yes, but he already stated he replaced fuel pump... Check fuel pressure. Also you you have a way to check diagnostics? May have knocked to many times and knocked your IAM down very low, not sure if you reset the ECU

He coulda reused the old sock. There's also a ball check valve that could be faulty too, but highly unlikely with a new pump. Just starting with the cheap and easy things first.

Bluestreak03 · 12-01-2019, 08:12 PM

Check to make sure you are getting the proper fuel pressure and double check all your vacuums

02bugeyeproblem · 12-02-2019, 11:58 AM

New fuel filter has been installed and still same issue. Fuel pressure gauge reads around 45 psi then after won’t read again. When the fuel pump was replaced it had the new screen with it installed

Bluestreak03 · 12-03-2019, 10:16 PM

So pressure is not constant?

02bugeyeproblem · 12-05-2019, 12:37 AM

No the pressure drops off. But I’m honestly thinking that is my gauge. It’s been finicky since I got the car. I did notice a box under my dash and I can’t remember what all it said on it but I do remember it said fuel something. Has anyone else seen this box before? I can’t look at it till I get back over to my buddies garage on my day off. I am gonna replace the pump relay and I’ve done all the steps on resetting the ecu besides the driving cause of the part where it won’t go over the 46-4700 rpm. I’m tempted to fully unplug the ecu and check it’s connections and check all my connections on the car and clean off all the grounds to be safe. I’m at a loss. Simple fuel pump goes into a giant headache

08redWRX · 12-05-2019, 10:34 AM

Delete

Jack · 12-05-2019, 12:16 PM

02 won't care about the catless dp and up. Play on. But indeed, get a "real" fuel pressure gauge, hook it up and read it when it's running right and when it's not.

02bugeyeproblem · 12-08-2019, 10:32 PM

So the box said electronic fuel pressure. It had a wire broke off and now I have constant fuel pressure to my gauge and the car starts up fine and runs fine but still won’t go over 4700 rpm.

Bluestreak03 · 12-09-2019, 02:31 PM

I know this might be obvious, but is the CEL on?

02bugeyeproblem · 12-09-2019, 11:58 PM

Cel isn’t on. Tried to pull codes and nothing came up. I’m going to try disconnecting the battery over my shutdown and seeing if something happens.

12-01-2019, 02:38 AM	#1
02bugeyeproblem Scooby Newbie Member#: 508912 Join Date: Dec 2019	Fuel system issues So I have read through several threads on here and have over a dozen answers to things that could be and might not be a issue. So here’s my issue. A month ago my fuel pump gave up. I replaced it and when driving my car home it wouldn’t rev past 4600 rpm and wouldn’t boost past 8 psi. Now I changed over to a higher pressure pump cause I thought that was the issue. Now the car will start and run rough then straighten up and idle fine but when I rev up it hits 4700 and that’s it then it idles fine. But if I turn it off it won’t turn back on but after it sits a while it’ll start up again. I’m at a loss and I want to make sure before I tear into it and start dropping money that I see if anyone else had this issue. Thank you. I’ve worked on cars just not boosted cars 2002 wrx ej20 stock turbo. Full cat less exhaust. Stock header, aftermarket up pipe and full 3 inch exhaust turbo back. No cel, no warning lights, no accessport was ever married to it. Please help it’s my daily and the wife is already tired of me driving her car for work * Registered users of the site do not see these ads.

12-05-2019, 10:34 AM	#9
08redWRX Scooby Newbie Member#: 186068 Join Date: Aug 2008 Chapter/Region: South East Location: NC Vehicle: 2019 STi DGM	Delete Last edited by 08redWRX; 12-05-2019 at 01:17 PM.

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12-01-2019, 08:01 AM	#2
MortonCharbo Scooby Newbie Member#: 487057 Join Date: Jun 2018 Chapter/Region: BAIC Location: California Vehicle: 2002 WRX Wagon PSM	Fuel filter under the hood or the sock on the fire pump may be clogged up.

12-01-2019, 08:12 PM	#5
Bluestreak03 Scooby Specialist Member#: 125887 Join Date: Sep 2006 Chapter/Region: NWIC Location: Southern Oregon Vehicle: 2001 EJ207 RSTi Mica Blue	Check to make sure you are getting the proper fuel pressure and double check all your vacuums

12-02-2019, 11:58 AM	#6
02bugeyeproblem Scooby Newbie Member#: 508912 Join Date: Dec 2019	New fuel filter has been installed and still same issue. Fuel pressure gauge reads around 45 psi then after won’t read again. When the fuel pump was replaced it had the new screen with it installed

12-03-2019, 10:16 PM	#7
Bluestreak03 Scooby Specialist Member#: 125887 Join Date: Sep 2006 Chapter/Region: NWIC Location: Southern Oregon Vehicle: 2001 EJ207 RSTi Mica Blue	So pressure is not constant?

12-05-2019, 12:37 AM	#8
02bugeyeproblem Scooby Newbie Member#: 508912 Join Date: Dec 2019	No the pressure drops off. But I’m honestly thinking that is my gauge. It’s been finicky since I got the car. I did notice a box under my dash and I can’t remember what all it said on it but I do remember it said fuel something. Has anyone else seen this box before? I can’t look at it till I get back over to my buddies garage on my day off. I am gonna replace the pump relay and I’ve done all the steps on resetting the ecu besides the driving cause of the part where it won’t go over the 46-4700 rpm. I’m tempted to fully unplug the ecu and check it’s connections and check all my connections on the car and clean off all the grounds to be safe. I’m at a loss. Simple fuel pump goes into a giant headache

12-05-2019, 12:16 PM	#10
Jack Add Lightness Moderator Member#: 13699 Join Date: Dec 2001 Chapter/Region: NESIC Location: Hopkinton, MA Vehicle: not my president (From General)	02 won't care about the catless dp and up. Play on. But indeed, get a "real" fuel pressure gauge, hook it up and read it when it's running right and when it's not.

12-08-2019, 10:32 PM	#11
02bugeyeproblem Scooby Newbie Member#: 508912 Join Date: Dec 2019	So the box said electronic fuel pressure. It had a wire broke off and now I have constant fuel pressure to my gauge and the car starts up fine and runs fine but still won’t go over 4700 rpm.

12-09-2019, 02:31 PM	#12
Bluestreak03 Scooby Specialist Member#: 125887 Join Date: Sep 2006 Chapter/Region: NWIC Location: Southern Oregon Vehicle: 2001 EJ207 RSTi Mica Blue	I know this might be obvious, but is the CEL on?

12-09-2019, 11:58 PM	#13
02bugeyeproblem Scooby Newbie Member#: 508912 Join Date: Dec 2019	Cel isn’t on. Tried to pull codes and nothing came up. I’m going to try disconnecting the battery over my shutdown and seeing if something happens.