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Old 12-01-2019, 02:38 AM   #1
02bugeyeproblem
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Default 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 hereís my issue. A month ago my fuel pump gave up. I replaced it and when driving my car home it wouldnít rev past 4600 rpm and wouldnít 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 thatís it then it idles fine. But if I turn it off it wonít turn back on but after it sits a while itíll start up again. Iím 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. Iíve 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 itís my daily and the wife is already tired of me driving her car for work
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Old 12-01-2019, 08:01 AM   #2
MortonCharbo
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PSM

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Fuel filter under the hood or the sock on the fire pump may be clogged up.
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Old 12-01-2019, 10:52 AM   #3
Bluestreak03
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Location: Southern Oregon
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2001 EJ207 RSTi
Mica Blue

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Quote:
Originally Posted by MortonCharbo View Post
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
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Old 12-01-2019, 11:18 AM   #4
MortonCharbo
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Quote:
Originally Posted by Bluestreak03 View Post
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.
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Old 12-01-2019, 08:12 PM   #5
Bluestreak03
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Check to make sure you are getting the proper fuel pressure and double check all your vacuums
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Old 12-02-2019, 11:58 AM   #6
02bugeyeproblem
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New fuel filter has been installed and still same issue. Fuel pressure gauge reads around 45 psi then after wonít read again. When the fuel pump was replaced it had the new screen with it installed
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Old 12-03-2019, 10:16 PM   #7
Bluestreak03
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So pressure is not constant?
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Old 12-05-2019, 12:37 AM   #8
02bugeyeproblem
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No the pressure drops off. But Iím honestly thinking that is my gauge. Itís been finicky since I got the car. I did notice a box under my dash and I canít remember what all it said on it but I do remember it said fuel something. Has anyone else seen this box before? I canít look at it till I get back over to my buddies garage on my day off. I am gonna replace the pump relay and Iíve done all the steps on resetting the ecu besides the driving cause of the part where it wonít go over the 46-4700 rpm. Iím tempted to fully unplug the ecu and check itís connections and check all my connections on the car and clean off all the grounds to be safe. Iím at a loss. Simple fuel pump goes into a giant headache
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Old 12-05-2019, 10:34 AM   #9
08redWRX
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Last edited by 08redWRX; 12-05-2019 at 01:17 PM.
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Old 12-05-2019, 12:16 PM   #10
Jack
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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.
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Old 12-08-2019, 10:32 PM   #11
02bugeyeproblem
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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 wonít go over 4700 rpm.
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Old 12-09-2019, 02:31 PM   #12
Bluestreak03
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2001 EJ207 RSTi
Mica Blue

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I know this might be obvious, but is the CEL on?
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Old 12-09-2019, 11:58 PM   #13
02bugeyeproblem
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Cel isnít on. Tried to pull codes and nothing came up. Iím going to try disconnecting the battery over my shutdown and seeing if something happens.
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