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10-23-2008, 11:38 AM | #1 |
Scooby Specialist
Member#: 42548
Join Date: Aug 2003
Location: SLC, UT
Vehicle:2020 STI Series Whit Ceramic White |
possible bad fuel pump?
Car is a ej20g with sti 2.5 shortblock, yellowtop inj, wrx fuel pump, pfc, new age coil upgrade.
So while driving home on a road trip this weekend my car started randomly juttering/jerking while cruising at around 85. Pulled over when it became bad and initially thought ignition. Took off all the coils and double checked the wiring and cleaned up the wires a bit. Car started up and I continued to drive. Made it back home but the whole time occasionally the car would do the jutter.Felt like the car just lost power for a split second. Yesterday while driving the car all the sudden severely started juttering and loosing power in and out and then eventually straight up died. Thought I was out of fuel. Filled her up and still nothing. Car cranks but doesn't turn over. After trying to start it a few more times the car started and idled for 10 min then would die. Took the fuel pump out to make sure it was working. Could hear it spinning and pumped fuel out of the lines. BUT when just trying to turn over the car no luck. BUT if i prime the car (turn the key from off to on) a good 5-10 times the car will start right up run great and then die after 10 min. So I'm guessing it's running off the fuel it was primed with then dying after it burns it? Or the pump can pump enough into the lines but can't hold pressure? Really need some ideas here. When the car does start it runs very well.
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10-23-2008, 12:04 PM | #2 |
Scooby Guru
Member#: 177
Join Date: Aug 1999
Chapter/Region:
NWIC
Location: Austin, Texas, USA
Vehicle:The 93 W/EJ20K-sold Subaru-less :( |
could be the relay too or the ecu tonnection to the relay
cruise is an odd time to have it die |
10-23-2008, 12:12 PM | #3 |
Scooby Specialist
Member#: 42548
Join Date: Aug 2003
Location: SLC, UT
Vehicle:2020 STI Series Whit Ceramic White |
thanks for the response jaxx. how can i check if the relay is bad?
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10-24-2008, 09:36 AM | #4 |
Scooby Specialist
Member#: 101865
Join Date: Nov 2005
Chapter/Region:
NWIC
Location: Covington, WA
Vehicle:88 GL-10 STi silver |
dont check it by sound. put a fuel pressure gauge on it. i have had rendom problems like this and taped a gauge to the windsheld and drove, after driving for a while the pressure would drop and the car would die...
-=Suberdave=- |
10-24-2008, 10:57 AM | #5 |
Scooby Specialist
Member#: 42548
Join Date: Aug 2003
Location: SLC, UT
Vehicle:2020 STI Series Whit Ceramic White |
so if the pressure does indeed drop, should i be replacing the fuel pump or the fuel pressure regulator?
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10-24-2008, 11:11 AM | #6 |
Scooby Guru
Member#: 177
Join Date: Aug 1999
Chapter/Region:
NWIC
Location: Austin, Texas, USA
Vehicle:The 93 W/EJ20K-sold Subaru-less :( |
thought
what is the condition of the vacuum hose on the FPR |
10-24-2008, 02:58 PM | #7 |
Scooby Specialist
Member#: 42548
Join Date: Aug 2003
Location: SLC, UT
Vehicle:2020 STI Series Whit Ceramic White |
just checked the vacuum hose. in great condition.......looks like i might have to just replace both parts and go from there...
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10-25-2008, 06:40 PM | #8 |
Scooby Specialist
Member#: 42548
Join Date: Aug 2003
Location: SLC, UT
Vehicle:2020 STI Series Whit Ceramic White |
replaced the fuel pump and fuel pump wiring. everything seems to be good now. however....i can't deal with the stresses of this car anymore with all the other stuff goin on in life. time to sell it.
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10-25-2008, 06:58 PM | #9 |
Scooby Specialist
Member#: 43916
Join Date: Sep 2003
Chapter/Region:
RMIC
Location: Old Town
Vehicle:2001 Impreza 4.7 Blue Ridge Pearl |
didnt you just post that you loved it?
just buy a beater for like 400 bones |
10-25-2008, 08:55 PM | #10 |
Scooby Specialist
Member#: 42548
Join Date: Aug 2003
Location: SLC, UT
Vehicle:2020 STI Series Whit Ceramic White |
I do love it. Doesn't mean I have the time to love it. 3 years goin on 4 owning a swap and it's taxing even with the fun.
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