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Old 03-14-2017, 09:55 AM   #1
psshhhaa
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Default Fixed Leaking Fuel Lines, Now Running Rich

Hey all, I'm trying to diagnose what's going on with my car. I had my car tuned at iaPerformance and all was good. I had the leaky fuel line issues underneath the intake manifold, had that fixed, now my wideband indicates I'm running rich. Before the fix, I was running 14.7 AFR on daily driving. Now after the fix, I run at 13.2-13.5 AFRs sometimes then it goes back to 14.7 AFR, and keeps switching. Another indicator is poor fuel economy. I used to get 450km per tank, now I get around 350km.

Any idea where to start diagnosing?
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Last edited by psshhhaa; 03-14-2017 at 10:21 AM.
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Old 03-14-2017, 10:52 AM   #2
Brad47933
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My 03 runs at 14.2afr . Tried injector cleaner maybe.?
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Old 03-14-2017, 10:52 AM   #3
hoffmanEstates
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Quote:
Originally Posted by psshhhaa View Post
Hey all, I'm trying to diagnose what's going on with my car. I had my car tuned at iaPerformance and all was good. I had the leaky fuel line issues underneath the intake manifold, had that fixed, now my wideband indicates I'm running rich. Before the fix, I was running 14.7 AFR on daily driving. Now after the fix, I run at 13.2-13.5 AFRs sometimes then it goes back to 14.7 AFR, and keeps switching. Another indicator is poor fuel economy. I used to get 450km per tank, now I get around 350km.

Any idea where to start diagnosing?
Get a retune possibly.
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Old 03-14-2017, 11:06 AM   #4
A-man07
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Call your tuner.
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Old 03-15-2017, 01:26 PM   #5
danger1138
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Maybe the ecu compensated for the leaky fuel lines by "adding" more fuel. Now that you have fixed the leaky lines, the ecu is still running that fuel trim it adjusted for when you had the leaky fuel lines.

Did you try resetting the ecu after the fix?
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Old 03-16-2017, 12:59 PM   #6
fenix-silver
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Just how bad was the leak? If the leak was big enough to affect the fueling, I'd imagine you would have had fuel all over the place.
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Old 03-16-2017, 07:23 PM   #7
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Originally Posted by fenix-silver View Post
Just how bad was the leak? If the leak was big enough to affect the fueling, I'd imagine you would have had fuel all over the place.


Excuse me sir. I believe OP's fuel leak is what most of us North easterners suffer from when it get real cold. The runner portion of the fuel lines tend to shrink and expand over time causing some fuel (small drops) to seep out upon start up.
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Old 03-17-2017, 11:22 AM   #8
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Originally Posted by danger1138 View Post
Excuse me sir. I believe OP's fuel leak is what most of us North easterners suffer from when it get real cold. The runner portion of the fuel lines tend to shrink and expand over time causing some fuel (small drops) to seep out upon start up.
I had the same issue and actually had fuel pooling on the top of the block. I don't believe it ever affected my fueling though.
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Old 03-19-2017, 01:25 AM   #9
psshhhaa
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Quote:
Originally Posted by danger1138 View Post
Maybe the ecu compensated for the leaky fuel lines by "adding" more fuel. Now that you have fixed the leaky lines, the ecu is still running that fuel trim it adjusted for when you had the leaky fuel lines.

Did you try resetting the ecu after the fix?
I was thinking this. I have reset the battery several times, would this reset the ECU?

Quote:
Originally Posted by fenix-silver View Post
Just how bad was the leak? If the leak was big enough to affect the fueling, I'd imagine you would have had fuel all over the place.
I could see the fuel leaking underneath the intake manifold and enough to smell it while driving, but it wasn't gushing out all over the place. I would say it was a slow leak.
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Old 03-19-2017, 01:27 AM   #10
psshhhaa
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Quote:
Originally Posted by danger1138 View Post
Excuse me sir. I believe OP's fuel leak is what most of us North easterners suffer from when it get real cold. The runner portion of the fuel lines tend to shrink and expand over time causing some fuel (small drops) to seep out upon start up.

^This
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Old 03-19-2017, 01:39 PM   #11
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there's no way a small leak would cause enough pressure drop to lean out the AFR. maybe something got moved or disconnected while messing around under the manifold. whats your IAM running at? if it drops too much you go into fail safe fuel table (richer fuel). if you took a bunch of stuff apart it could be all sorts of things.

did you do anything to the ECU like flash to a stock map or something.
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Old 03-19-2017, 01:59 PM   #12
psshhhaa
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Quote:
Originally Posted by CarmelValleyWRX View Post
there's no way a small leak would cause enough pressure drop to lean out the AFR. maybe something got moved or disconnected while messing around under the manifold. whats your IAM running at? if it drops too much you go into fail safe fuel table (richer fuel). if you took a bunch of stuff apart it could be all sorts of things.

did you do anything to the ECU like flash to a stock map or something.
I'll report back on my IAMS. They had to take off the intake manifold to replace the rubber hoses that connect to the fuel rails.

Nothing to the ECU besides disconnecting/reconnecting the battery.
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Old 03-19-2017, 02:03 PM   #13
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maybe you had an air leak when it got tuned and the fuel or injector or MAF mapping is all screwy. then they took the manifold off and the leak got fixed when everything was reassembled.
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Old 03-19-2017, 02:32 PM   #14
psshhhaa
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Quote:
Originally Posted by CarmelValleyWRX View Post
maybe you had an air leak when it got tuned and the fuel or injector or MAF mapping is all screwy. then they took the manifold off and the leak got fixed when everything was reassembled.
I had the car boost leak tested and vacuum leak tested and no evidence of any leaks were found prior to the tune.

I'm thinking that after the work was done to fix the fuel leaks, that's when I started running rich so it's 2 possibilities:

1. Previous tune was done with the fuel leak in place. Fuel leak fixed and now my current tune is compensating extra fuel for what was previously tuned on the fuel leak
2. When the work was being done, something wasn't reconnected and I have a vacuum leak or boost leak somewhere
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Old 03-19-2017, 04:50 PM   #15
CarmelValleyWRX
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1. is virtually impossible unless the fuel line was leaking gallons per minute. the pump just turns on and the regulator keeps the rails at a certain pressure. injectors turn on for certain amount of time. none of those components will be affected by a few drops getting out of the system from a leak.

2. is very likely.
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Old 03-19-2017, 06:09 PM   #16
Blktrax
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Vacuum leak would cause it to be lean, boost leak would cause it to be rich.
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Old 03-19-2017, 10:59 PM   #17
psshhhaa
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I will do a boost leak test and report back, thanks.
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