Car Over-fueling After Fuel Line Came Loose - Need Ideas!

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01-16-2019, 06:56 PM

TypeC

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Car Over-fueling After Fuel Line Came Loose - Need Ideas!

Setup: 9th gen Si, turbo kit, ID injectors, e85, flashPro/stock ECU (car has run flawlessly)

When installing my Dakota Digital box, I removed the fuel line from my flex fuel sensor but apparently didn't put it on fully (didn't snap-in). Drove the car for several miles just fine (even a quick WOT pull which had perfect fueling). A mile from home the car started sputtering horribly, and I limped it home (~1/2 mile). My fuel connection is located above my air filter and beside my ECU.
I found that the fuel line had come off, so I reconnected it. Car wouldn't start.
I removed spark plugs, let everything dry overnight, and the car started.
Car runs SUPER rich - I had to remove 30% fuel just to get it to have normal fuel trims (otherwise it is sub 10:1 even at idle)

Things I've tried (with no result):

Unplugged battery
Re-flashed ECU (with same map)
New MAF (thinking old one got e85 on it as filter got very wet)
Swapped injectors (ID1700 first, then ID1300 next both with proven/solid maps that I ran recently)
Compression test (180-185 across the board)
Adjust fuel scaling in ECU (I have to remove 30%, which is nuts and even then the car tries to over-fuel once it has been driven a little)
Unplug flex fuel connector (this has the same effect of removing 30% fuel, as that's what in the table for my ethanol content)

At this point, I'm almost out of ideas.

Only things I can think of:

ECU was shorted somehow, perhaps via the flex fuel connector (ELD2 on ECU), or any connector as fuel was gushing
Swap & reprogram new ECU
Somehow there is fuel pooled in my FMIC (long shot?)

---Solved---

To follow my hunch, removed FMIC and found a TON of gas trapped inside. This explains the overfueling and how it wasn't consistent (more airflow caused even higher fueling). Thankfully there are several humps/loops in the IC piping, otherwise hydrolock would have been a certainty!

Last edited by TypeC; 01-21-2019 at 06:44 PM.