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Old 09-15-2013, 02:48 AM   #1
subimp6u08
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Default CEL after pumping gas

I have 05 sti and installed walbro fuel pump last year.
This started happening a few months ago, whenever I stop to pump gas at the gas station. I tried to hold the pump with my hand, but it stops automatically after 1-2 gallons or even less. It feels like that there's too much air inside of the gas tank or something.
The problem is I get CEL after I fill the tank and cruise control on the free way. Then CEL comes up, and it's p0457 (Evaporative Emission Control System Leak Detected (fuel cap)) from my AP.
I just reset it everytime when it happens, and it happened tonight as well.
What could be the problem and could changing the fuel pump cause this, and what can I do to solve this issue?
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Old 09-15-2013, 03:25 AM   #2
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Bad fuel cap? Had a Mazda some what same problems. And it was because of the fuel cap.
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Old 09-15-2013, 04:11 AM   #3
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Originally Posted by Subie_Mike View Post
Bad fuel cap? Had a Mazda some what same problems. And it was because of the fuel cap.
what about the fuel pump keeps stopping while pumping the gas?
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Old 09-15-2013, 10:07 AM   #4
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My 04 STI did the same thing. Took it to the dealer finally to have it looked at, and they ended up replacing a gasket on the top of the fuel tank. I'll try to dig up the paperwork for the repair and see exactly what they called it and post in reply when I find it, but you might start there.
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Old 09-15-2013, 10:30 AM   #5
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This happened to my friends Mini Cooper, all we had to do was tighten the gas cap more and clear the code and it was fine. But that my own Experience with it and yours could be different.
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Old 09-15-2013, 01:33 PM   #6
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Originally Posted by trucker944 View Post
My 04 STI did the same thing. Took it to the dealer finally to have it looked at, and they ended up replacing a gasket on the top of the fuel tank. I'll try to dig up the paperwork for the repair and see exactly what they called it and post in reply when I find it, but you might start there.
so your sti kept stopping while pumping gas too?
I understand about the CEL code possibly due to the gas cap, but not sure why it would keep stop pumping the gas
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Old 09-15-2013, 05:19 PM   #7
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The reason you are putting in gas at all is because there is too much air in the tank.


Maybe something is keeping the gas from leaving the fill tube.
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Old 09-15-2013, 05:22 PM   #8
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Originally Posted by chapstien View Post
The reason you are putting in gas at all is because there is too much air in the tank.

Maybe something is keeping the gas from leaving the fill tube.
That's what I thought, so what could've caused that? Or how do I remove air?
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Old 09-15-2013, 05:41 PM   #9
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Jamming it in to far. I've had this happen before where I needed to back it out about an inch.
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Old 09-15-2013, 06:03 PM   #10
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Clean up the fuel filler neck with some emery cloth, buy a new gas cap, and don't jam the fuel nozzle in so far... Should clear that problem up. Gas cap has to seal, so no fuel vapors come out of your fuel tank. That's what EVAP is. Evaporative emissions.. Basically your car burns the fuel vapors, so it's not released into the atmosphere.
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Old 09-16-2013, 08:24 AM   #11
Swan1234
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Try replacing the gasket around the access panel you had to open to remove the fuel pump.
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Old 09-16-2013, 12:51 PM   #12
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Could also be a sign of a bent filler hose which you can check. Might have a bend or kink in it which will restrict the flow of some gas stations that use the high flow pumps. Does it happen only some times? If so, it's probably the filler hose. For the code get the gas cap as suggested.
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Old 09-16-2013, 01:56 PM   #13
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Quote:
Originally Posted by Freep View Post
Could also be a sign of a bent filler hose which you can check. Might have a bend or kink in it which will restrict the flow of some gas stations that use the high flow pumps. Does it happen only some times? If so, it's probably the filler hose. For the code get the gas cap as suggested.
it happens everytime I pump the gas now. It was less frequent before and it didn't happen for a couple months until recently.
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Old 09-16-2013, 02:31 PM   #14
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So much stupid here.

You have two issues: MIL and inability to fill your tank.

Since your evap code did not set prior to replacing your fuel pump, check the seal of the gasket. A leak here will set the DTC. Could it be a gas cap? Yes, but why did it fail suddenly after the fuel pump replacement? There could be other issues as well, but start there.

Your fuel tank has a valve at the top that allows the air displaced when filling your tank to flow through your evaporative cannister, through a large solenoid (vent valve) and then out to atmosphere. That valve has a float in it, so that when the tank gets near full, the float seats, which causes pressure to build in the tank. That pressure shuts off the pump nozzle. The valve could be sticking. You could have a restriction somewhere in the hose (and this can be caused by, believe it or not, a spider web). Your cannister may be contaminated. The vent valve is normally open, so for the most part, a failure in that causes it not to seal tightly, which it only does during an evaporative system self-check, and won't cause the pump to shut off prematurely.
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Old 09-16-2013, 03:42 PM   #15
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Quote:
Originally Posted by WRX boarder View Post
Jamming it in to far. I've had this happen before where I needed to back it out about an inch.
...............
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Old 09-16-2013, 04:06 PM   #16
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I've tried not to stick it in too far, but it still happened.
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Old 09-16-2013, 04:22 PM   #17
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Quote:
Originally Posted by SpamBot View Post
So much stupid here.

You have two issues: MIL and inability to fill your tank.

Since your evap code did not set prior to replacing your fuel pump, check the seal of the gasket. A leak here will set the DTC. Could it be a gas cap? Yes, but why did it fail suddenly after the fuel pump replacement? There could be other issues as well, but start there.

Your fuel tank has a valve at the top that allows the air displaced when filling your tank to flow through your evaporative cannister, through a large solenoid (vent valve) and then out to atmosphere. That valve has a float in it, so that when the tank gets near full, the float seats, which causes pressure to build in the tank. That pressure shuts off the pump nozzle. The valve could be sticking. You could have a restriction somewhere in the hose (and this can be caused by, believe it or not, a spider web). Your cannister may be contaminated. The vent valve is normally open, so for the most part, a failure in that causes it not to seal tightly, which it only does during an evaporative system self-check, and won't cause the pump to shut off prematurely.
My money is on this, as my tanks does this after deleting the charcoal canister.

Either your float is stuck or you have a clog in the breather vent line to atmosphere, both are a dropping the tank to get a good look and fix it.
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Old 10-25-2013, 09:26 PM   #18
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thanks for the inputs. I contacted a shop and the guy told me that I probably have to replace the charcoal canister. Before I do this, I want to check the float. Is this something that I can do on my own or do I have to take it to the shop?
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Old 10-27-2013, 06:47 PM   #19
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Had this happen once in the winter when i pumped gas with car running, needless to say i dont do that anymore
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Old 10-27-2013, 08:06 PM   #20
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Happened on my old car, instead of ramming the gas nozzle all the way in, pull it out a little and it wont click stop until its really done, the CEL could just ne a bad gas cap.
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Old 10-28-2013, 07:59 AM   #21
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Any vehicle that gas stops pumping into constantly, has a stuck rollover valve. It's what prevents fuel from spilling back out of the tank in the event of a rollover. This is common on all makes and models of every manufacturer, especially if cars sit for long periods of time.

Remove the filler hose, pour some seafoam or similar product on the valve and let it work it's penetrating magic.. exercise the flap a few dozen times and you should be good to go. (pump gas.)
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Old 10-28-2013, 08:08 AM   #22
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If your float was stuck in any position it would not matter. It's just a little foam block on an aluminum rod. Nothing about the float or the way it works is going to have any effect on you pouring gas into the vehicle. The whole concept of the float is to provide a reading for the dash gauge. If it's reading full, or reading empty, it still only takes up the same amount of volume in the tank and can't stop you from filling the tank no matter what the dash reads.

Charcoal emissions canisters have nothing to do with fuel not going into the tank either. I understand the "theory" about air not being able to escape because of a clogged canister, and thus the pump turning off, but that is next to impossible. Air ( &fuel vapor) constantly flows around the nozzle as you fill a vehicle, no significant amount of pressure is going to build up in a gas tank with the cap off, and nozzle filling. No where near enough to shut the pump off. Not in the short period of time it takes to fill up with 15 gallons of fuel.

A lot of people cross the lines when they reinstall a fuel pump sending unit, they often mix up the drain line, and the vent line, causing the canister to fiill with fuel, which on newer cars can cause a CEL.

Gas cap not making a seal will cause modern vehicles CEL to come on, replace the cap.
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Old 10-28-2013, 09:08 AM   #23
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Quote:
Originally Posted by Box This View Post
If your float was stuck in any position it would not matter. It's just a little foam block on an aluminum rod. Nothing about the float or the way it works is going to have any effect on you pouring gas into the vehicle. The whole concept of the float is to provide a reading for the dash gauge. If it's reading full, or reading empty, it still only takes up the same amount of volume in the tank and can't stop you from filling the tank no matter what the dash reads.

Charcoal emissions canisters have nothing to do with fuel not going into the tank either. I understand the "theory" about air not being able to escape because of a clogged canister, and thus the pump turning off, but that is next to impossible. Air ( &fuel vapor) constantly flows around the nozzle as you fill a vehicle, no significant amount of pressure is going to build up in a gas tank with the cap off, and nozzle filling. No where near enough to shut the pump off. Not in the short period of time it takes to fill up with 15 gallons of fuel.

A lot of people cross the lines when they reinstall a fuel pump sending unit, they often mix up the drain line, and the vent line, causing the canister to fiill with fuel, which on newer cars can cause a CEL.

Gas cap not making a seal will cause modern vehicles CEL to come on, replace the cap.
The "float" referred to is the fuel tank vent valve, not the fuel level sender float.
A clogged cannister will definitely affect your ability to fill your tank. A stuck rollover valve will not. Please stop giving out bad info.
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Old 10-29-2013, 12:15 AM   #24
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Quote:
Originally Posted by BakerSnowboards View Post
Happened on my old car, instead of ramming the gas nozzle all the way in, pull it out a little and it wont click stop until its really done, the CEL could just ne a bad gas cap.
I tried that everytime when I pumped gas, but it didn't work.
I guess I can try to replace the gas cap first, and see if that will solve the problem but I highly doubt it.
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Old 10-29-2013, 12:31 AM   #25
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Quote:
Originally Posted by SpamBot View Post
The "float" referred to is the fuel tank vent valve, not the fuel level sender float.
A clogged cannister will definitely affect your ability to fill your tank. A stuck rollover valve will not. Please stop giving out bad info.
This.
My 06 Sentra had a bad purge solenoid. Similar thing was happening. Couldn't get more than 6 litres in from an empty tank before the pump shut off. Even less as I filled it more. Difference was, I was getting a p0446 (I think) code.
I'd definitely check around the carbon canister. Check the purge solenoid, make sure all the lines are still connected and aren't cracked or split.
I'd guess that it's a coincidence that you changed your fuel pump. If the issue didn't show up right away, I'd be less inclined to think it's related.
Best of luck!
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