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Old 07-22-2014, 12:04 AM   #1
my2001e46
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Join Date: Jun 2014
Location: Memphis TN
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My Ride: 2001 325i
P0455 code after fuel pump replacement

Hi all,

My fuel pump just failed last weekend. After I replaced the new pump, my e46 runs well. Except this evening, it threw the P0455 code on me. I understand it means it detect a leak in the fuel system. I have check the tank cap and was sure it should not be the problem.

The only thing I am not very sure is... when I put the fuel pump back, I wasn't very careful about the orientation of the rubber seal. I believe I left the bigger edge facing up. If you take a look at the picture that I borrow from the part store, it sits with the bigger, or wider edge facing down. I can't find out which way I should go based on the internet search. Can anyone help me verify it?

By now, I just erase the code and see if it will come back. I am not sure if that is a transient problem.

Any input will be greatly appreciated.
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Old 07-22-2014, 06:43 AM   #2
jfoj
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Very common problem is how the sending unit gasket is installed.

The gasket must be put on the tank first. There is a groove in the side of the gasket that must be put on the lip of the tank.

The gasket almost always comes out stuck to the sending unit and many people think this is the way it is reinstalled.

Again, gasket must be put on the lip of the tank, then the pump is dropped into the gasket mounted on the tank lip.

See 2nd link in my signature.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 07-22-2014, 09:30 AM   #3
my2001e46
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Location: Memphis TN
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Quote:
Originally Posted by jfoj View Post
I believe there is the word "TOP or UP" embossed in the fuel sender gasket.
Thanks a lot for leading me to the detailed thread. Nice written. I will see if the code comes back again and check the seal carefully. Do you think I should buy a new seal? The old one seems to be in sound condition... well compare to the valve cover gasket I just replace, which has less time on the car.

Cheers!
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Old 07-22-2014, 10:01 AM   #4
jfoj
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Quote:
Originally Posted by my2001e46 View Post
Thanks a lot for leading me to the detailed thread. Nice written. I will see if the code comes back again and check the seal carefully. Do you think I should buy a new seal? The old one seems to be in sound condition... well compare to the valve cover gasket I just replace, which has less time on the car.

Cheers!
I reuse the original fuel pump seals all the time without problems.

If the seal is not installed correctly, you will have a fuel leak on a tank that is fully filled up to about 7/8ths of a tank. Might be a big leak, might just be a fuel smell and a very small leak.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 07-22-2014, 12:13 PM   #5
my2001e46
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Thanks a lot for your information! I don't think I have a severe leak. I didn't smell anything and checked again after my first drive with the new pump. But I haven't filled the tank yet it is running to about 1/5 left. Will fill it about half full today and keep my eyes on the SES light.
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Old 07-22-2014, 06:42 PM   #6
my2001e46
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Some update:
Just filled my car with half tank of gas and drove back home. Sure enough I can smell the gas. So taking away all covering stuff, I see the pump is leaking gas...not too bad. Apparently I need to re-install the pump correctly.

So I started to disconnect the fuel line...forgetting to depressurize the line... gas spits everywhere

After cleaning the mass, I unscrewed the metal ring and the pump jumped out right away. The rubber seal was not seated well in the hole. I determined it is because I didn't tight the ring well enough. when I did it last time, I just hand-tightened it, and then used the hammer and flat head screw drive to push the ring twice. There must be some space allowing the pump to move.

One more thing I can confirm is that there is "This side face down" embossed on one side of the seal surface. (jfoj, I took picture of it. I will upload it a bit later. Just in case if you want to add it into your fuel pump thread for other's reference.) So I was correct on the orientation.

So, I just re-install the pump. And run the car for a bit and make sure nothing comes out. After I confirm no leak or smell, I will put the seat back.

BTW, a pending code P0455, EVAP leak major, is already stored in my ECU. I clear it again and will check it again later.

Overall, I have to say the the computer did a good job give me warning on the leak. And thanks to jfoj for your kind help.
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Old 07-22-2014, 07:14 PM   #7
jfoj
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Quote:
Originally Posted by my2001e46 View Post
Some update:
Just filled my car with half tank of gas and drove back home. Sure enough I can smell the gas. So taking away all covering stuff, I see the pump is leaking gas...not too bad. Apparently I need to re-install the pump correctly.

So I started to disconnect the fuel line...forgetting to depressurize the line... gas spits everywhere

After cleaning the mass, I unscrewed the metal ring and the pump jumped out right away. The rubber seal was not seated well in the hole. I determined it is because I didn't tight the ring well enough. when I did it last time, I just hand-tightened it, and then used the hammer and flat head screw drive to push the ring twice. There must be some space allowing the pump to move.

One more thing I can confirm is that there is "This side face down" embossed on one side of the seal surface. (jfoj, I took picture of it. I will upload it a bit later. Just in case if you want to add it into your fuel pump thread for other's reference.) So I was correct on the orientation.

So, I just re-install the pump. And run the car for a bit and make sure nothing comes out. After I confirm no leak or smell, I will put the seat back.

BTW, a pending code P0455, EVAP leak major, is already stored in my ECU. I clear it again and will check it again later.

Overall, I have to say the the computer did a good job give me warning on the leak. And thanks to jfoj for your kind help.
The key to all of this is the groove in the side of the gasket needs to be put in the lip of the fuel tank. This is where most people mess this up.

It is hard to explain but simple obvious if you can actually look at the side of the gasket.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 07-23-2014, 09:09 PM   #8
my2001e46
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My Ride: 2001 325i
Here is the picture of the rubber seal. See the label indicates "This side down".

Sent from BimmerApp mobile app
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