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Old 06-20-2011, 04:11 PM   #526
YetiGS
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Quote:
Originally Posted by NCD View Post
Joel, you kick supreme ass. Someone add the above post to the 800 Index & Links!!!

I think I will print your post, laminate it, and keep it in my toolkit!

Again, thank you so much.
I just did the same.


Thanks Joel.
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Old 06-20-2011, 05:32 PM   #527
Apostolos
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Originally Posted by YetiGS View Post


Thanks Joel.
Amen!

I appreciate this forum, but it's members like Joel that make me check it every day.

I think I learn something new every time he posts.

If Joel lived/worked in CA, I'd take my bike to his shop for repairs no matter how far it was.

God Bless,
David
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Old 06-21-2011, 08:12 AM   #528
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Great post Joel, thanks.
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Old 06-22-2011, 07:26 PM   #529
YetiGS
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Heard from dealer a little while ago: fuel pump is shot. New one on the way.


Actually, what he said was that when they tried it this morning, it fired up. They read the codes and there were five "fuel pump fuse codes." After they ran it for a few minutes it threw another fuel pump fuse code.


They called BMW tech who said, "Replace the pump." I guess it's failing . . .


I'm not sure what all this means except that I'm getting a new fuel pump and will religiously use the Techron stuff.
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"You had better bring an extra magazine. Yeti's amped up on weird shit are hard to bring down." Lonestar2112
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Old 06-22-2011, 08:44 PM   #530
Apostolos
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Originally Posted by YetiGS View Post
I'm not sure what all this means except that I'm getting a new fuel pump and will religiously use the Techron stuff.
Were you using the Techron before at all?

God bless,
David
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Old 06-22-2011, 09:42 PM   #531
YetiGS
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Originally Posted by Apostolos View Post
Were you using the Techron before at all?

God bless,
David
I had just started using it. Without looking at my records, I put it in at 12,000 and 13,000 and it died at 13,4** It wasn't used up to that point.
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Old 06-22-2011, 09:56 PM   #532
JoelWisman
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Quote:
Originally Posted by YetiGS View Post
Heard from dealer a little while ago: fuel pump is shot. New one on the way.


Actually, what he said was that when they tried it this morning, it fired up. They read the codes and there were five "fuel pump fuse codes." After they ran it for a few minutes it threw another fuel pump fuse code.


They called BMW tech who said, "Replace the pump." I guess it's failing . . .


I'm not sure what all this means except that I'm getting a new fuel pump and will religiously use the Techron stuff.
The fuel pump is energized by the ZFE which can be thought of as a bunch of relays. The ZFE is smart as it measures how much power is being consumed by each thing it switches on. When current draw is excessive, the ZFE knows and switches it off to prevent whatever it switched on and its associated wiring from burning up. In this way the ZFE can also be thought of as a bunch of circuit breakers that reset automatically.

In your case, "fuel pump fuse codes." mean the ZFE detected excessive current flowing in the fuel pump circuit, or at least thinks it did.

The possible causes are.........

1: Bad ZFE that is crazy. This happens once in a blue moon, i've seen it exactly once, ever.

2: Damaged shorted wiring or connectors. I have never seen the factory harness short on an F8 yet, but have seen people wiring in extra things incorrectly to the fuel pump circuit and cause this code.

3: Bad fuel pump controller. I have seen this a few times, but it never caused this particular code, but in theory it could.

4: Fuel pump that is drawing excessive current cause its getting stuck or windings are shorting internally. This is the 800lb gorilla for this code, with rare exception it is always the cause of this code. And yes, BMW techron will usually prevent ethanol and water from causing the fuel pump to corrode and get stuck, but unfortunately, not always.

Your bike should be good as new shortly. Ride often and have fun:)
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I love and miss you Jeneca and I'm sorry.
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Old 06-22-2011, 10:05 PM   #533
YetiGS
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Quote:
Originally Posted by JoelWisman View Post
The fuel pump is energized by the ZFE which can be thought of as a bunch of relays. The ZFE is smart as it measures how much power is being consumed by each thing it switches on. When current draw is excessive, the ZFE knows and switches it off to prevent whatever it switched on and its associated wiring from burning up. In this way the ZFE can also be thought of as a bunch of circuit breakers that reset automatically.

In your case, "fuel pump fuse codes." mean the ZFE detected excessive current flowing in the fuel pump circuit, or at least thinks it did.

The possible causes are.........

1: Bad ZFE that is crazy. This happens once in a blue moon, i've seen it exactly once, ever.

2: Damaged shorted wiring or connectors. I have never seen the factory harness short on an F8 yet, but have seen people wiring in extra things incorrectly to the fuel pump circuit and cause this code.

3: Bad fuel pump controller. I have seen this a few times, but it never caused this particular code, but in theory it could.

4: Fuel pump that is drawing excessive current cause its getting stuck or windings are shorting internally. This is the 800lb gorilla for this code, with rare exception it is always the cause of this code. And yes, BMW techron will usually prevent ethanol and water from causing the fuel pump to corrode and get stuck, but unfortunately, not always.

Your bike should be good as new shortly. Ride often and have fun:)
Thanks for explaining that so well Joel. Makes me feel all warm and fuzzy (could be the margarita too though) knowing my bike should be GTG soon.


And do you ever sleep??
__________________
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'04 BMW R1150GSA, '04 KTM 625 SXC
"You had better bring an extra magazine. Yeti's amped up on weird shit are hard to bring down." Lonestar2112
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Old 06-22-2011, 10:11 PM   #534
JoelWisman
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Originally Posted by YetiGS View Post
Thanks for explaining that so well Joel. Makes me feel all warm and fuzzy (could be the margarita too though) knowing my bike should be GTG soon.


And do you ever sleep??
I try never to sleep when i'm this busy, it is very inefficient! Now, if I could only get my techs to do the same....

But i'm guessing it is mostly the margarita making u feel warm and fuzzy, which sounds good by the way, if only I had the fixings :(

ooo OOO, I have some baileys in the fridge :)

Disregard any further postings from me as drunken rambling
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Old 06-23-2011, 11:26 PM   #535
Apostolos
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Quote:
Originally Posted by JoelWisman View Post
I try never to sleep when i'm this busy, it is very inefficient!
Are you busy because there are a lot of bikes breaking down and coming in for service?

God bless,
David
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Old 06-24-2011, 12:28 PM   #536
Singletrack_mind
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Quote:
Originally Posted by JoelWisman View Post
P.S. For JR above, yes the k7x's have a fuel pressure regulator. It's in the tank. The description of the fuel pressure sensor function does not agree with my education or experience, but the description of failure symptoms is spot on. And yes the bike will run fine with it unplugged, indefinitely.


Joel, what's a k7x?

I was at the dealer yesterday, and the head mechanic told me had two other bikes in just yesterday alone for failed fuel pumps. He also told me that the fuel pump installed on my bike is a newly updated part, designed especially to resist ethanol damage. He told me this with no prompting from me, so I am hopeful it is true. Have you heard anything about this?
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Old 06-24-2011, 12:41 PM   #537
YetiGS
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Quote:
Originally Posted by Singletrack_mind View Post

Joel, what's a k7x?

I was at the dealer yesterday, and the head mechanic told me had two other bikes in just yesterday alone for failed fuel pumps. He also told me that the fuel pump installed on my bike is a newly updated part, designed especially to resist ethanol damage. He told me this with no prompting from me, so I am hopeful it is true. Have you heard anything about this?
I am hopeful this is the pump I am getting! I know they had to order me a new pump from BMW, they didn't have any in stock.
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"You had better bring an extra magazine. Yeti's amped up on weird shit are hard to bring down." Lonestar2112
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Old 06-24-2011, 01:06 PM   #538
JoelWisman
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Quote:
Originally Posted by Singletrack_mind View Post

Joel, what's a k7x?

I was at the dealer yesterday, and the head mechanic told me had two other bikes in just yesterday alone for failed fuel pumps. He also told me that the fuel pump installed on my bike is a newly updated part, designed especially to resist ethanol damage. He told me this with no prompting from me, so I am hopeful it is true. Have you heard anything about this?
Haven't heard a thing about the fuel pump being redesigned, but if so, that's fantastic

As for "K7x". That's the bike series. K7x = all twin cylinder f650gs, f800gs, f800st f800s and f800r
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Old 06-25-2011, 09:34 PM   #539
Singletrack_mind
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[QUOTE=JoelWisman;16244669]Haven't heard a thing about the fuel pump being redesigned, but if so, that's fantastic

My part number for this new fuel pump was either 16-14-7-720-778 (identified as "Fuel pump. electron") or 16-14-7-723-151 (identified as "Fuel Pump unit with depends on year")

Those are exactly the same two PNs that were listed back in August of 2010 when this happened to me the first time and both were replaced.

If BMW improves something like the fuel pump, and it becomes standard issue replacing the first model, does the PN get changed or not?
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Old 06-25-2011, 10:18 PM   #540
YetiGS
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My fuel pump was just replaced today. Part no. 16-14-7-723-151.


My bike is back in my garage where it belongs!!
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'04 BMW R1150GSA, '04 KTM 625 SXC
"You had better bring an extra magazine. Yeti's amped up on weird shit are hard to bring down." Lonestar2112
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