Fuel pump replacement today.

SniperX · 1 Fuel pump replacement today. Mon 18 Jan 2021, 09:55

SniperX

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I have the old one out, new one is hooked up to wires. If I turn the key on is the hot side supposed to go hot with just the key on? I tested power with the old pump and I read no voltage at the positive and negative wires on the old pump with the key in the on position. Is there a fuel pump specific fuse, or a relay?

92KK 84WW Olaf · 2 Re: Fuel pump replacement today. Mon 18 Jan 2021, 10:10

92KK 84WW Olaf

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You don't mention the bike type. But the fuel pump does have a fuse and does have a relay.

On some Ks the fuel pump and horn relay are interchangeable.

MartinW · 3 Re: Fuel pump replacement today. Mon 18 Jan 2021, 10:14

MartinW

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It won't go hot until you press the starter button. You need to include model and year of your Brick in your profile signature.
Regards Martin.

SniperX · 4 OOOPS! Mon 18 Jan 2021, 10:33

SniperX

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Number of posts : 171

All that used to be in my signature... Anyway it's a 1985 K100RT, 86K original miles, and I am replacing the packing and such as well as the pump, filter, and in tank submersible lines....

Point-Seven-five · 5 Re: Fuel pump replacement today. Mon 18 Jan 2021, 10:35

Point-Seven-five

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2 valve Jetronic bikes power up the fuel pump when the start button is pressed.

The later 4 valve Motronic bikes turn on the fuel pump for two seconds when the key is turned on.

SniperX · 6 Re: Fuel pump replacement today. Mon 18 Jan 2021, 10:38

SniperX

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Number of posts : 171

Point-Seven-five wrote:2 valve Jetronic bikes power up the fuel pump when the start button is pressed.

The later 4 valve Motronic bikes turn on the fuel pump for two seconds when the key is turned on.

Ok, sounds good. I'll test it with the start button pressed. Will it hurt anything if I just do a quick voltage test whilst the pump is in my hand as opposed to being installed? Just for a second or three?

SniperX · 7 Fixed my signature Mon 18 Jan 2021, 10:39

SniperX

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My bike information is in my signature now.

MartinW · 8 Re: Fuel pump replacement today. Mon 18 Jan 2021, 11:13

MartinW

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You can do a quick test without doing harm. However you don't want to create any sparks from either the wiring connections or from the pumps commutator. Sparks can result in a BIG BADDA BOOM. Wrapping a damp cloth around the pump may reduce the chance of blowing both you and your Brick up. Take care.
Regards Martin.

SniperX · 9 Re: Fuel pump replacement today. Mon 18 Jan 2021, 12:25

SniperX

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Number of posts : 171

MartinW wrote:You can do a quick test without doing harm. However you don't want to create any sparks from either the wiring connections or from the pumps commutator. Sparks can result in a BIG BADDA BOOM. Wrapping a damp cloth around the pump may reduce the chance of blowing both you and your Brick up. Take care.
Regards Martin.

I completely drained the petrol, and even cleaned out the entire inside of my tank as well. So no fuel to go BOOM! Thanks for the warning though!

92KK 84WW Olaf · 10 Re: Fuel pump replacement today. Mon 18 Jan 2021, 12:30

92KK 84WW Olaf

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SniperX wrote:

Point-Seven-five wrote:2 valve Jetronic bikes power up the fuel pump when the start button is pressed.

The later 4 valve Motronic bikes turn on the fuel pump for two seconds when the key is turned on.

Ok, sounds good. I'll test it with the start button pressed. Will it hurt anything if I just do a quick voltage test whilst the pump is in my hand as opposed to being installed? Just for a second or three?

But the 4v needs the side stand up for this to happen.

SniperX · 11 Re: Fuel pump replacement today. Mon 18 Jan 2021, 12:41

SniperX

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Number of posts : 171

92KK 84WW Olaf wrote:

SniperX wrote:

Point-Seven-five wrote:2 valve Jetronic bikes power up the fuel pump when the start button is pressed.

The later 4 valve Motronic bikes turn on the fuel pump for two seconds when the key is turned on.

Ok, sounds good. I'll test it with the start button pressed. Will it hurt anything if I just do a quick voltage test whilst the pump is in my hand as opposed to being installed? Just for a second or three?

But the 4v needs the side stand up for this to happen.

I work on it on the center stand, it's always started that way.

charlie99 · 12 Re: Fuel pump replacement today. Mon 18 Jan 2021, 13:25

charlie99

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a quick test wont harm anything
if looking for a longer test , just remember that fuel passing through the pump cools the whole thing , bearing wear could be an issue running it for long periods dry , windings also on the armature

just a heads up

SniperX · 13 Re: Fuel pump replacement today. Mon 18 Jan 2021, 13:26

SniperX

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I'd know right away.

Laitch · 14 Re: Fuel pump replacement today. Mon 18 Jan 2021, 13:41

Laitch

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SniperX wrote: Is there a fuel pump specific fuse . . .?

Yes.

moriarti · 15 Re: Fuel pump replacement today. Tue 19 Jan 2021, 05:28

moriarti

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Number of posts : 700

#9 NEVER EVER IS THE THE TANK FULLY PERGED AND FUME FREE affraid

You must use Co 2 gas or steam into the tank before and during working on it.
Sorry for being an old Scary Pants but i have the Tshirt with SCORCH marks.By its nature ALUMINIUM holds petroleum residue more than steel Thats why spirit tankers are S/STEEL.
Better to be safe than Singed Fuel pump replacement today. 112350

SniperX · 16 Re: Fuel pump replacement today. Wed 20 Jan 2021, 09:03

SniperX

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Number of posts : 171

The old packing for the pump mount is different than the new one...or vica verse. Is the new one the pictured one with the cut out on one side, going to be alright? Everything fits fine....

SniperX · 17 Re: Fuel pump replacement today. Wed 20 Jan 2021, 09:09

SniperX

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Number of posts : 171

The old packing for the pump mount is different than the new one...or vica verse. Is the new one the pictured one with the cut out on one side, going to be alright? Everything fits fine....

Laitch · 18 Re: Fuel pump replacement today. Wed 20 Jan 2021, 11:39

Laitch

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SniperX wrote:The old packing for the pump mount is different than the new one...or vica verse. Is the new one the pictured one with the cut out on one side, going to be alright?

That rubber component is called the vibration damper. Because it is next to both locking tabs, it will probably provide enough tension when the unit is locked into in the assembly to prevent vibration.

Who is the manufacturer?

JiiPee63 · 19 Re: Fuel pump replacement today. Wed 20 Jan 2021, 12:14

JiiPee63

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Number of posts : 67

SniperX wrote:

MartinW wrote:You can do a quick test without doing harm. However you don't want to create any sparks from either the wiring connections or from the pumps commutator. Sparks can result in a BIG BADDA BOOM. Wrapping a damp cloth around the pump may reduce the chance of blowing both you and your Brick up. Take care.
Regards Martin.

I completely drained the petrol, and even cleaned out the entire inside of my tank as well. So no fuel to go BOOM! Thanks for the warning though!

What could go wrong?, Sorry, I had to Fuel pump replacement today. 652573

SniperX · 20 Re: Fuel pump replacement today. Wed 20 Jan 2021, 12:28

SniperX

Silver member

Number of posts : 171

Laitch wrote:

SniperX wrote:The old packing for the pump mount is different than the new one...or vica verse. Is the new one the pictured one with the cut out on one side, going to be alright?

That rubber component is called the vibration damper. Because it is next to both locking tabs, it will probably provide enough tension when the unit is locked into in the assembly to prevent vibration.

Who is the manufacturer?

it is an original bmw part fische said it's the correct replacement

Laitch · 21 Re: Fuel pump replacement today. Wed 20 Jan 2021, 16:11

Laitch

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Number of posts : 3253

SniperX wrote:it is an original bmw part fische said it's the correct replacement

That must be comforting. Smile

Onward!

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1 Fuel pump replacement today. Mon 18 Jan 2021, 09:55

SniperX

2 Re: Fuel pump replacement today. Mon 18 Jan 2021, 10:10

92KK 84WW Olaf

3 Re: Fuel pump replacement today. Mon 18 Jan 2021, 10:14

MartinW

4 OOOPS! Mon 18 Jan 2021, 10:33

SniperX

5 Re: Fuel pump replacement today. Mon 18 Jan 2021, 10:35

Point-Seven-five

6 Re: Fuel pump replacement today. Mon 18 Jan 2021, 10:38

SniperX

7 Fixed my signature Mon 18 Jan 2021, 10:39

SniperX

8 Re: Fuel pump replacement today. Mon 18 Jan 2021, 11:13

MartinW

9 Re: Fuel pump replacement today. Mon 18 Jan 2021, 12:25

SniperX

10 Re: Fuel pump replacement today. Mon 18 Jan 2021, 12:30

92KK 84WW Olaf

11 Re: Fuel pump replacement today. Mon 18 Jan 2021, 12:41

SniperX

12 Re: Fuel pump replacement today. Mon 18 Jan 2021, 13:25

charlie99

13 Re: Fuel pump replacement today. Mon 18 Jan 2021, 13:26

SniperX

14 Re: Fuel pump replacement today. Mon 18 Jan 2021, 13:41

Laitch

15 Re: Fuel pump replacement today. Tue 19 Jan 2021, 05:28

moriarti

16 Re: Fuel pump replacement today. Wed 20 Jan 2021, 09:03

SniperX

17 Re: Fuel pump replacement today. Wed 20 Jan 2021, 09:09

SniperX

18 Re: Fuel pump replacement today. Wed 20 Jan 2021, 11:39

Laitch

19 Re: Fuel pump replacement today. Wed 20 Jan 2021, 12:14

JiiPee63

20 Re: Fuel pump replacement today. Wed 20 Jan 2021, 12:28

SniperX

21 Re: Fuel pump replacement today. Wed 20 Jan 2021, 16:11

Laitch

22 Re: Fuel pump replacement today.

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