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K100-forum.com » Technical, repair and troubleshooting » Fuel pump replacement today.

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1Back to top Go down   Fuel pump replacement today. Empty Fuel pump replacement today. Mon Jan 18, 2021 1:55 pm

SniperX

SniperX
Silver member
Silver member
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?

    

2Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Mon Jan 18, 2021 2:10 pm

92KK 84WW Olaf

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Life time member
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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.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

3Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Mon Jan 18, 2021 2:14 pm

MartinW

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.


__________________________________________________
1992 K75s
    

4Back to top Go down   Fuel pump replacement today. Empty OOOPS! Mon Jan 18, 2021 2:33 pm

SniperX

SniperX
Silver member
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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....


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

5Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Mon Jan 18, 2021 2:35 pm

Point-Seven-five

Point-Seven-five
Life time member
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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.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

6Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Mon Jan 18, 2021 2:38 pm

SniperX

SniperX
Silver member
Silver member
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?


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

7Back to top Go down   Fuel pump replacement today. Empty Fixed my signature Mon Jan 18, 2021 2:39 pm

SniperX

SniperX
Silver member
Silver member
My bike information is in my signature now.


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

8Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Mon Jan 18, 2021 3:13 pm

MartinW

MartinW
Life time member
Life time member
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.


__________________________________________________
1992 K75s
    

9Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Mon Jan 18, 2021 4:25 pm

SniperX

SniperX
Silver member
Silver member
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!


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

10Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Mon Jan 18, 2021 4:30 pm

92KK 84WW Olaf

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Life time member
Life time member
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.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

11Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Mon Jan 18, 2021 4:41 pm

SniperX

SniperX
Silver member
Silver member
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.


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

12Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Mon Jan 18, 2021 5:25 pm

charlie99

charlie99
VIP
VIP
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


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

13Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Mon Jan 18, 2021 5:26 pm

SniperX

SniperX
Silver member
Silver member
I'd know right away.


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

14Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Mon Jan 18, 2021 5:41 pm

Laitch

Laitch
Life time member
Life time member
SniperX wrote: Is there a fuel pump specific fuse  . . .?
Yes.

Fuel pump replacement today. Scree122


__________________________________________________
1995 K75 90,000 miles
    

15Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Tue Jan 19, 2021 9:28 am

moriarti

moriarti
Life time member
Life time member
#9 NEVER EVER IS THE THE TANK FULLY PERGED AND FUME FREE  affraid affraid 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


__________________________________________________
1984 k100 rs red/black VIN  0004449 Now sold to Olaf
    

16Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Wed Jan 20, 2021 1:03 pm

SniperX

SniperX
Silver member
Silver member
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....


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

17Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Wed Jan 20, 2021 1:09 pm

SniperX

SniperX
Silver member
Silver member
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....Fuel pump replacement today. Img_2014Fuel pump replacement today. Img_2014
Fuel pump replacement today. Img_2015Fuel pump replacement today. Img_2014
Fuel pump replacement today. Img_2015Fuel pump replacement today. Img_2014
Fuel pump replacement today. Img_2015


__________________________________________________
1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

18Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Wed Jan 20, 2021 3:39 pm

Laitch

Laitch
Life time member
Life time member
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?


__________________________________________________
1995 K75 90,000 miles
    

19Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Wed Jan 20, 2021 4:14 pm

JiiPee63

JiiPee63
Silver member
Silver member
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


__________________________________________________
1986 K100RS 0089906 (Red)
2008 HD Electra Glide Ultra Classic (pearl white&black)

Ex - 1984 K100RS (white), 1986 Suzuki GR650
    

20Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Wed Jan 20, 2021 4:28 pm

SniperX

SniperX
Silver member
Silver member
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

    

21Back to top Go down   Fuel pump replacement today. Empty Re: Fuel pump replacement today. Wed Jan 20, 2021 8:11 pm

Laitch

Laitch
Life time member
Life time member
SniperX wrote:it is an original bmw part fische said it's the correct replacement
That must be comforting. Smile Onward!


__________________________________________________
1995 K75 90,000 miles
    

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