Author Topic: A Very Inexpensive Alternative Fuel Pump  (Read 13644 times)

Offline WayneDW

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A Very Inexpensive Alternative Fuel Pump
« on: June 24, 2015, 09:34:09 PM »
Ran across this posting yesterday and ordered one.  $35 and free shipping might be to good to be true, I will find out.  The seller sent me a very confusing "boiler plate" response email.  Stuff about needing to ship from the other side of the world and explaining why the shipping cost is so high.  (free shipping and from L.A.????).   Anyhow, I'll let you know if it is not what is advertised.  In the mean time there seems to only be one left if you'd like to take a chance too.
I don't need a pump now, but at that price thought it would be nice to have a spare handy if/when. :

http://www.ebay.com/itm/New-Intank-Fuel-Pump-for-BMW-K75-K75C-K75RT-K75S-1984-1996-Motorcycle-1A-/291498469695?hash=item43dea9a93f&vxp=mtr
  • Minneapolis, MN, USA
  • 1992 K75RT

Offline F14CRAZY

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Re: a very inexpensive fuel pump
« Reply #1 on: June 24, 2015, 10:13:13 PM »
I'd just get a Ford automotive fuel pump...I forgot the interchange but search for it here on the forum
  • Grand Rapids, MI
  • '87 K75C
'87 K75C w/ Pichler V1 fairing. LED's, CATZ driving lights, Audiovox cruise, LT top case, tons of other mods by Drake...


Offline TimTyler

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Re: a very inexpensive fuel pump
« Reply #2 on: June 25, 2015, 01:23:12 AM »
UPDATE - THIS E2042 PUMP WON'T WORK IN A K75/K100
(I'll leave the original post for context though.)


I bought something similar off Amazon a few months ago. Followed a link  from this forum. Just $16.

http://www.amazon.com/gp/product/B000C1KJJE

I'll keep it in the cowl and see if it works when my original fails.  :nono

Offline WayneDW

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Re: a very inexpensive fuel pump
« Reply #3 on: June 25, 2015, 08:47:47 PM »
Wow, you win, Tim.  good deal.
I love the french on the side of the box: "Bomba de Gasolina"
  • Minneapolis, MN, USA
  • 1992 K75RT

Offline Scott_

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Re: a very inexpensive fuel pump
« Reply #4 on: June 25, 2015, 10:18:40 PM »
Tim, will your existing pickup screen fit? How much more for one that fits if yours doesn't.
  • My Garage
1997 K1100LT 0302488 (R.I.P.)
1995 K1100LT 0302044
1997 R1100RT ZC62149
"One who does not ask questions is ashamed to learn" Danish proverb

Offline Chaos

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Re: a very inexpensive fuel pump
« Reply #5 on: June 26, 2015, 12:26:36 PM »
geez Tim, free shipping to boot!  I have to buy one now just to carry around.  If you have a spare the original will never fail! :yes
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
2012 Ural 2WD sidecar (BMW's bastard step child)

Offline F14CRAZY

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Re: a very inexpensive fuel pump
« Reply #6 on: June 26, 2015, 05:04:19 PM »
Anyone happen to know a for-sure automotive interchange in case one of us in stranded but is near an auto parts store or salvage yard?
  • Grand Rapids, MI
  • '87 K75C
'87 K75C w/ Pichler V1 fairing. LED's, CATZ driving lights, Audiovox cruise, LT top case, tons of other mods by Drake...


Offline rbm

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Re: a very inexpensive fuel pump
« Reply #7 on: June 26, 2015, 07:03:18 PM »
Hmm, Canadians are always being taken advantage of. :P  Amazon.ca has the same pump for $34.17 +$6.00 shipping.
  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline johnny

  • TrailBrakingThrottleWhacker
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Re: a very inexpensive fuel pump
« Reply #8 on: June 26, 2015, 08:13:31 PM »
greetings rbm...

i could meet you in sault ste marie with a system case of goods...

j o
  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline The Mighty Gryphon

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Re: a very inexpensive fuel pump
« Reply #9 on: June 27, 2015, 10:11:59 AM »
Rob, I'm just across the border at Niagara.  I'd be glad to bring one up for the chance to see your "Cream Dream" in the flesh.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue, '89 K100RS Special edition White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS "Moby Brick Too
'89 K100RS SE

Offline rbm

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Re: a very inexpensive fuel pump
« Reply #10 on: June 27, 2015, 12:17:04 PM »
I might take you up on that offer.  There's a bunch of guys here in the GTA and Hamilton planning a group ride to that neck of the woods in July timeframe.  Be great if you could join.
  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline The Mighty Gryphon

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Re: a very inexpensive fuel pump
« Reply #11 on: June 28, 2015, 02:17:49 PM »
Rob, meeting up sounds like fun.  Keep me posted on what the plan is.

I am going to order one of those cheap pumps to add to my spares cache.  Shall I order one for you as well?  Would definitely give me a reason for a ride up to the great white north.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue, '89 K100RS Special edition White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS "Moby Brick Too
'89 K100RS SE

Offline petermarek

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Re: a very inexpensive fuel pump
« Reply #12 on: July 26, 2015, 09:45:04 PM »
Folks...I completely refurbished (over 8 months) a 1985 K100RT with only 13k on the odometer. I knew the original owner - the mileage is real. It sat for ~15 years under a car port. I tore is down and cleaned and refurbished from the back to the front. A MAJOR maintenance spline lube, ALL fluids flushed and replaced, New steel brake lines and all new hoses - every hose was dry rotted.  New tires as well - the original ones where manufactured in November of 1994. And then there was the gas tank. It sat that whole time with a half of tank of gas. All the rubber parts had dissolved into essentially tar. I could pull the pump straight out without releasing the clips.

Thus, lots of alcohol and cramped hands and arms working in the tank finally brought it to like new condition - but the pump was jammed with the "Tar".

Doing the project on the cheap, I found the following on Amazon. $50, arrived in 2 days and is working GREAT!

http://www.amazon.com/gp/product/B00T5MKO6Y?psc=1&redirect=true&ref_=oh_aui_detailpage_o05_s00

Oh, BTW, lots of Glass Bead blasting as well....

  • Maryland, USA
  • 1985 K100RT
I ride a K 100 RT - say good bye to leg hair after 100 miles!

Offline jagarra

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Re: a very inexpensive fuel pump
« Reply #13 on: September 29, 2015, 10:36:25 AM »
Good morning guys,

I am new to this site, I do have a 1974 R series BMW but I am thinking about adding a k75 to the collection of bikes.  When I saw this thread and the fuel pump, I recognized it as the same type that I have in my 1976 Jaguar XJ6 series car.  Now you don't want the Jaguar price, I have found an exact replacement on an American car.  So if you are stuck somewhere, go the auto supply house and get a fuel pump for a early 70'S Chevy Vega.
I have added a link to Rock Auto showing the pump, this one was $20.00, others listed varied in price depending on manufacturer.  I used a 1973 Vega as the auto.

good luck,

gg

http://www.rockauto.com/catalog/moreinfo.php?pk=4026435&cc=1062032&jnid=465&jpid=4
  • Nevada
  • looking at one to add to fleet

Offline Scott_

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Re: a very inexpensive fuel pump
« Reply #14 on: September 29, 2015, 11:08:20 AM »
Reading the specs of that chevy pump, it is only rated for 6psi.... not enough for a K-bike injection system. Just FYI.

In '73 the vehicles were only carburated, so 6psi would be fine to pump the fuel from the tank to the carb bowl.
  • My Garage
1997 K1100LT 0302488 (R.I.P.)
1995 K1100LT 0302044
1997 R1100RT ZC62149
"One who does not ask questions is ashamed to learn" Danish proverb

Offline The Mighty Gryphon

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Re: a very inexpensive fuel pump
« Reply #15 on: September 29, 2015, 01:12:13 PM »
If you're looking for an inexpensive fuel pump, this one might fill the bill.

http://www.ebay.com/itm/331387290009?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue, '89 K100RS Special edition White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS "Moby Brick Too
'89 K100RS SE

Offline jagarra

  • Curious
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Re: a very inexpensive fuel pump
« Reply #16 on: September 29, 2015, 03:11:54 PM »
Scott,  Never thought about the higher pressure requirement for FI.  My Jag is carbureted so no issue.  Can you advise what the PSI requirement is for the fuel pump, so if I see another one like that, I will know.

thanks,

gg
  • Nevada
  • looking at one to add to fleet

Offline Scott_

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Re: a very inexpensive fuel pump
« Reply #17 on: September 29, 2015, 03:34:20 PM »
Well, the BMW spec for the 1100's is
9.9 gal/hr at 36.3psi or 45.9 l/hr at 2.5bar

The pump is most likely capable of 45-60 psi, but the pressure regulator(mounted behind the throttle bodies) reduces it down to the required pressure. The early regulators used a vacuum line to 1 of the TB's to control fuel pressure, the later regulators are pre-set with a spring and don't use vacuum.
  • My Garage
1997 K1100LT 0302488 (R.I.P.)
1995 K1100LT 0302044
1997 R1100RT ZC62149
"One who does not ask questions is ashamed to learn" Danish proverb

Offline jagarra

  • Curious
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Re: a very inexpensive fuel pump
« Reply #18 on: September 30, 2015, 12:38:22 PM »
That Airtex E2042 fuel pump has a pretty high output pressure.  Min is 80 psi with a max of 90 PSI.  Rock Auto also carries them as a close out item, price is $23.75.  They listed the specs on the pump.

gg
  • Nevada
  • looking at one to add to fleet

Offline woodgeek

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A Very Inexpensive Alternative Fuel Pump
« Reply #19 on: March 03, 2018, 11:56:16 PM »
I built this replacement using the hollowed out shell of my original fuel pump and a Carter P74095. There is a nitrile foam spacer between the aluminum shell and the Carter pump. The ends are potted with JB Weld.
  • Henderson, NV
  • 1985 K100RT

Offline rbm

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Re: A Very Inexpensive Alternative Fuel Pump
« Reply #20 on: March 04, 2018, 07:07:55 AM »
Woodgeek, The JB Weld potting will prevent fuel from getting to the pump to cool it off.  The nitrile foam spacer will act like an insulator as well.  I think there is a high chance the pump might suffer from early life failure because it overheats.
  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline Inge K.

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Re: A Very Inexpensive Alternative Fuel Pump
« Reply #21 on: March 04, 2018, 07:20:28 AM »
I would guess that all the fuel that passing through the pump would be sufficient to cool it.
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Online Laitch

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Re: A Very Inexpensive Alternative Fuel Pump
« Reply #22 on: March 04, 2018, 07:22:35 AM »
Let us know if it all works out for you, woodgeek.
  • Along the Ridley in Vermont.
  • 1995 K75 80,000 miles
I wept because I had no radials until I met a man who had no splines.
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Offline The Mighty Gryphon

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Re: A Very Inexpensive Alternative Fuel Pump
« Reply #23 on: March 04, 2018, 09:25:07 AM »
I would guess that all the fuel that passing through the pump would be sufficient to cool it.

+1.  I was going to say the same thing, but you beat me to it. 

If you stop to think of it, the pump generates about the same amount of heat as couple tail light bulbs.  it passes about 8 gallons/30 pounds of fuel an hour through it.  That is more than enough to carry away the heat regardless of what the fuel level is in the tank.  Also consider the fact that it is designed to operate at temperatures up to 150F which is enough to burn you if you touch it.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '91K100RS White/Blue, '89 K100RS Special edition White/Blue
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'91 K100RS "Moby Brick Too
'89 K100RS SE

Offline woodgeek

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A Very Inexpensive Alternative Fuel Pump
« Reply #24 on: March 04, 2018, 07:07:50 PM »
I had those thoughts about heat transfer coefficients of various materials while coming up with this design. The heat transfer coefficient of JB Weld is pretty good—I looked online but couldn’t find any hard numbers. I cut the nitrile foam in half so it’s only 1” wide, minimizing its insulation potential. Most of the fuel pump shell is in contact with JB Weld or exposed to fuel. Anecdotally, I don’t know how many fuel pumps actually die from overheating. I was more concerned about the flimsy BMW pre filter not keeping garbage out of the fuel pump. Regardless, I will keep everyone updated, whether the pump lasts three weeks or three decades. [emoji6][emoji106]
  • Henderson, NV
  • 1985 K100RT

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