I'm thinking that my fuel pump may be on it's final rinse and should be replaced..However after a look through the available (used and new) market i'm curious as to why the pump can't be mounted external to the tank?.. I've seen inline electric pumps that are miniscule compared to the beemer bilge dumper and am curious as to putting one of these units into play..they are not as big as a fuel filter..the bottom of my tanknever has any sploodge or aqua in it; so...? Any thots???

Hi there, maybe an external one will make the job, but the in tank saves space (scarce on board) and work better because fuel works as coolant and lubricant. There are many in tank pumps in the market that can be fitted to our Ks, search the forum and youll find plenty on the subject, and of course any doubts we will be happy to help.
Best regards
JAP

I have just had to replace mine. If I can get another 22 years out of it I will be happy. (and 77 years old!)
I'm inclined to agree with Jap. If it ain't broke, don't fix it.
If it is, there are plenty of alternatives.
I found wthat with my wheel swap project, every time you solve one problem another is created so I've shelved the idea for now and getting out on the road!
What makes you think its on its last legs?
You don't normally get any warning.

hi david ..the only reason i could find for having an intenal fuel pump was that they generically dont have what is called a self priming ability ...when you run low/out of fuel there is nothing to do till you can feed the intake of the pump with fuel, ie blowing in the tank maybe to force the new fuel through to the pump , one would have to redesign the fuel feed so that i became a gravity feed system with the outlet near the bottom of the tank ....not some distance higher like on our bikes ...not a big issue but something to concider other wise you might find some form of diaphram type pump that can pump air as well

Hi David,
When looking at pumps it is important to remember the fuel pump has to pump at over 36 psi and reasonable flow rates, smaller pumps will in general have smaller capacity and pressure.
Regards,
K-BIKE

With the great information offered in this forum as to affordable replacement fuel pumps, I could not find myself trying to fit an external pump. I got a replacement pump (fitment as described in other posts) off Ebay for $23 US shipped to my home. Took a few minutes of adaptation to secure it in the tank (a bit smaller diameter than OEM), but with a new pump, screen and hoses I got by quite inexpensively.

Hey Loner, welcome to the forum.

Any more info (pics, links) about this fuel pump?

Yes Loner, name names. This comes up regularly on the forum and we are interested in more details. Do you know what the pressure rating is?

Hi Loner, yes spill the beens mate name and ratings all helps.

BIG D

Here's another replacement pump for all of you K100 owners with fuel pump OCD.
Another thread had mentioned that a model of Peugeot used the same pump. Well lo and behold, there was one on eBay that week from an '86 205 GTI 1.9.
£15 / $25 and it was mine.
Made in France by Bosch, perfect fit and looks identical. The only difference being that it has a permanent ALUMINIUM strainer on the bottom of the pump. An improvement on the nylon one as the original strainer on my bike was in tatters when I removed the pump for the first time after the damper disintegrated. May have contributed to the eventual demise of the first pump.
Well, now I have a spare pump as the reason I bought it was to replace the new, Italian made clone which I believed was causing running problems because it was too low pressure.
It was a faulty plug! One of a new set of Bosch plugs made in Brazil.
Now running perfectly with new set of NGK's.
If in doubt, start with the cheapest component.

Excellent news Comberjohn...and yes, there a people (me included) who think the worst when a problem appears.

Thanks for passing on the info.

Comberjohn makes a hugely important point that most of us tend to think the worst and dive in without thinking it through and fixing the cheap simple stuff like a spark plug which are throwaway items anyway.

I recall a friend who against my advice and that of others took his expensive but elderly car to an auto-electrician for repair due to misfiring, after replacement of the whole fuel injection system, the engine management computer and all hugely expensive plug leads at a cost approaching $10,000 and still had the problem they replaced the rotor arm which had a crack in it and was intermittently shorting down. A very expensive lesson.
Regards,
Jeremy

I'm wondering if the PUG Gti fuel pump you bought is either of these Bosch OEM part numbers? 0 580 310 015 or 003
Thanks.

K-BIKE wrote:Comberjohn makes a hugely important point that most of us tend to think the worst and dive in without thinking it through and fixing the cheap simple stuff like a spark plug which are throwaway items anyway.

I recall a friend who against my advice and that of others took his expensive but elderly car to an auto-electrician for repair due to misfiring, after replacement of the whole fuel injection system, the engine management computer and all hugely expensive plug leads at a cost approaching $10,000 and still had the problem they replaced the rotor arm which had a crack in it and was intermittently shorting down. A very expensive lesson.
Regards,
Jeremy

true that k-bike .....
i had what sounded to me like a output shaft issue ...or altenator monkeynuts ....
the apparent noise got worse over a period of time .....and mostly at startup ....after running for a while it was less apparent
my mind was in tatters ....and not looking for a full pull down of the motor just yet .

pulled the plugs and the ignition leads (just before a meetup and ride with locals (twb )
plugs were still wettish from "enriched mix" .... but found 1 high tension lead ...with zero conductivity

$6.00 common replacement lead has the beast burbling nicely again .

now preparing for some new leads all through .

who would have thought ?

Sorry TWB. Didn't think to take note of the number. Was concerned to see if I'd bought a pup!

0 580 463 999 is the correct Bosch part number for the BMW 52mm diameter fuel pump, which is part number 16 12 1 461 576.

I'm forever attempting to cross reference Bosch to BMW part numbers (and compiling them for later on) to see what fits what....it's rainy day money spent wisely.

Some of you have probably seen this bloke's fuel pump replacement story:

http://hrsbstaff.ednet.ns.ca/bvogel/K100/download/Fuel%20pump%20replacement%20K100.pdf

Certainly worth a try for a replacement http://www.euromotoelectrics.com/SearchResults.asp?Search=FP-231KIT

This is the pump I have used for several Bricks http://www.ebay.com.au/itm/Ford-Falcon-EB-V8-5-0L-SEDAN-Electric-Fuel-Pump-/220765834387?pt=AU_Car_Parts_Accessories&hash=item3366ab4c93

K-freak,

Don't know if you got your information from Motobrick but...someone posted the same information as yours today along with the suggestion of using the Purolator Facet 38mm fuel pumps (available from Napa and ebay very cheaply) along with the Euromotoelectrics' K100/K75 37mm-52mm foam adapter. This combination represents the same kit sold by Motoeuroelectrics as you've referenced above.

Interesting timing if not.

Sure did

because BMW puts their line filter after the pump, any small piece of debris will lock the pump with embarrassing results on the side of the road.

the fix is so stupidly easy.

pull it out of the tank and reverse polarity on it for about 10 seconds.

works like a charm.

happened to me after i filled up at a gas station with crappy gas.

took me an hour to figure it out and 3 minutes to fix it.

I hope that it is okay to post a link to another forum? If not please be gentle.

There is a post (by me) in this thread, that shows how to use a $19 ebay fuel pump in a k75. I also made up a spacer to fit it into the original spot.

:afro:

mikeeeee wrote:because BMW puts their line filter after the pump, any small piece of debris will lock the pump with embarrassing results on the side of the road.

the fix is so stupidly easy.

pull it out of the tank and reverse polarity on it for about 10 seconds.

works like a charm.

happened to me after i filled up at a gas station with crappy gas.

took me an hour to figure it out and 3 minutes to fix it.

There should be a 6 micron filter pre pump and most of the pumps will pass up to 8 micron so you probably had a busted prefilter which is not uncommon with the OEM pumps or the vent tube was off or broken which once again is not at all uncommon considering the age of some of the pumps and bits

mjydrafter wrote:I hope that it is okay to post a link to another forum? If not please be gentle.

There is a post (by me) in this thread, that shows how to use a $19 ebay fuel pump in a k75. I also made up a spacer to fit it into the original spot.

:afro:

It's ok to post links like that but our fearless leader might get upset if you post some naughty links but he might look first

Interesting timing for this thread. I was on my way home Thursday and thought I felt the bike stutter for a split second. I chalked it up to a wind gust and kept going. 10 minutes later I noticed that, with 1/2 a tank of fuel, the fuel pump was making A LOT of noise. Much more than I was use to. About three blocks from my house I felt that same stutter and this time I knew it was not the wind.

Could this be a failing pump or could it be clogged as mentioned above?

That can often be the first sign of a failing pump.
Check all the connections first, especially the 4 pin plug at the tank as these give trouble from being disturbed more often than they like.

Long(-ish) story this...

When rebuilding after the clutch replacement on the K1100LT, we made a bit of a gaffe. Apparently ready to restart the engine, we powered up the ignition, only to get a strange, rapid chattering noise from the fuel pump. This happened every time the key was turned, but the motor wouldn't start.

Tried switching the ignition on and off many times during our attempts to start the machine up, to no avail.

Erm... I then realised that the earth harness to the ECU Motronic unit wasn't connected to the battery

Connected this and got the usual "whizz" from the pump and the engine fired.

During a little ride today, I could hear the pump over the sound of the engine, at tickover. This is definitely not something I've managed to hear in the past. I could hear it even while wearing my crash helmet.

Question is, is the pump now trashed? The engine runs normally but I really don't like the idea of being stranded in the outside lane of the M25 in rush-hour. Been there, done that, scared the life outta me!

Any ideas folks?

From my experience with fuel pumps just replace it with the cheap ford pump or any pump that will pump the pressure and volume required, but definately the solid gold OEM pump.
If you have a search through the forum under ford fuel pump you will get a heap of info on it.

Well, had a little ride today, 36 mile round trip, 9 miles of motorway at legal ( )-ish sort of speeds and a further 9 on A roads. Nice. And no nasty happenings, everything worked well and the fuel pump seems to be doing its job.

However, still a bit uncomfortable about the noise it makes so had a look on fleBay and found this...

http://www.ebay.co.uk/itm/250745677644?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649

It says it's for a Porsche, amongst others, delivers 4 bar. Would 4 bar, (about 58+ psi) be a bit much I wonder??? Dunno what the original pump delivers.

keef

I believe the OEM pump puts out about 65PSI reduced to 35PSI...so your 58-60 PSI would be fine......and the price is great compared to one at the bottom of the page....personally I am running a smaller diameter ford pump...cheap also....
http://www.ebay.co.uk/itm/FUEL-PUMP-VOLVO-740-744-2-0-2-3-Turbo-0580464069-Petrol-Pump-1306932-285211/330804891560?_trksid=p2047675.m2109&_trkparms=aid%3D555012%26algo%3DPW.MBE%26ao%3D1%26asc%3D15990%26meid%3D8486630591878850271%26pid%3D100010%26prg%3D7588%26rk%3D3%26sd%3D250745677644%26

Is it just me, or do those two pumps look to be pretty much the same - apart from the hundred and sixty two quid price difference!!!

what I thought too....truth be told they probably came from the same factory but meant to be delivered to vastly differing vehicles....Volvo or Porsche....I say give the cheaper one a try....

keefk1100lt wrote:Well, had a little ride today, 36 mile round trip, 9 miles of motorway at legal ( )-ish sort of speeds and a further 9 on A roads. Nice. And no nasty happenings, everything worked well and the fuel pump seems to be doing its job.

However, still a bit uncomfortable about the noise it makes so had a look on fleBay and found this...

http://www.ebay.co.uk/itm/250745677644?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649

It says it's for a Porsche, amongst others, delivers 4 bar. Would 4 bar, (about 58+ psi) be a bit much I wonder??? Dunno what the original pump delivers.

keef

Its got the wrong fitting at the top you need an 8mm hose connection that clamps up and come directly up.
I will have a look around and see what I can find.

Check this out and you will see the top you need and it will do the job http://www.ebay.co.uk/itm/12V-Universal-Electrical-Fuel-Pump-/251240403808

Thanks chaps, I reckon I'll go for the one with the right fitting. Still the second cheapest I've seen around. How do they justify such enormous price differences on such items???

They dont have to justify the huge markup and while there are enough people quite willing to pay $180 or more for a pump they will keep selling them at that price.

Has anyone used the foam fuel pump adapter? How does it hold up?

I've been running a Chinese fuel since July of 2017, with no problems cost $36.00 Au. The only difference discernable is the Chinese one is heaps quieter. There are definitely varying qualities with the Chinese pumps. There have been reports apparently of failure straight out of the box, but I have been unable to find any reports. So although I and others have experienced no problems to date choose wisely, grasshopper. I chose the supplier I went with as they are a manufacturer.
Beijing Global Auto Parts is one of the leading trade companies in mainland China and a member of the Chinese Commercial Vehicle Parts Market Federation, specializing in commercial vehicle and diesel engine parts. We provide export services to many of our clients worldwide including the Middle East, Europe, Africa, and Southeast Asia. Meanwhile, we have established long-term relationships with over 20 leading diesel engine parts manufacturer in mainland China with effective quality insurance system, like Cummins, Caterpillar, Deutz, Perkins, Komatsu, Isuzu, Steyr and Kamaz.
 Our products include nozzles, elements, delivery valves, injectors, pistons, piston rings, cylinder blocks, cylinder heads, crankshafts, camshafts, turbochargers, fuel injection pumps and feed pumps. At the same time, we have good relationship with automotive companies in mainland China and our supplier, including FAW, DFM, CNHTC (Steyr, Howo), Foton (Auman), Shanxi (SX, Steyr), Yuchai, Weichai and DCEC (Cummins). With their assistance, we can provide pure China-made automotive parts and components.
For more information see http://www.motobrick.com/index.php/topic,10054.msg85798.html#msg85798
Regards Martin.

Thanks Martin. I’ve already purchased my fuel pump. It’s a Carter P74095. I’m just trying to figure out the best way to mount it. I’ve got my hollowed out factory fuel pump and the new vibration damper.

Sent from Topic'it App

Caution: the following post contains no words of wisdom, or useful information of any kind.

Per post 27 ante, I've been running any old cheap pump for a while now (actually the same cheap ford pump from a breakers - it hasn't yet failed) this was fitted to a turned up collar/spacer. Reason: OE pump or similar was way too expensive.

I still have a moron's understanding of fuel pumps - big ones (Bosch pattern - cheap copies around £20 on ebay) that can cool themselves and run externally, or small ones that need to run in the tank to keep cool (and need the collar/spacer)

Is it that simple, or can you get a 'small one' that runs externally?

cheers

External pump that is virtually identical to the OEM one. https://www.k100-forum.com/t13173-externally-mounted-fuel-pump.
Regards Martin.