Alternative Fuel Pump ~ original poster wmax351

[ckp]

I never did find the number for an aftermarket strainer  so I used a spare I had for a 1995 Corvette along with the insulation sleeve GM uses. Replaced those along with a KL145 filter and my pump is quiet now. It had little fuel in it. I drove it around a bit before I filled it up and took it for a good test ride, about 75 miles. It was quiet the whole time. I can actually hear the exhaust at a stop light. I have a spare HFP439B I will put in the tool compartment.

[Martin]

Link to $36.00 Au Chinese fuel pump can be had cheaper, but I went with a manufacturer. A lot of debate on whether these are any good so I decided to do a bit of research and give it a go. Chrisguzzi is running a different Chinese pump see this for differences. http://www.motobrick.com/index.php/topic,10054.msg85798.html#msg85798
https://www.aliexpress.com/item/for-BMW-K-Ducati-K75-K100-K1100-K1-1983-1997-BOSCH-16121461576-16121460452-0580-463-999/32784411992.html?
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.OEM pump 180 ml over 5 sec equals 2.16 litres per min.
New pump  325 ml over 5 sec equals 3.9   litres per min.

Regards Martin.

[woodgeek]

I bought one of those $20 BMW K75 fuel pumps found on eBay and carry it in my tail cowl.  I can't say how well it works, but I operate on the principal that when you carry a spare, that part will never fail.  So far it has worked.

The only issue with the replacement is that it does not use the ring terminals found on the OEM pump, but rather 1/4" spade terminals.  One of these days I have to get ambitious and set up the in tank wiring to expedite the change over.

As a new K100 owner, I'm a little unnerved hearing how many spare parts some owners carry with them. Reminds me of my time owning a Jeep CJ5. One time on the highway part of my shift linkage dropped off. Luckily I had my tool set and my Craftsman 5/8" combination wrench substituted perfectly for the missing linkage.


So, what failures have you guys experienced? Do K-bike breakdowns happen a lot?

[The Mighty Gryphon]

At the risk of jinxing myself, I have done 28,000(54k to 82+k) solo cross country miles on my K75RT in the past 4 years.  I have been to 40 of the continental states so far and been in some pretty lonesome spaces.  So far, I have not had any problems beyond a blown heated grip fuse on that bike.

I carry with me easily changed parts that can be hard to come by that can leave me stranded for an extended time some place I would rather not spend a lot of time.  I also have an emergency rescue parts box at home ready to ship to where ever I happen to be stuck.

Yeah, I carry some stuff, but I am riding a 25 year old bike with 80,000 miles on it.  I enjoy riding it far from home, but I can't get off on sitting by the side of the road thinking about renting a U-Haul to get home.  These bikes are about as reliable as anything you can find, but things do fail, and you need to be prepared.

[woodgeek]

At the risk of jinxing myself, I have done 28,000(54k to 82+k) solo cross country miles on my K75RT in the past 4 years.  I have been to 40 of the continental states so far and been in some pretty lonesome spaces.  So far, I have not had any problems beyond a blown heated grip fuse on that bike.

I carry with me easily changed parts that can be hard to come by that can leave me stranded for an extended time some place I would rather not spend a lot of time.  I also have an emergency rescue parts box at home ready to ship to where ever I happen to be stuck.

Yeah, I carry some stuff, but I am riding a 25 year old bike with 80,000 miles on it.  I enjoy riding it far from home, and I can't get off on sitting by the side of the road thinking about renting a U-Haul to get home.  These bikes are about as reliable as anything you can find, but things do fail, and you need to be prepared.

That makes sense. Thanks for the perspective. I travel the same way with our Ford Transit when we're on family vacations. Now I need to decide if I want to pick up a K-bike tool kit on ebay or assemble my own.

[Motorhobo]

I just ordered this as a replacement for the 1990's Ford Escort fuel pump which I've been running for over 60k miles without a problem.

https://www.ebay.com/itm/EFI-In-tank-Fuel-Pump-for-1984-1996-BMW-K75-K75C-K75RT-K75S/263160533853?hash=item3d4597135d:g:ZAQAAOSwvZVZm7Rn&frcectupt=true

This looks like an an exact replacement of that pump and includes the strainer which fits into the recess of the K tank albeit with a little bit of coaxing.

The reason I went with this one instead of the other reasonably priced OEM ones you can find on EME and elsewhere is that the terminals on this pump are different than the OEM and require changing out the terminals on the tank to match. Since I've already done that I didn't want to have to change them again to go back to the OEM style terminals, I wanted this pump but it didn't seem to be available as a Ford Escort or Ford replacement part anymore.

So if you're in a similar situation and are looking for that pump, here it is. If you're looking for a dirt cheap replacement pump this one is that, but it does require crimping on different terminals.

[The Mighty Gryphon]

Thanks for the link and the reminder that I need to make the modification to the fuel pump wires in the tank. 

The fuel pump I carry has 1/4" flat blade terminals, and as you all know, the OEM pump has ring terminals. 

My solution is to cut the wires at the end, removing the ring terminals and replacing the ring terminals with the female flat blade terminals that will connect to the replacement pump.  Then I'll make a pair of wires with male flat blade terminals that mate with the females on the tank wires.  The other end of the wire will have a ring terminal to attach to the OEM pump.

When and if I ever have to change pumps, all I have to do is unplug the wires going to the OEM pump, install the new one, and push the wires onto the new pump's terminals.  A nice no-tools-required electrical connection because jobs like this can never be too easy when you're at the side of the road and it's getting dark and raining.

[Motorhobo]

That's a good solution Gryph -- btw what did you do to shield that wiring? The spade connectors attach directly to this pump and some of the bare wiring is exposed... I don't know any way around that. Is there any danger having these bare wires exposed to liquid fuel and vapor?

[Laitch]

Is there any danger having these bare wires exposed to liquid fuel and vapor?

Oxygen concentrations within a fuel tank are low enough that ignition by spark is not possible. 

Vapors emitted from the tank can be ignited outside the tank where oxygen concentration is higher so disconnecting the battery before removing fueling components from the tank is good practice. Another good practice is not using the glowing end of a cheroot to see if there's fuel in the tank. Your view will be obstructed by flames. Just smother them with your riding jacket.  :giggles

[Motorhobo]

Thanks, Laitch -- I didn't know that. Guess I should stop lighting a match to see if there's any fuel left in the tank.

[daveson]

I get a strange feeling too when removing the pump wires with the filler cap opened. It goes against the grain. I touch my boots as well, to reduce the chance of static electricity.

[Laitch]

 :tinhat2

[daveson]

Consider it,  look into it before you dismiss it,  static electrickery really does exist.

[volador]

Fuel Pump 43mm 16141341231 , 16141464730 (Suppressed Noise), 16121464696

SIEMENS/VDO 405 052 003 002Z

Amazon listing #1

Amazon listing #2