Facet fuel pump

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Ed-950SER Erzberg
Posts: 7
Joined: Tue Oct 16, 2018 10:33 pm

Re: Facet fuel pump

Post by Ed-950SER Erzberg » Thu Oct 18, 2018 7:30 am

I have a Facet on my 950 SE. I installed it myself using the adapter bracket sold by ADVMachines, which facilitates installing the Facet where the original pump lived. Here's a link to that adapter plate :

http://www.advmachines.com/product_p/facetadpt_1001.htm

The first Facet I installed lasted less than 1,000 miles. The second Facet I installed has performed flawlessly for over 10,000 miles.

I believe the quality control on the Facet pumps is not as good as it could be, but admittedly my sample size is so small that it is statistically worthless. I also believe the Facet is not as tolerant of fuel which might contain particulate contaminants, such that enough such contaminants may cause the Facet to seize where a pump of the original type seems to be much more tolerant of dirty fuel.

I reckon the best fuel pump for most purposes is the original pump with a Dr. Bean optical trigger installed, as suggested by a gentleman who posted earlier in this thread. A "second best" choice would be the original pump with a spare set of mechanical trigger points kept on the bike. A Mikuni vacuum pump seems attractive but requires the petcocks be shut off if the bike will sit unused for more than a short time interval. The requirement for the petcocks to be shut brings me back to the original pump being the best choice, because the original fuel pump acts as a check valve so the petcocks do not need to be shut off, even for extended storage periods. There are numerous reports of the Dr. Bean optical trigger having very good reliability, and very few reports of problems.
Last edited by Ed-950SER Erzberg on Sat Oct 20, 2018 12:00 am, edited 1 time in total.

Ed-950SER Erzberg
Posts: 7
Joined: Tue Oct 16, 2018 10:33 pm

Re: Facet fuel pump

Post by Ed-950SER Erzberg » Thu Oct 18, 2018 7:46 am

Gravity WILL work to feed fuel to the carbs on a 950 SE if the fuel tank has sufficient fuel in it, but as the fuel level in the tank drops it will become impossible to use some portion of the remaining fuel. As the fuel level drops gravity will be unable to move the fuel to the carburetor float bowls because the float bowls are higher than the top of the remaining fuel and gravity doesn't move things "uphill".

The problem is the carburetors are mounted so high, relative to the fuel tank, that fuel must be moved UP in order to reach the carbs, once the fuel level has dropped beyond a certain point in the tank. Exactly what that level is I don't know, but it seems obvious that most riders won't like needing to refuel when the tank still has a significant amount of fuel left in it. The pump makes it possible to use nearly all the fuel in the tank, and that makes the pump a practical necessity, in my view.

Alon
Posts: 96
Joined: Wed Jul 20, 2016 1:51 pm
Location: Windsor, UK

Re: Facet fuel pump

Post by Alon » Sun Oct 21, 2018 8:32 am

I refuse to use anything apart from my stock fuel pump with the Dr Bean kit. Despite being an aircraft supplier, I agree that the build quality of facet has dramatically diminished over the past few years.
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Alon
KTM 950 Super Enduro
Www.tripleclampmoto.com - now expanded into Europe, 950SE solutions specialists

Ed-950SER Erzberg
Posts: 7
Joined: Tue Oct 16, 2018 10:33 pm

Re: Facet fuel pump

Post by Ed-950SER Erzberg » Mon Oct 22, 2018 12:07 am

Alon wrote:
Sun Oct 21, 2018 8:32 am
I refuse to use anything apart from my stock fuel pump with the Dr Bean kit. Despite being an aircraft supplier, I agree that the build quality of facet has dramatically diminished over the past few years.

I agree on the stock pump + Dr. Bean optical trigger being the best option. I said as much in my earlier post.

Having said that, if you get a Facet pump that happens to be a good one, it can give good service for a long time. The trouble is, until you install the Facet and use it for a while you don't know if it will be a good one or not. The second Facet I installed turned out to be a good one and it is working just fine as I write this. Until it fails I see no point in removing it from service ( I do carry a spare new Facet pump on long rides ). However I would not buy any more Facet pumps for a KTM ; I would instead buy a new stock pump and install the Dr. Bean optical trigger.

The fault with the stock pump lies in the crude breaker points which are used as a trigger for the pump ( the pump is a copy of an old Lucas pump, which those who have owned older British cars may recall with fondness due to the necessity for crawling under the car and striking the pump with a mallet to encourage the pump to resume working ). The points corrode and wear over time, and eventually stick such that they don't work as a trigger any more, so the pump quits working.


Here's a tip which might keep your bike working long enough to make it home, if your stock pump fails on a dark and stormy night :

Often on a 950 SE you can slap the left side of the fuel tank hard ( slap the tank as close as possible to where the pump is mounted ) with your hand and cause the points to come unstuck, and the pump will begin working again. I have done this while riding, without even stopping the bike. This trick might get you home if home is nearby ( often multiple slaps are required to encourage the pump to continue working ). When the pump starts working you can feel it working if you press your palm against the tank, which will enable you to feel the vibrations caused by the pump operating.
But the very first time the pump fails to operate it is time to replace at least the trigger points if not the entire pump, as soon as possible, to avoid being stranded.

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