Fuel pump help

[Pale Rider]

I’m looking at getting a fuel pump for my 2012 twin cam, looking on eBay the ones listed only seem to be for the earlier 06-08 bikes, or are they the same thing? Secondly should I avoid the cheap ones and go for something else, is there a particular brand that is good without going for a genuine replacement pump.

Second thing is the fuel pump control unit. I see on eBay I can get a plug thing that allows for connecting directly to the pump should the controller pack up, how does this work? as I would have thought this would result in over pressuring the system and doing some damage to something.

Thanks.

 

[Steptoe]

You can power the pump directly from the battery should the fuel pump controller fail, the fuel pressure is controlled by the fuel pressure regulator.. there are a few posts on the forum about making your own controller by-pass, it’s very simple.

 

[Pale Rider]

You can power the pump directly from the battery should the fuel pump controller fail, the fuel pressure is controlled by the fuel pressure regulator.. there are a few posts on the forum about making your own controller by-pass, it’s very simple.

Excellent I’ll go take a look, thanks.

 

[RadioFlyer]

As you probably know BMW wants to sell you an entire assembly but the parts are individually replaceable.

These pumps are OEM quality and a popular replacement.

Quantum Fuel Systems

The Authority in OEM Quality and Affordable Powersports Replacement Parts. Shop with confidence. Guaranteed fit, backed by a lifetime warranty.

www.highflowfuel.com

 

[Mistacat]

I have found that the ebay cheap pumps work well, in fact too well !!!.
The fuel pressure on the twin cam is 4 bar approx 60 psi this is controlled by the (mechanical) fuel pressure regulator.
There is also a pressure relief valve built into the fuel pump.
The ebay pumps that I have had problems with had a max pressure of over 120 psi and have a small orifice in the pump pressure relief valve, the consequence of this is that the pump is delivering more pressure / volume of fuel that the fuel pressure regulator can deal with, the result was too high fuel pressure.
At first investigating this I assumed it was a faulty fuel pressure regulator but turned out to be the pump.
Not the cheapest pumps but at a reasonable price are VDU pumps, who I believe make the OEM pumps these are I believe available from Motorworks.
Just for reference the pre- twin cam 04 - 09 bikes are 3.5 Bar fuel pressure, approx, 45 psi.

 

[Pale Rider]

Cheers guys and thanks for the help, do any of you know where i could get a blue plug like the fuel pump controller has so I can make up a bypass lead? Some on eBay but £14 plus postage for a little plug like that seems a little rich.

 

[Steptoe]

Cheers guys and thanks for the help, do any of you know where i could get a blue plug like the fuel pump controller has so I can make up a bypass lead? Some on eBay but £14 plus postage for a little plug like that seems a little rich.

I’ll have a look through my boxes of fecked electrical bit & bobs (they might come in handy one day) to see if there’s a controller. If (a big if) there is I’ll send it to you .. let you know tomorrow - I have several large boxes similar to this, the smallest relay box

 

[Pale Rider]

I’ll have a look through my boxes of fecked electrical bit & bobs (they might come in handy one day) to see if there’s a controller. If (a big if) there is I’ll send it to you .. let you know tomorrow - I have several large boxes similar to this, the smallest relay box View attachment 324323

Brilliant thanks!

 

[RadioFlyer]

The connector you need is a Tyco 3-828816-1 should you wish to Google other possible sources.

As the fuel pump draws around 7 amps you need to draw power direct from the battery and not the ZFE-controlled accessory port.

 

[Steptoe]

Brilliant thanks!

Your in luck.., not so much that I have one, but that I actually managed to find it - Pm where you want it sent, but doubt I’ll be going to a post office before Tuesday so no rush

 

[Pale Rider]

Your in luck.., not so much that I have one, but that I actually managed to find it - Pm where you want it sent, but doubt I’ll be going to a post office before Tuesday so no rush View attachment 324506

Hi, I’ve just tried to PM you but can’t seem to do it. Is it because I’m not a subscriber? Is there another way I can contact you?

 

[Steptoe]

Hi, I’ve just tried to PM you but can’t seem to do it. Is it because I’m not a subscriber? Is there another way I can contact you?

Ahh, I only support supporters of the forum

 

[Pale Rider]

Ahh, I only support supporters of the forum

No problem.

 

[seahorse]

Just cough up mate, worth every penny

 

[klj]

Just a thought. These plugs come without pins - which can cost even more than the plug itself. Is there enough free cable between plug and controller ( on a currently working set up ) to splice in a suitable inexpensive common plug and connector ( example shown £3.50 flea bay ) ? Then make up a lead with a common connector so it could be easily plugged in when needed?