FPC Question - Solution?

leftofcentre

leftofcentre

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Just out of interest - what would happen if i permenantly removed and bypassed the FPC?

The pump runs at 100% all the time on the 1150 no? Same as on most fuel injected cars too. The fuel pressure regulator takes care of unused fuel and recircs it back to the tank no?

Your comments and knowledge appreciated.

Andy
 
leftofcentre said:
Just out of interest - what would happen if i permenantly removed and bypassed the FPC?

The pump runs at 100% all the time on the 1150 no? Same as on most fuel injected cars too. The fuel pressure regulator takes care of unused fuel and recircs it back to the tank no?

Your comments and knowledge appreciated.

Andy
Click to expand...

I cannot say for certain but these systems quite often have a safety feature built in such that if the bike crashes, falls over or the fuel lines break, then the pump would shut off to prevent a fire
You would certainly have an insurance issue IMO assuming you told them
 
trainman said:
I cannot say for certain but these systems quite often have a safety feature built in such that if the bike crashes, falls over or the fuel lines break, then the pump would shut off to prevent a fire
You would certainly have an insurance issue IMO assuming you told them
Click to expand...

Mine was still running on it's side after the crash.
 
Can't see why not, unless the ECU 'looks for' an FPC at startup, which I doubt.

I'm not aware of any cut-off systems on a GS, certainly not as part of the FPC - it's only a hefty diode circuit which governs the pump back to about 80% during normal running.
 
leftofcentre said:
Just out of interest - what would happen if i permenantly removed and bypassed the FPC?

The pump runs at 100% all the time on the 1150 no? Same as on most fuel injected cars too. The fuel pressure regulator takes care of unused fuel and recircs it back to the tank no?

Your comments and knowledge appreciated.

Andy
Click to expand...

What would happen?

You would waste an hour (or more, depending on your skills) taking it out, wiring up the alternative and then (maybe a day, a week or a month or two later) waste a further hour or more putting it all back as was when you realised what a silly waste of time the whole operation had been.

That's what.

Nurse.... Next please.....
 
What would happen?

You would waste an hour (or more, depending on your skills) taking it out, wiring up the alternative and then (maybe a day, a week or a month or two later) waste a further hour or more putting it all back as was when you realised what a silly waste of time the whole operation had been.

That's what.

Nurse.... Next please.....
Click to expand...

Andy, Ignore him, he treats all recent members with contempt.

It would run fine with a little more wear on the fuel pump as its running 100% of the time in stead of 80% (but then as the pump pretty much lasts forever then running at 1.2 x duty cycle won't make a realistic difference.

Yes the pressure release valve will still recycle unused fuel to the tank.

There is some disagreement on the forum as to which wire (yellow or blue) is positive. Some members have had theirs apart and measured it and even they disagree. Measure it yourself before you cut the old FPC out.

The insurance issue is up to you, but if you didn't tell them (and I wouldn't) then I douby they'd ever know - and if they did find out it would have to have contributed to an accident before it became an issue.

Hope this helps,
Mark
 
More wear and tear on the pump.
Would pull more power which would affect fuel consumption.

Mark, I think that was an unfair slur on Wapping. He is very even handed and does not single out new members. He's a twat with everyone equally ;)
 
littleredrooster said:
Can't see why not, unless the ECU 'looks for' an FPC at startup, which I doubt.

I'm not aware of any cut-off systems on a GS, certainly not as part of the FPC - it's only a hefty diode circuit which governs the pump back to about 80% during normal running.
Click to expand...

ok, thanks

still personally i wouldnt want the pump running full bore anytime the engine was not, i guess you could link it to the alternator charging signal etc but then makes the system as complex as the FPC does!
 
Wapping said:
What would happen?

You would waste an hour (or more, depending on your skills) taking it out, wiring up the alternative and then (maybe a day, a week or a month or two later) waste a further hour or more putting it all back as was when you realised what a silly waste of time the whole operation had been.

That's what.

Nurse.... Next please.....
Click to expand...

You sirrah have the patience of a feckin Saint :cool:
 
Would pull more power which would affect fuel consumption
Click to expand...

well yes, strictly speaking thats accurate, but at taking a guess at 40W for the pump, thats 1/20th of a horsepower, running one fifth of the time (the extra 20% as the FPC runs the pump 80% of the time anyway), so average it out to 1.25horsepower continuous. Probably not enough to worry about.

A Pedant
 
Wapping said:
What would happen?

You would waste an hour (or more, depending on your skills) taking it out, wiring up the alternative and then (maybe a day, a week or a month or two later) waste a further hour or more putting it all back as was when you realised what a silly waste of time the whole operation had been.

That's what.

Nurse.... Next please.....
Click to expand...

What makes you think id be putting it all back again??

Oh and ps :stopbeing

:D Andy
 
I'd suggest it throttles back the pump to limit the heat input to the fuel in the tank rather than just to reduce wear on the pump or save power. In doing so it ought to reduce the amount of vapour produced by the fuel and hence VOC emissions.
 
Wapping said:
Oh I don't know, I do try and spread it around in equal measure ;)
Click to expand...

To be fair to Wappers, he has an excellent tutorial knocking around somewhere (Font of all wisdom I think) explaining the work around, this is all you need to know . . or carry a spare!

I don't see the point in by passing it for the sake of it either! :thumb
 
bod said:
I don't see the point in by passing it for the sake of it either! :thumb
Click to expand...

Hmmn not so much the sake of it but more the saving of £80 odd a pop and the risk of being stranded (however temporarily). You know if its going to fail its likely to happen on the outside lane of a motorway, in heavy rain, on pulling out of a junction, whilst heading for the the ferry etc etc.

seems to me that said fpc causes more hassle than what it contributes :rob
 
leftofcentre said:
Hmmn not so much the sake of it but more the saving of £80 odd a pop and the risk of being stranded (however temporarily). You know if its going to fail its likely to happen on the outside lane of a motorway, in heavy rain, on pulling out of a junction, whilst heading for the the ferry etc etc.

seems to me that said fpc causes more hassle than what it contributes :rob
Click to expand...

Don't you think BMW would just do away with it & end the whole sorry tale if it wasn't required?
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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