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 Fuel Pressure Regulator

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codge
Scooter Rider
Scooter Rider


Number of posts : 16
Location : Southampton UK
Points : 2667
Registration date : 2011-08-24

PostSubject: Fuel Pressure Regulator   Wed Nov 22, 2017 10:39 am

Hi All
Still trying to fix my non running Swing. Reading some of the previous posts about things to check, I got around to the FPR. I read that if the diaphram has hole(s) in it, then a new one is required. After removing it from the fuel rail, I cant even see the diaphram. The FPR does not come apart. All I can see is a thimble like piece with two machined slots in it.
Other than that there is nothing to see.
Can anyone tell me how they have seen a faulty perforated diaphram.
Many thanks, Codge
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The Bern
Silver Wing Expert
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Number of posts : 655
Location : Telford, UK
Points : 2190
Registration date : 2014-11-20

PostSubject: Re: Fuel Pressure Regulator   Wed Nov 22, 2017 12:04 pm

Hi bud, FPR is a non serviceable componant, but very simple in it's operation, basically, it uses vacuam to hold a diaphragm (which is normally closed) open, perferations in the diaphragm will obviously allow the vacuam to escape, thus the malfunction.
Ideally you would use this ... https://tinyurl.com/ya9f3z79  ... or similar to test how well it holds vacuam, for a rough guide you could just suck on the pipe


Last edited by The Bern on Wed Nov 22, 2017 12:13 pm; edited 2 times in total (Reason for editing : Shortened hyperlink with tinyurl)
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The Bern
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Number of posts : 655
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PostSubject: Re: Fuel Pressure Regulator   Wed Nov 22, 2017 12:11 pm

Also it might be an idea to check that the vacuam pipe is in good order, as a cracked/perished pipe will not operate the FPR correctly
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codge
Scooter Rider
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Number of posts : 16
Location : Southampton UK
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Registration date : 2011-08-24

PostSubject: FPR   Wed Nov 22, 2017 4:55 pm

Hi The Bern
I will do a bit of vacuum pipe sucking tomorrow, and give the pipes a good check over. I was told by a Honda mechanic that the FPR will be defective if the vacuum side of it has fuel in the pipe. It should be dry.
Mine was dry when I checked earlier today. However, I will look at them again.
My suspicion is still the petrol pump or the filter, but its so invasive I am leaving that to last.
Thanks anyway.
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siataukreg
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Number of posts : 137
Age : 64
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Registration date : 2014-08-24

PostSubject: Re: Fuel Pressure Regulator   Fri Nov 24, 2017 7:46 pm

codge wrote:
Hi The Bern
I will do a bit of vacuum pipe sucking tomorrow, and give the pipes a good check over.  I was told by a Honda mechanic that the FPR will be defective if the vacuum side of it has fuel in the pipe.  It should be dry.
Mine was dry when I checked earlier today. However, I will look at them again.
My suspicion is still the petrol pump or the filter, but its so invasive I am leaving that to last.
Thanks anyway.
If you need any of those parts i have them having broken up three scoots get back to me
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