Diagnosing bad fuel pressure regulator - Wrist Twisters
 
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post #1 of 10 Old 07-13-2017, 06:17 PM Thread Starter
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Diagnosing bad fuel pressure regulator

Hello all, I just picked up a 2004 919 with 9k miles on it. I've read something that can go wrong with them is the fuel pressure regulator. My bike has a bit of trouble starting, and isn't the best off idle, as well as the exhaust smelling gassy. I saw this video online as a way to diagnose a bad one


I propped my tank and tried to check mine this way and once i pulled the same hose back as in the video fuel started dumping out. Is this the fuel pressure regulator? is the vacuum line on the other side? thanks


Imgur Fuel pressure regulator link

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post #2 of 10 Old 07-13-2017, 07:35 PM
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Pull the smaller vacuum line of the other side, you shouldn't get any fuel out of it


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post #3 of 10 Old 07-13-2017, 07:41 PM Thread Starter
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Update: I wasn't able to get the hose off the other side, but did manage to get the closest vacuum line going into cylinder 2, which was the closest line to the fuel pressure regulator. No signs of gas leaking in, so just another case of me being paranoid.

Side note, should I increase the idle speed to get better off the line performance and starting? I don't use the choke when I start it, and when its cold it idles around 900-1000 and goes up to 1100-1200 when warm.

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post #4 of 10 Old 07-14-2017, 09:44 AM
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Just replace the FPR every 10 years regardless of whether you think it needs to be done or not.

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post #5 of 10 Old 07-14-2017, 09:45 AM
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Probably not a bad idea, I think mines starting to seep a little

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post #6 of 10 Old 07-14-2017, 09:51 AM
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Quote:
Originally Posted by johnfellows View Post

Side note, should I increase the idle speed to get better off the line performance and starting? I don't use the choke when I start it, and when its cold it idles around 900-1000 and goes up to 1100-1200 when warm.
That sounds right, don't change it for now. Can you share more info regarding your starting issues? Pc3?

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post #7 of 10 Old 07-14-2017, 10:21 AM Thread Starter
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Oh yeah so when the bike is warmed up it starts on the first crank even. But when it's cold it sometimes sounds like it takes 4 cranks or so to finally catch. The battery is new and the starter sounds loud like it's working right. Is this normal? I had a fuel injected sv650 before that didn't seem to take so long to start.

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post #8 of 10 Old 07-14-2017, 12:04 PM Thread Starter
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Oh also no power commander 3 or any modifications to the bike.

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post #9 of 10 Old 07-14-2017, 04:37 PM
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Maybe try, using choke (fast idle knob) when cold starting. Turn your idle up a bit. Check your plugs and replace if fouled, have a good look at plugs #2, #3. These will foul with a failed FPR. Replace FPR. Perhaps carry out a starter valve synchronization, this may help smooth out idle. Good luck mate.

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post #10 of 10 Old 07-21-2017, 12:44 PM
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Quote:
Originally Posted by LDH View Post
Just replace the FPR every 10 years regardless of whether you think it needs to be done or not.
Year 14 with my '03 at 78K and year 11 with the '06 at 29K.

I must be overdue.

Seriously, I would expect the smell of raw fuel and/or excessive fuel consumption if the FPR is failing.

I would run some Seafoam/StarTron/Techron for a few tank fulls and see if it clears up.



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