Leak at Fuel Rail '07 F41000R - MVAgusta.net
 
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post #1 of 8 (permalink) Old 04-12-2018, 04:56 PM Thread Starter
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Leak at Fuel Rail '07 F41000R

Issue: Leak at fuel rails as soon as fuel system is pressurized. Used to occur only on very cold mornings but now whenever I try to start the bike even in warm temps. All new fuel lines from the fuel rails back to inside the tank and nice new Colder brass quick-disconnects. What/where are the orings at the fuel rail that are the likely culprit? Same orings as on the quick-disconnects (life probably isn't that easy). I know this can't be a new problem. I searched to no avail in the archives but did come up with this which shows the fuel rails.

http://www.mvagusta.net/forum/20-mai...brutale-2.html

Thanks in advance

LT Snyder
Owner - Desmo Times LLC
'07 F41000R
+ Some Harleys, KTMs, Aprilias, Buells, EBRs and Ducatis

Last edited by desmotimes; 04-12-2018 at 05:42 PM.
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post #2 of 8 (permalink) Old 04-12-2018, 05:42 PM
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What did you replace?

@desmotimes: I am assuming from your description that the leakage is at one of the boxes points. You state that your replaced the fuel lines. With what? Did you buy a factory set, or did you manufacture your own lines? You say you used new brass fittings so I assume you made your own lines. How did you salvage the John Guest (boxed in red) fittings?

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post #3 of 8 (permalink) Old 04-12-2018, 06:55 PM
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There are 2 seals.
One is inside the John Guest fitting where it clicks onto the fuel rail.
The other is an O ring that is on the male barb of the fitting where the hose pushes on.
You will have to have a good look to see exactly where the fuel is leaking from.


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post #4 of 8 (permalink) Old 04-12-2018, 07:11 PM Thread Starter
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Ah, you got me. No, I didn't replace the fuel lines external to the tank or the quick-disconnects at the fuel rail would have been problematic. Is it possible to eliminate the quick disconnects at the fuel rail and simply use oetiker clamps onto the fuel rail line extension?

LT Snyder
Owner - Desmo Times LLC
'07 F41000R
+ Some Harleys, KTMs, Aprilias, Buells, EBRs and Ducatis
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post #5 of 8 (permalink) Old 04-12-2018, 07:13 PM Thread Starter
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and of course, I'll have to spec out those orings. I just replied to silentservice to see if its possible to just eliminate the quick disconnects at the fuel rail and clamp the hoses to the fuel rail extension.

LT Snyder
Owner - Desmo Times LLC
'07 F41000R
+ Some Harleys, KTMs, Aprilias, Buells, EBRs and Ducatis
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post #6 of 8 (permalink) Old 04-12-2018, 08:34 PM
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yes you can connect the lines directly to the rails
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post #7 of 8 (permalink) Old 04-12-2018, 08:42 PM Thread Starter
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That's all I needed to know. Thx Number two. A "prisoner" reference? Nice.

LT Snyder
Owner - Desmo Times LLC
'07 F41000R
+ Some Harleys, KTMs, Aprilias, Buells, EBRs and Ducatis
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post #8 of 8 (permalink) Old 04-13-2018, 07:08 AM
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There are also other connections that work in place of the John Guest fittings. I'll find the link to those and post it here.

Here it is. Go to post 35. These are Dorman 800-185 Fittings. http://www.mvagusta.net/forum/23-sal...ittings-4.html

FWIW, I have 10 pairs of the CPC fittings for the fuel pump plate of pre 2010 bikes. If you want some, let me know.

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'07 F4 312R, '10 B4 1090RR, '15 B3 800RR
'07 Ducati Monster S4Rs, '07 Ducati Monster 695
2010 Harley Davidson Ultra-Classic Electra-glide CVO FLHTCUSEBLK
'63 Honda C100A Cub
'61 MVA TRA 125

Last edited by silentservice703; 04-13-2018 at 07:13 AM.
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