Fuel Return Hose
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- Posts: 111
- Joined: Sun Jun 28, 2009 7:18 am
- model: 906 Paso
- year: 1989
- Location: New Zealand
Fuel Return Hose
I put my 906 back together after its repaint and tyre mods (which took about 4-5 months) and it didn't fire. Got spark, and fuel at the tap, so it's off with the tank and the airbox - and the carb is bone dry
The pump is pumping fuel up to the Y connection and then straight back to the tank via the return. The hose to the carb is not blocked and the float valve is not stuck.
There are two pipes poking out of the underside of the tank - I connected the return line to the front one, and the breather (I assume) to the rear. Have I mixed them up?
It seems to me that for the system to work there must be a pressure regulator in the return line - is it in the tank?
Sorry if this has been asked before. I had a look at the Weberology topic to see if the answer was there.
The bike ran fine before I laid it up so I put some fuel in the carby bowl and put the top back on and it fired instantly and ran well.
Hope someone can enlighten me on what I've done wrong!
Cheers, CB
The pump is pumping fuel up to the Y connection and then straight back to the tank via the return. The hose to the carb is not blocked and the float valve is not stuck.
There are two pipes poking out of the underside of the tank - I connected the return line to the front one, and the breather (I assume) to the rear. Have I mixed them up?
It seems to me that for the system to work there must be a pressure regulator in the return line - is it in the tank?
Sorry if this has been asked before. I had a look at the Weberology topic to see if the answer was there.
The bike ran fine before I laid it up so I put some fuel in the carby bowl and put the top back on and it fired instantly and ran well.
Hope someone can enlighten me on what I've done wrong!
Cheers, CB
Ducati 906 Paso
Kawasaki GPZ900R
Triumph Sprint 955
Kawasaki GPZ900R
Triumph Sprint 955
Re: Fuel Return Hose
Hey CB, The return hose should have a jet in it to control the fuel pressure.I think it goes to the front pipe on the tankColonial Boy wrote:I put my 906 back together after its repaint and tyre mods (which took about 4-5 months) and it didn't fire. Got spark, and fuel at the tap, so it's off with the tank and the airbox - and the carb is bone dry
The pump is pumping fuel up to the Y connection and then straight back to the tank via the return. The hose to the carb is not blocked and the float valve is not stuck.
There are two pipes poking out of the underside of the tank - I connected the return line to the front one, and the breather (I assume) to the rear. Have I mixed them up?
It seems to me that for the system to work there must be a pressure regulator in the return line - is it in the tank?
Sorry if this has been asked before. I had a look at the Weberology topic to see if the answer was there.
The bike ran fine before I laid it up so I put some fuel in the carby bowl and put the top back on and it fired instantly and ran well.
Hope someone can enlighten me on what I've done wrong!
Cheers, CB
- paso750
- paso grand pooh-bah
- Posts: 5558
- Joined: Sun Jul 18, 2004 12:00 am
- model: 750 Paso
- year: 1987
- Location: southern Germany
Re: Fuel Return Hose
yes, you did. Look at the user manual p.11.I connected the return line to the front one, and the breather (I assume) to the rear. Have I mixed them up?
Ken, what size is that jet ?
Re: Fuel Return Hose
The jet was factory fitted and it has 60 stamped on it.It looks like a dellorto carby jet.paso750 wrote:Ken, what size is that jet ?
I'm off to the shed to swap the return/overflow hoses over.
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- Posts: 111
- Joined: Sun Jun 28, 2009 7:18 am
- model: 906 Paso
- year: 1989
- Location: New Zealand
Re: Fuel Return Hose
Thanks paso750. I am unable to download the manual. I will connect it to the rear pipe tomorrow.paso750 wrote: yes, you did. Look at the user manual p.11.
Cheers, CB
Ducati 906 Paso
Kawasaki GPZ900R
Triumph Sprint 955
Kawasaki GPZ900R
Triumph Sprint 955
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- Posts: 111
- Joined: Sun Jun 28, 2009 7:18 am
- model: 906 Paso
- year: 1989
- Location: New Zealand
Re: Fuel Return Hose
Thanks for the info & photos Ken. I will check the jet is in place and hook it up with some new hoses. Fingers crossed!Duc906 wrote: Hey CB, The return hose should have a jet in it to control the fuel pressure.
Cheers, CB
Ducati 906 Paso
Kawasaki GPZ900R
Triumph Sprint 955
Kawasaki GPZ900R
Triumph Sprint 955
- paso750
- paso grand pooh-bah
- Posts: 5558
- Joined: Sun Jul 18, 2004 12:00 am
- model: 750 Paso
- year: 1987
- Location: southern Germany
Re: Fuel Return Hose
if the links in my downloads thread didn`t seem to work then just hit the refresh button of your browser otherwise try here http://ducatipaso.org/docs/906/manuals/
- higgy
- paso grand pooh-bah
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Re: Fuel Return Hose
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
- ducapaso
- paso grand pooh-bah
- Posts: 1097
- Joined: Sun Aug 01, 2004 12:00 am
- model: 750 Paso
- year: 1988
- Location: siena, italy
- Contact:
Re: Fuel Return Hose
I am not sure about (I'm a 750 owner) but fuel return has not both "Y pipe" and double pin under the tank. There is something I don't understand.
Return line should go to directly to the tank from the weber if you have the double pin.
Otherwise to the Y pipe located under the petcock, with the 0,60 jet in the connection.
You can also verify the intgrity of the small net filter inside the weber inlet, removing the 19mm brass nut.
If nothing works, stop the fuel return and leave the electric pump work for a while, to push the fuel inside the carb.
If the going get hard, pull away the airbox and spray some fuel inside the trhorttle bodies... just for a while and try start the engine
Return line should go to directly to the tank from the weber if you have the double pin.
Otherwise to the Y pipe located under the petcock, with the 0,60 jet in the connection.
You can also verify the intgrity of the small net filter inside the weber inlet, removing the 19mm brass nut.
If nothing works, stop the fuel return and leave the electric pump work for a while, to push the fuel inside the carb.
If the going get hard, pull away the airbox and spray some fuel inside the trhorttle bodies... just for a while and try start the engine
have a nice ride, Nicola
Black "DUKE" 751582
ex...Red "smooth" 753349
Black "DUKE" 751582
ex...Red "smooth" 753349
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- Posts: 111
- Joined: Sun Jun 28, 2009 7:18 am
- model: 906 Paso
- year: 1989
- Location: New Zealand
Re: Fuel Return Hose
Thanks - the problem is in my very slow dial-up download speed, not your files.paso750 wrote:if the links in my downloads thread didn`t seem to work then just hit the refresh button of your browser otherwise try here http://ducatipaso.org/docs/906/manuals/
CB
Ducati 906 Paso
Kawasaki GPZ900R
Triumph Sprint 955
Kawasaki GPZ900R
Triumph Sprint 955
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- Posts: 111
- Joined: Sun Jun 28, 2009 7:18 am
- model: 906 Paso
- year: 1989
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Re: Fuel Return Hose
Thanks Higgy. What is the "canister" the tank is supposed to vent to? My vent just hangs down behind the motor
Cheers, CB
Cheers, CB
Ducati 906 Paso
Kawasaki GPZ900R
Triumph Sprint 955
Kawasaki GPZ900R
Triumph Sprint 955
- higgy
- paso grand pooh-bah
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- Joined: Tue Jul 29, 2008 9:50 pm
- model: 907 I.E.
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Re: Fuel Return Hose
It is a charcoal canister used to remove volatile HC from the overflow air. I found one for mine cheap as it had been removed from my 906. Any canister from any bike will do. I think mine came from a 996 and I just zip tied it to the frame on the left side under the cover and ran the hose to it and from it. No more gas smell in the garage
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
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- Posts: 61
- Joined: Mon Dec 21, 2009 1:38 pm
- model: 906 Paso
- year: 1990
- Location: Grantham, Lincolnshire, England
Re: Fuel Return Hose
CB, my 906 is a UK spec bike and the vent pipe from the tank just vents to atmosphere as yours does behind the motor, nothing is missing from your bike, fit a cannister if you like? I know some American states (California) are very strict on emmisions and fit cannisters and a myriad of associated pipes, my garage smells like a petrol station anyway so i shall not bother, smells rather nice!
Good luck with your pipes, i must confess when i refitted my tank the sticker shown above above did confuse me for a while - 'Waste Fuel'??? 'Cannister'??? 'Fuel Return' and 'Vent pipe' would have been more of a clue!!!
Keep us posted on progress. Cheers Jon
Good luck with your pipes, i must confess when i refitted my tank the sticker shown above above did confuse me for a while - 'Waste Fuel'??? 'Cannister'??? 'Fuel Return' and 'Vent pipe' would have been more of a clue!!!
Keep us posted on progress. Cheers Jon
- ducinthebay
- paso grand pooh-bah
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Re: Fuel Return Hose
Is that jet in the return line needed? It seems that much of the problem with the Weber was too much pressure. Removing the jet would give you a lower pressure, but with plenty of flow. There will be some pressure from the resistance of the lines, and that would seem to be enough for the carb. No?
At least it works that way with the Dells.
Cheers,
At least it works that way with the Dells.
Cheers,
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
- higgy
- paso grand pooh-bah
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Re: Fuel Return Hose
No, read our Weber doc fix that weberIs that jet in the return line needed?
i must confess when i refitted my tank the sticker shown above above did confuse me for a while - 'Waste Fuel'??? 'Cannister'??? 'Fuel Return' and 'Vent pipe' would have been more of a clue!!!
way to many gas fumes bet you blow your clutch out with air as well,Don't you
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie