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19-09-2021, 03:44 PM | #1 |
Registered User
Join Date: Sep 2010
Location: stourbridge
Bike: M750
Posts: 352
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'96 M750 Stupid Question Fuel Tap
I'm in the process of draining down my fuel tank as I have a leak to fix. I've accessed the fuel tap which is situated directly under the hinge at the back but I can't for the life of me see any means of turning the off fuel at the tap? Am I missing something really obvious? I've looked online and searched on here but can't see anything to help.
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19-09-2021, 04:10 PM | #2 |
Registered User
Join Date: Jun 2021
Location: Stratford Upon Avon
Bike: Multiple Monsters
Posts: 288
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After suffering two massive fuel leaks over the past few months, I am pretty sure you can't turn it off
Last edited by Jam911; 19-09-2021 at 04:12 PM.. |
19-09-2021, 04:39 PM | #3 |
aka Phil
Join Date: Nov 2005
Location: derry
Bike: M900
Posts: 376
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It's a vacuum tap. Fuel shouldn't flow through it when the engine is stopped.
Mine was faulty and i replaced it with a spurious brand tap. I also fitted an in-line tap on the fuel line just as a sure way to lock of the flow if needed.
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19-09-2021, 04:49 PM | #4 |
Registered User
Join Date: Sep 2010
Location: stourbridge
Bike: M750
Posts: 352
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Thank you.
It could be faulty then as fuel starts dribbling when I undo one of the pipes. I don't trust these vacuum taps-my old KH500 had one and I remember spending a Christmas eve desperately draining the tank after it leaked. Think I will replace with one you can manually turn on and off for peace of mind. Anyone recommend something that will do the job please? |
19-09-2021, 06:30 PM | #5 |
aka Phil
Join Date: Nov 2005
Location: derry
Bike: M900
Posts: 376
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fuel should only dribble from the pipe that comes off the tank outlet.
It's a while ago now so i can't remember the exact details but I replaced mine with a cheap vacuum tap that cost less than a tenner online. The Ducati replacement was something like 70 quid or so I think. I also fitted a simple universal in-line fuel tap down stream of the vacuum tap where i can reach it easily. I just searched online, think I ended up getting both on ebay.
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19-09-2021, 06:33 PM | #6 |
Registered User
Join Date: Sep 2010
Location: stourbridge
Bike: M750
Posts: 352
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Thanks. What confused me is the Haynes manual says before removing the tank to turn off the fuel!
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19-09-2021, 07:00 PM | #7 |
No turn left unstoned
Join Date: Jun 2010
Location: leicester
Bike: M750
Posts: 4,546
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Earlier monsters had a manual fuel tap.
Not sure exactly when they changed over but if your '96 750 has a vacuum tap I'd guess its one of the first to have one. Or else a previous owner has swapped over. |
19-09-2021, 07:26 PM | #8 |
Registered User
Join Date: Sep 2010
Location: stourbridge
Bike: M750
Posts: 352
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Thank you-yes I thought it should have been a manual one from my limited investigations.
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20-09-2021, 07:01 AM | #9 |
Fanactical volunteer
Join Date: Oct 2003
Location: Kent
Bike: M900
Posts: 9,033
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Early ones had the knurled round tap. Rotate it to shut off like a tap. Later had the black plastic switch one in the frame space above the rear brake pedal clutch side.
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20-09-2021, 08:21 AM | #10 |
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Join Date: Sep 2020
Location: Nairn
Bike: S4r
Posts: 99
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I'm pretty sure the vacuum tap is correct for the bike. There would have been mounting lugs on the frame if it had a manual tap from the factory which are not there.
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20-09-2021, 03:27 PM | #11 | |
Too much time on my hands member
Join Date: Jun 2007
Location: Forest Of Dean
Bike: S2r
Posts: 3,196
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Quote:
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20-09-2021, 04:27 PM | #12 |
Registered User
Join Date: Mar 2010
Location: Beachtown
Bike: M900
Posts: 2,188
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I’ve never had the vacuum tap leak (touch wood) on my 1997 900 but I did replace it when it was about eighteen years old as part of a fuel system refresh I did to combat the effects of modern fuel (the fuel pump diagrams were completely shot) as my bike began suffering from a vapour lock in very hot weather/heavy traffic conditions that caused it to cut out due to fuel starvation.
I Know people have changed them in favour of a manual tap but at less than thirty quid (that’s some price increase if they’re £70 now) from Moto Rapido and given the original had been reliable I didn’t see much point in deviating from that set up and I’ve had no issues since no matter how hot it’s got or how or where it’s ridden. It’s this fella you’re talking about yes? Remember one pipe (not fitted in the photo) is the feed from the fuel tank so fuel will flow from there as you undo it, then the centre is the supply to the vacuum fuel pump and the last, smaller diameter one on the side is the vacuum pipe from the cylinder inlet manifold.
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You're perfect, yes, it's true- But without me you're only you! Last edited by Flip; 20-09-2021 at 04:38 PM.. |
20-09-2021, 05:00 PM | #13 |
Registered User
Join Date: Sep 2010
Location: stourbridge
Bike: M750
Posts: 352
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Quote:
Looks a bit like a shrunken horn. I take it this is the type you can't turn off? The fuel pump was serviced by the PO Nick (enbee23). |
20-09-2021, 05:04 PM | #14 |
Registered User
Join Date: Sep 2010
Location: stourbridge
Bike: M750
Posts: 352
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Yes even the old fuel used to dry up and crystallise in the carbs if left long enough as well.
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20-09-2021, 05:10 PM | #15 |
Registered User
Join Date: Sep 2010
Location: stourbridge
Bike: M750
Posts: 352
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Thanks Nick. It's been 12 months since I bought the bike and I have to say I'm still very pleased I did. I don't think I've ever owned a bike with more character than this!
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