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DB6 Fuel Lines cracked

 
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quikduk



Joined: 13 Aug 2016
Posts: 162
Location: Southern California, USA

PostPosted: Sun Nov 12, 2017 3:44 am    Post subject: DB6 Fuel Lines cracked Reply with quote

As I was checking the rear wiring re: my turn signal issue, I started taking more parts off and noticed that my fuel lines are cracked. This is likely due to the age but also likely to the crappy ethanol in our gasoline over here in California.

So here are my questions du jour.

1. Are these lines the same as the 1000cc Multistradas or are they Bimota specific?

2. Can I cut off the fuel clamps, change the hoses to some BMW silicone hose and install new crimp fuel clamps? If so, how do the lines come off the throttle bodies as I assume the tank ends are quick couplers?

3. Where do I find the tool and clamps for the new hoses?

4. Is there a specific pressure requirement for the hoses and clamps?

Thanks in advance.
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DB1RS2R



Joined: 21 Feb 2013
Posts: 31
Location: Oakland, California

PostPosted: Thu Dec 28, 2017 2:09 am    Post subject: Reply with quote

Hello,

1. I don't know this bike specifically but I imagine all the fuel lines are 8 mm (5/16") like most fuel injected European motorcycles.

2. I like to spread the squeeze style clamps open with an awl versus cutting them. I don't think anyone is using silicone fuel lines. I would install 13-14 mm screw type clamps with edges that are flared up so they don't cut into the fuel line when tight.

If your bike has quick disconnects, I highly recommend replacing any plastic male fittings with brass fittings as they tend to snap at the groove and spray large amounts of fuel everywhere. Females are fine (oh, they are indeed!).

Here's a website selling the proper fittings at excellent prices with Viton o-rings that can handle our California ethanol gasoline:

http://quickcouplings.net/osc/advanced_search_result.php?keywords=Viton&osCsid=b445f82e338d73a6b1d3b6d932108ddd&x=0&y=0

3. You can find the clamps and pliers online after some searching but I wouldn't bother. They're fast on the assembly line but reusable clamps are convenient.

4. Buy fuel line/hose at your local auto parts store. Just make sure it's hose for fuel injected vehicles (good for about 100-150 psi) not hose for carbureted vehicles. If any hose stays submerged in fuel, that's a different story and the hose is fairly expensive.

Let me know if you need clarification. Good luck!

Kind regards,
Adam
_________________
'86 Bimota DB1R
'62 Ducati 250
'69 Laverda 750 GT
'07 Piaggio MP3 250ie
'71 Jaguar E-Type FHC 4.2
Previous Bimota: '87 YB5
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vort28



Joined: 22 Mar 2010
Posts: 1782
Location: Northwest , UK

PostPosted: Tue Jan 02, 2018 5:08 pm    Post subject: Reply with quote

My DB7 lines went, looked for silicon ones but could not find fuel resistant ones. Ended up with replacing like for like as on the DB7 the clearance to tank etc was an issue so had to ensure OD was the same as originals.
As suggested the clamps can be sprung off, again I replaced with crimp ones due to clearance..
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