Ducati Gas Tank Fuel Line Split in Half - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 16 (permalink) Old Jun 11th, 2019, 7:53 pm Thread Starter
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Question Ducati Gas Tank Fuel Line Split in Half

Hi guys. I have a 98' Ducati ST2, and I have an issue inside the fuel tank: I discovered that a hose came off the fuel pump while I was riding about 2 weeks ago. After getting it back into my garage, pulling the bottom assembly out, and seeing that it was a disconnected hose, I decided to replace the old lines with new ones and obviously replaced the bottom o-ring. I put it all together (and yes, I replaced the hose line with submergible line), and maybe 2 days later: same damn thing happened again.

I got it back to my garage, pulled everything out again, and noticed that one of my new hose lines has literally split down the middle the entire way. I assume this is pressure, but I am somewhat at a loss here. Any suggestions? clogged fuel filter? bad fuel pump?

I'll try to get photos up soon.
Thanks.
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post #2 of 16 (permalink) Old Jun 11th, 2019, 8:01 pm
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I moved your thread to the Sport Touring forum, please read this on why it is not permitted in the Hall Of Wisdom forum: https://www.ducati.ms/forums/80-hall...means-you.html

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post #3 of 16 (permalink) Old Jun 11th, 2019, 9:39 pm
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Not uncommon with Ducati's...or KTM's...

https://www.ducati.ms/forums/56-supe...-wont-run.html

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post #4 of 16 (permalink) Old Jun 12th, 2019, 3:55 am
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You did use pressure hose right?

If you cant fix it with a hammer, its probably electrical.
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post #5 of 16 (permalink) Old Jun 12th, 2019, 8:47 am
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Quote:
Originally Posted by Chuckracer View Post
Not uncommon with Ducati's...or KTM's...

https://www.ducati.ms/forums/56-supe...-wont-run.html
I read the thread you provided the link for. What I'm cornfused about is ~why~ is this a "common issue"? I mean, I have a ten year old FI vehicle with over 60k miles on it that hasn't had this trouble (aw hells bells, best knock wood!!).

So why is this issue a common problem on Ducati motorcycles?

Lastly, is this also an issue for 1996 900CR (carbed)? I just purchased one of those about a week ago with 17k miles on it.

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post #6 of 16 (permalink) Old Jun 12th, 2019, 2:05 pm Thread Starter
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I did, but I just ordered 5 feet of super submersive, extreme high pressure hose line. The only other option would be to buy nylon braided metal hose, but I feel that would be very overboard. I'm just trying to figure out if there is a reason why the pressure was too much. Could it be something my bike is doing? Fuel pressure regulator? Fuel filter? I'm at a loss.
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post #7 of 16 (permalink) Old Jun 13th, 2019, 3:34 am
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Maybe blocked or faulty regulator. Can you measure the fuel pressure?

If you cant fix it with a hammer, its probably electrical.
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post #8 of 16 (permalink) Old Jun 13th, 2019, 5:41 am
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Quote:
Originally Posted by Thecrocodile View Post
I did, but I just ordered 5 feet of super submersive, extreme high pressure hose line. The only other option would be to buy nylon braided metal hose, but I feel that would be very overboard. I'm just trying to figure out if there is a reason why the pressure was too much. Could it be something my bike is doing? Fuel pressure regulator? Fuel filter? I'm at a loss.
OK. So it happens more than it probably should. Why? No idea. Knock on wood, it hasn't happened to me after 18 years and three FI Ducatis. In my case, I replace it with the recommended spec SAE 30R10 5/16" hose. It's expensive, but you should use it. I don't know what "5 feet of super submersible, extreme high pressure hose line" is, but it doesn't sound like SAE 30R10 which tends to come in one foot lengths for a price that makes you want to risk using regular hose. People have used regular FI hose to good effect and it's dirt cheap, but did I mention I have not had this issue????

The other sometimes overlooked item is using proper FI hose clamps. They apply pressure evenly around the entire circumference of the hose and do not damage the outer layer of rubber. If you have standard worm-gear type hose clamps, ditch them today.

I tend to store mu bikes with a full tank. Maybe that helps as well?

https://www.amazon.com/gp/product/B0...caticonvert-20

https://www.amazon.com/Breeze-FI5PB-...BHVF97AYT41YQC
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post #9 of 16 (permalink) Old Jun 13th, 2019, 6:09 am
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Yikes a mighty ... $30 bucks per foot. Well, it really doesn't matter how much more costly it is than the ~wrong~ hose ... it's the correct part for the application. It costs what it costs. It's no place to pinch pennies.

Movin' on:

Those hose clamps are the correct part for the application (as you've pointed out). Aside from the even clamping pressure those clamps also have radiused edges, which help to prevent the clamp's edges from cutting into the $30 bucks per foot fuel lines.

Thanks for digging that up Member *SS904 .... <img src="https://www.ducati.ms/forums/images/Ducati_ms_2015/smilies/tango_face_smile.png" border="0" alt="" title="Smile" class="inlineimg" />

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Last edited by Chuckracer; Jun 13th, 2019 at 7:56 am.
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post #10 of 16 (permalink) Old Jun 14th, 2019, 7:47 pm Thread Starter
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Yup. So I bought the exact Ducati part from a dealership. The hose cost me $38 + tax. I also bought a new fuel filter just to check that off the list too; we will see what happens. I guess I can look it up, but how would you check the pressure inside the tank?
Cheers.
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