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Old 09-20-2015, 04:49 PM   #1
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Angry Fuel Leak

Pertinent info: 2007 VStrom 1k with 36k on the clock. Bike hadn't been run in about a month. Leak only happens with engine running. No leaks with key on and fuel pump primed. 43psi FI system.

On Monday, 9/14, I was getting ready for a ride and noticed a puddle of fuel on the ground while letting the bike warm up. Fuel was dripping from the left side of the engine at about a drop per second. Shut it off, rolled it back in the garage and took my other bike. Finally got around to searching for the leak today. Started it up, and the leak was still there. Stripped the fairings, loosened the tank and started the bike again so the leak would leave fresh gas at the point of origin...and no f@cking leak. I'm guessing the offending component (hose or O-ring) dried and shrunk while sitting, then rehydrated after the bike was started. Just don't know why it leaked today then stopped after being run less than a week ago.

Fuel leaks on my bike aren't unheard of and when they do happen, the symptoms are identical to mine, but it's usually the 1 3/8" jumper hose between the fuel rails. After dissection, I can't see a single sign of a leak around that hose. I do, however, see signs of a leak around the front injector. Does anyone see something I missed? If not, is there a source for suitable O-rings so I can replace them? I'd hate to drop the money on new injectors just to fix a faulty O-ring.

Note the dual-colored front injector and the apparent dampness on the front fuel rail bracket. I think the discoloration on the rear bracket is due to a leak from the airbox boot. The usual culprit for a leak is the short rubber hose between the two circles. Top of frame: clutch side.

IMG 1816 zpsyrvr1cic

Impossible to get a decent pic of, but straight down in this area seems to be where the leaking gas is going (also the side and general location where the fuel drips). Front TB on right. Top of frame: clutch side.

IMG 1818 zpsoyivjggj

More apparent dampness on front injector. Top of frame: throttle side.

IMG 1819 zpsf8fpstqu

Apparent dampness on vent line directly under front injector. Top of frame: clutch side.

IMG 1817 zpstbs6o3wb

Rear injector.

IMG 1822 zps6mxor9fv
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Old 09-20-2015, 04:53 PM   #2
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If your tank is designed anything like my TLS, I would look at the fuel pump...I know the engine is similar. ...
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Old 09-20-2015, 05:07 PM   #3
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If your tank is designed anything like my TLS, I would look at the fuel pump...I know the engine is similar. ...
Just ran out and put my tank on saw horses to check. No sign of a leak. Fuel pump sits on top of my rear cylinder. Any fuel leaking from there would run off the back of the motor.
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Old 09-20-2015, 05:41 PM   #4
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I had a really good guess, then google proved me wrong...

Here is an easy way to find out. Prop the tank up. Jump the main/fuel pump relay and just let it run until you find the leak. Yours is a return-less system there shouldn't be anything to worry about as far as over-pressurization during the test.

LMK, I'm right down the street if you need anything!
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Old 09-20-2015, 06:17 PM   #5
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Quote:
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I had a really good guess, then google proved me wrong...

Here is an easy way to find out. Prop the tank up. Jump the main/fuel pump relay and just let it run until you find the leak. Yours is a return-less system there shouldn't be anything to worry about as far as over-pressurization during the test.

LMK, I'm right down the street if you need anything!
Thank you. I'll try that. Will this generate enough pressure to make it leak if the origin is on the discharge side of the injector?
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Old 09-20-2015, 06:39 PM   #6
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Too late to edit. Stupid question. Forget I asked that.
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Old 09-21-2015, 07:43 AM   #7
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Too late to edit. Stupid question. Forget I asked that.
just do TLR throttle body swap. bigger bore, dual injectors, no secondaries
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Old 09-21-2015, 09:04 AM   #8
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I've used A/C orings on my auto fuel injectors with good results. I got real good at changing them after three out of the four fuel injectors I bought online were defective.
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Old 09-22-2015, 02:28 PM   #9
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My 150cc roketa bermuda wont ststay charged
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Old 09-29-2015, 05:11 PM   #10
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any developments?
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Old 10-01-2015, 09:03 PM   #11
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any developments?
Yes. Was on my way to post up. Finally got around to tinkering with it today. It was the cushion for the front injector. Lots of grit and grime, and when I yanked it there was a ring of crud in the recess. Cleaned everything up and slapped on a few dabs of grease. No leaks! I just threw the tank on to start it. Gotta put the thing back together when I get a chance. Getting the airbox back on will take longer than the fairings.
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