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post #1 of 14 (permalink) Old 10-20-2010, 10:21 AM Thread Starter
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Fuel Line question

Hi folks,

I'm new to the forum and am actually trying to help a buddy with his VN750. When looking at the petcock straight on - which fuel line leads to the "front" carb?

I'm assuming that the vacuum line and right (rearward) line go to the front carb and the left line goes across to the rear carb.

We suspect a the left/front carb is sticky. I drained the front carb last night and tried to introduce some sea-foam via the fuel line but am second guessing myself. FYI, I used a syringe and a length of tubing (3/16ths maybe?)that slid inside the fuel line to deliver the seafoam with very little spillage.

Thanks in advance
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post #2 of 14 (permalink) Old 10-20-2010, 04:29 PM
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what pet cock you have? run-off-prime, or run-off-res?
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post #3 of 14 (permalink) Old 10-20-2010, 05:59 PM
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Does it really matter which is which? Think I've had them both ways.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
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post #4 of 14 (permalink) Old 10-20-2010, 07:57 PM
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well, if its a petcock with "Prime, then there won't be a vacuum line... and as long as the "reserve" style petcock is getting vacuum to the vacuum port, then it doesn't matter which line goes where.
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post #5 of 14 (permalink) Old 10-21-2010, 09:26 AM Thread Starter
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Thanks for the reply;

The carb drain and flush has seemed to do the trick. After blowing out the residue the bike was idling and running very nicely.
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post #6 of 14 (permalink) Old 10-21-2010, 11:20 AM
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Check the tank for rust.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #7 of 14 (permalink) Old 10-21-2010, 12:17 PM
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Use seafoam often. About every 3rd fill up is about what I do. Keeps everything squeaky clean and haven't had a problem yet.
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post #8 of 14 (permalink) Old 10-21-2010, 03:35 PM
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Quote:
Originally Posted by slimvulcanrider View Post
well, if its a petcock with "Prime, then there won't be a vacuum line... and as long as the "reserve" style petcock is getting vacuum to the vacuum port, then it doesn't matter which line goes where.
slim are you sure about this?

This is the first time that I have heard that early "PRIME" petcocks don`t have a vacuum line. I haven`t researched it, but I had assumed there was a gravity feed provision for the PRIME position only, and the RUN and RESERVE positions were vacuum operated as are the later models.

Gordon

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Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #9 of 14 (permalink) Old 10-21-2010, 05:23 PM Thread Starter
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Quote:
Originally Posted by VN750_DawgsFan View Post
Use seafoam often. About every 3rd fill up is about what I do. Keeps everything squeaky clean and haven't had a problem yet.
Roger that, I'm a believer in the Seafoam. I add a couple ounces to my tank every month ('04 Ducati 999S).

My buddy's Vulcan went through about a can and a half together with the treatment I mentioned above. After a few impressive smoke shows its running better than ever -

The reason I asked about the lines is that I only injected the Seafoam into one line, believing it fed the front carb which we identified as the cuplrit. I just wasn't sure but it doesn't matter now.

I am sure his tank is full of rust, the gas from the carbs looked like orange gatorade with a couple of varnish slicks floating in it. I just got him a newer petcock (found one cheaper than the rebuild kit) and will treat the tank soon. Last time I did a tank I used some stuff (acid, neutralizer and coat) from a Harley shop, I can't remember what it was called but man it went on nice.
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post #10 of 14 (permalink) Old 10-21-2010, 07:52 PM
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Quote:
Originally Posted by OlHossCanada View Post
slim are you sure about this?

This is the first time that I have heard that early "PRIME" petcocks don`t have a vacuum line. I haven`t researched it, but I had assumed there was a gravity feed provision for the PRIME position only, and the RUN and RESERVE positions were vacuum operated as are the later models.
Not 100% sure, but on my CX it has run-off-prime... no vacuum port, so I was assuming that most petcocks that are listed as prime are gravity fed only. My assumption could be wrong though
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