Fuel filters not filling... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 15 (permalink) Old 08-16-2007, 02:38 PM Thread Starter
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Angry Fuel filters not filling...

This might be related to my previous post below about the leaking petcock but I think it might be a totally different problem. Basically, I've removed the petcock diaphram so that fuel flows freely down the lines. No more vacuum hose. I sealed it with a makeshift gasket so NO MORE LEAK either. I installed a clear plastic filter on each line right out of the petcock. Here's the problem... the rear-most fuel filter fills up nicely while the front-most stays almost empty. Now, if I tip the tank forward then the front filter fills up all the way but the rear one empty's out. When I take her for a ride she'll last the 3 minutes perfectly and then starve. I'm assuming she's living off the float bowls but not replenishing. When I watch the filters closely, you can clearly see the fuel easily flowing into the full filter but not the empty one. When I tip the tank it's vice versa. My question is, by installing the filters does this mean that the suction from the carbs that was once enough to draw gas is now too small? Do I need to somehow increase the 'pull' power from the carbs? And why aren't the lines drawing fuel equally from both sides of the petcock... only from the side which is tipped? I'm pretty sure there's no blockage in the petcock since I can easily blow air through one and out the other and, like I said, when I disconnect both lines fuel flows quickly from both. BTW, here's a quick little test I did. I waited for the bike to start starving and watched as the one filter emptied. I shut her off and waited to see if any fuel flowed into the empty filter. Nothing. But as soon as I disconnected the filter from the petcock a gush of fuel came out. Any ideas would be most helpful!
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post #2 of 15 (permalink) Old 08-16-2007, 03:49 PM
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Have you tried to swap the filter to see if there is a problem with the rear filter. You may have done this already.

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post #3 of 15 (permalink) Old 08-16-2007, 04:09 PM Thread Starter
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Yes I did. As soon as I swap them and start the bike, the one that was full starts emptying and the empty one starts to fill. With about 30 seconds they look exactly like before the swap.
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post #4 of 15 (permalink) Old 08-16-2007, 06:33 PM
 
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Is one filter higher then the other?
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post #5 of 15 (permalink) Old 08-16-2007, 08:42 PM
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Curious, although the only thing I can think of that can affect carb pull is that they might be out of sync. However, the tipping of the tank makes me lean in Piro's direction. Were the carbs sync'd before you put the filters on?

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post #6 of 15 (permalink) Old 08-16-2007, 09:11 PM
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Try opening the fuel cap while bike engine is running. Also tap the carb with a wrench and see if the fuel flows better.

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post #7 of 15 (permalink) Old 08-16-2007, 11:29 PM Thread Starter
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The filters look the same height although the petcock tilts slightly downwards towards the back of the bike because of how these gas tanks are. The bike ran PERFECTLY up until I decided to pull the tank to clean it. It was all rusted (REALLY BAD... I'm talkin thick rust all over, no clean metal). I ride 20 miles to work and back and never had a problem. I just figured it was only a matter of time before the rusty tank caused trouble. I tried to clean it but still looks like crap inside. Because of this I installed the filters. I also took apart the petcock and cleaned it (that's probably when I damaged the diaphram and had to toss it). I didn't even touch the carbs though, so I don't think they could have gotten out of sync. I tried the fuel cap but no go. The only way to get even flow is to lift the tank about 4 inches in the back so the petcock is parallel to the ground. But obviously I can't ride like that. I'll try the tappin'.
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post #8 of 15 (permalink) Old 08-16-2007, 11:51 PM Thread Starter
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A pic of the filters

Here's a pic...
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post #9 of 15 (permalink) Old 08-17-2007, 04:57 AM
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There was mention of being sure to use hi-flow filters when adding them to a normally functioning fuel system, not sure if that'd be an issue with a modded petcock like yours though?
Have ya tried switching the line itself (after the filters) from the front to the rear, and rear to front? Don't know what that'd prove, but couldn't hurt to try.


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post #10 of 15 (permalink) Old 08-17-2007, 10:50 AM Thread Starter
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Hmmm... That's a good point. I didn't think about high flow. That could be an issue. I'm almost tempted to remove the filters for just a quick test but I'm too afraid with the condition of that tank. I did notice last night that she performed a lot better, didn't completely starve when i took her out. Just a little more rough than normal. I'm wondering if the system just needs a good run just pumping gas through to get some gunk moving out. I'm definitely gonna try the seafoam and see what that does. Another thing I'm wondering is if the added length of the new hoses and filter has affected the carb sync. I'll check into that too. Just wanna say thanks for all the help I've been getting. First bike and all, it's good to know we have such a great community!!!
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