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'86 Honda Fourtrax 350 4x4 Fuel system question

5846 Views 5 Replies 3 Participants Last post by  retro, 
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New member here, first post. I found the forum searching for my problem, but didn't exactly find the issue I'm having. I have two '86 Honda 350 4x4's that are in great shape. I just rebuilt the carburetor on one of them and it runs great. Problem is that now when it is running, gas is coming out of the vent line from the lower back side of the fuel pump, and squirting out where it ends up in the headlight. The line has a tee in it and it also extends back to the rear brake drum. A side question is, why does the brake drum need a vent? I can pull the line off at the brake drum and the gas then runs out there instead of squirting out in the headlight. I wonder why the gas isn't running out in the brake drum with the line connected? Clogged maybe? Could anything with the carburetor rebuild have anything to do with this problem? Seems like a fuel pump issue and I really don't see how it could be caused by the carburetor rebuild, but it is a strange coincidence if it has nothing to do with the carburetor. Any help would be greatly appreciated.

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I used an aftermarket kit, as no OEM kits are available. Don't remember the brand. New fuel filter, drained and flushed the tank. The vent from the fuel pump isn't connected to the vent and overflow lines from the carburetor in any way. The vent line that is squirting fuel runs from the rear brake drum up to the fuel pump, has a tee that attaches to the fuel pump, and then extends up into the headlight. The vent lines on the carb extend up the other side of the machine into the headlight and down out the bottom of the machine to drain an overflowing bowl. Duhhh, haven't thought of swapping out the pumps. I'll try to get some pictures up soon. We have 2 of the 350's and a '86 250. We bought all of them second hand in the early '90s and they were practically new. Me and my dad like the older machines, before they started making them so big.
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They are tee'd together on both of my '86 machines, which have had very little work done on them. On page 14 of the manuals, it looks like they were tee'd together in '86 and a separate brake breather tube added after '86. Doesn't really matter I suppose. Do you know of a good source for OEM fuel pumps?
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