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Old 11-25-2011, 08:49 AM   #1
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Not starting after sitting?

Hey guys i did a search and didnt find much results. I just picked up a 99 ZR 700. After sitting a day+ its like the fuel system loses prime and it wont start unless i pull it a hundred times or starting fluid. What should i look into? Fuel lines look good. I read somewhere fuel pump? Thanks for any advise you can give me!
-C
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Old 11-25-2011, 09:16 AM   #2
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Isn't there a directional check valve in the fuel system? For some reason I feel like I remember seeing one, maybe its missing!

As far as pulling 1,000 times... you could always blow into the fuel tank using you mouth and hand as a buffer between you and the gas tank, works everytime and I don't spend all that time and energy getting it to fire
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Old 11-25-2011, 09:21 AM   #3
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I would guess the diaphrams in the fuel are are bad or your pulse line going to the pump is bad. If the pulse line is bad it can.t pump decent at low rpms and if the diaphram is bad or has crud in the flapper it won't hold fuel to the carb and could be siphoning back.
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Old 11-25-2011, 10:02 AM   #4
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once it running it fine. its just getting there lol i will look into the valve. can i order a rebuild kit or get a new pump?
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Old 11-25-2011, 10:24 AM   #5
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you can get a rebuild kit. I would put a new pulse line on first though.
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Old 11-25-2011, 11:11 AM   #6
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The float needle and seat are in the top of the bowl. While it is possible to siphon the fuel out of the lines, it is impossible to siphon the fuel out of the carb bowls through the needle and seat. I would check your bowl drains to see if they are letting the fuel leak out of the float bowls requiring you to have to fill the float bowls every time you start it after sitting. If the carb bowls are full when you shut it off like they should be, and they stay that way, the sled should start just fine.
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Old 11-25-2011, 11:15 AM   #7
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Good point John!

With that being said does it smell of gas or do you have a puddle of fuel on the belly pan? That would be a dead give away!!!
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Old 11-25-2011, 11:44 AM   #8
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I'm with the "replace impulse line first" camp. Been there, done that. It is so simple and cheap to do this and a poor connection at either end can cause the problem described. Just get some automotive fuel line, of the appropriate diam., and cut to length.
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Old 11-25-2011, 05:11 PM   #9
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i will check the carbs. also what is the impulse line? Also noticed today i have a fuel filter between tank and pump and also between pump and carbs. To many? Should i take one out? Thanks for all the help guys!
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Old 11-26-2011, 08:28 AM   #10
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You only need one fuel filter, although having 2 shouldn't cause any problem. The one filter is usually installed between the tank and the fuel pump.
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