THe CV carb really needs the extra vacum to work right

 

<div class="FTQUOTE"><begin quote>Originally posted by: ftwflh

I beg to differ.All Polaris 4stroke use this pump it helps on constant fuel delivery.</end quote></div>

ftwflh - I'm not into trying for a whizzing contest, AND I know that you are knowledgeable with the Polaris quads ... My dad used to play around on this forum YEARS ago, and he remembers your "handle" and the knowledge you contributed.

Have you ever tried bypassing the fuel pump on one of these and know from first hand experience that the fuel pump is totally necessary?

I grew up in dad's ATV repair shop, and back in the early days of Polaris 4 stroke quads (1995 was the first year of the Polaris 4 stroke), the fuel pump kit was not available - you had to replace the whole fuel pump - - solution to a defective fuel pump? Replace it with a Briggs & Stratton pump for $15, 1/4 the price of a new pump from Polaris. Now a days, at $22, it is still less expensive than the cost of the diaphragm kit from Polaris.

Once upon a time, we were up in Arkansas on a family vacation, and mom's Magnum's fuel pump started acting up - since we did not have access to parts, dad bypassed the fuel pump to get us back to camp. The Magnum performed flawlessly without the fuel pump - no matter what kind of steep ups and downs the quad when through. He ended up leaving the fuel pump bypassed.

To this day, he will give the customer the option of Polaris fuel pump parts, a Briggs & Stratton fuel pump, or if the "flat bottom" tank - the option of bypassing the fuel pump. Numerous customers over the years have chosen the bypass method and have had no complaints.

 

I tried bypassing it on a 07 450 but couldnt get it to do more than idle.I really have never had a problem with the fuel pump.Most of the time it was valves out of adjustment or a plugged vent line.

 

The air in fuel line has to be coming from somewhere, it's got to be blowing by one of the diaphrams in fuel pump? Does that sound logical? Should I try bypassing fuel pump? If so what do I do with vacuum hose, plug or leave open?

 

eng. vibration wers out the brass nozzle down the middle of carb. replace it and the neddle will fix prob the fuel issue is not the prob.fixed dozen or so same prob if youre carb doesn,t hav a braket to the frame see if u can still get one polaris service bulltion in 1997 for1995/96 models

 

you can test a fuel pump unkook all of the hoses. take it off the atv. you will not be able to clow threw the line that is going to the crankcase or intake for suction. you will be able to blow or suck a lil and then stop it wont be a flow. if it is then its broken. you will be able to blow into were the fuel from teh fuel tank hooks up but not the other direction if you can blow the wrond direction it is broken. eather way all it needs is a rebuild kit. youu can put a mikuni fuel pump on there it is 12 dollars for a rebuild kit. i use this on my race car with the 270 cc honda dirt bike engine on methanol. it is teh best and everyone uses them.http://images.google.com/imgre...crosoft:en-US%26sa%3DN we block off teh one outlet on the car tho.

 

My '96 425 Magnum has the pump bypassed. It was like that when I got it. The only problem I have is running out of fuel at wide open throttle. It starts to sputter and backfire. I really need to get the kit for the pump. I tried to hook it up, but it didn't do anything.

 

yea it is preety esasy

 

in 15years 3 bad fuel pumps 1 screw fell out 2 water froze in pump 3 water froze in pump its not the pump thats on snowmobiles and atvs

 

i think any suction pump should work as long as it is big enogh