Scootertrash
New member
Machine is a 200 SRX700
I will try to do the cliffs notes version to make this easy:
Got the machine as a pull and clean the carbs deal. Machine would n't run when I got it. Old gas in tank, whatever.
Pulled the carbs and cleaned them. Installed new needles and seat, the old ones were shot. Drained the tank and put in fresh fuel.
Installed the carbs and fired up the machine. Once the bowls filled up with gas it ran great. Until the 2 outside carbs started overflowing out of the vent lines. Middle carb did not overflow.
Rechecked the float heights and function of the floats. Everything was fine.
Reinstalled carbs and ran the machine. Same problem.
Took float out of middle carb and swapped it out with the two outside carbs. Still same problem. Both outside carbs overflowed.
Swapped needle and seat as above. Same problem.
Swapped out with and extra set of carbs. Same problem.
So this morning I went out and put a piece of fuel line on the carbs one at a time and blew as hard as I could (as in close to making my self dizzy), because I did not want to use and airhose from a compressor. I could not blow thru any one of the carbs. I figured this would tell me if the needle and seat were working. It appears that they are.
My questions are these:
Is it possible that the fuel pump could over pressurize just the 2 outside carbs (1&3), causing them to overflow?
What should i check to verify if the pump is over pressuring? I cannot find a pressure spec in the manual, just a check with a mightyvac.
Is there a rebuild kit for this pump?
Thanks for the help guys!
Scooter
I will try to do the cliffs notes version to make this easy:
Got the machine as a pull and clean the carbs deal. Machine would n't run when I got it. Old gas in tank, whatever.
Pulled the carbs and cleaned them. Installed new needles and seat, the old ones were shot. Drained the tank and put in fresh fuel.
Installed the carbs and fired up the machine. Once the bowls filled up with gas it ran great. Until the 2 outside carbs started overflowing out of the vent lines. Middle carb did not overflow.
Rechecked the float heights and function of the floats. Everything was fine.
Reinstalled carbs and ran the machine. Same problem.
Took float out of middle carb and swapped it out with the two outside carbs. Still same problem. Both outside carbs overflowed.
Swapped needle and seat as above. Same problem.
Swapped out with and extra set of carbs. Same problem.
So this morning I went out and put a piece of fuel line on the carbs one at a time and blew as hard as I could (as in close to making my self dizzy), because I did not want to use and airhose from a compressor. I could not blow thru any one of the carbs. I figured this would tell me if the needle and seat were working. It appears that they are.
My questions are these:
Is it possible that the fuel pump could over pressurize just the 2 outside carbs (1&3), causing them to overflow?
What should i check to verify if the pump is over pressuring? I cannot find a pressure spec in the manual, just a check with a mightyvac.
Is there a rebuild kit for this pump?
Thanks for the help guys!
Scooter
Last edited:
PZ 1
Member
- Joined
- Mar 12, 2005
- Messages
- 987
No I do not believe the fuel pump could do that. I cannot picture what is happening there without having a carb to look at. Apparently has some kind of an internal leak of air or fuel caused by something other than a flooding float bowl. If the float bowl was over filling and fuel was pushed out ot the vents, the carb should be flooding badly into the bore. Is it doing that? If it was flooding into the float bowl, you should be able to blow air through the hose.
My 97 started to push fuel out of the pump, not the carbs. It was the base gasket preasurising the system. i foud out the hard way and burned it down. Not saying this is your problem but just a thought. Maxdlx
Scootertrash
New member
PZ 1 said:
I don't think it's possible for the pump to over-pressurize either, but I figured it couldn't hurt to ask to see if someone has had this problem before.
I also went back out and switched the fuel line from the non-flooding #2 carb to the #1 carb which had been flooding and it still flooded, so I am ruling out the pump. (for now at least)
Yes, the bores are being flooded with fuel, enough so that there is fuel dripping out of the power valve connections and onto the pipes, but not a huge amount, just enough to stain the pipes. Although it doesn't appear that the crankcase is filling with fuel. In my mnd this tells me that the needle and seat are working and the fuel is not being gravity fed into the bores, if that is possible with this style of fuel pump.
The amount of fuel coming out of the vent lines seems to increase as I increase the RPM of the motor.
The machine sat for at least a year before he brought it to me. Is it possible that the power valves on the 2 cylinders are stuck and could be causing this problem? If the power valves were stuck could it cause pressure to come back thru the carbs and force air into the bowl and cause this? I mean, if the pistons create enough vacuum to suck the fuel out of the bowl could the reverse happen if the power valves were stuck and force enough pressure into the bowl to cause it to overflow? I am not getting any backfiring thru the carbs and I have been test running the sled without the airbox (just on a stand).
Just a note: I have disconnected the vent/overflow lines from carb 1 & 3 that connect to carb 2 (center carb) to confirm the problem is with carbs 1 & 3.
maxdlx: Thanks for the suggestion, I will keep this in mind as I troubleshhoot this issue.
Scootertrash
New member
Just thought I'd add that the overflow issue only happens when the machine is running, not when it is shut off.