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Post by rich on Sept 29, 2015 16:01:19 GMT -5
Low rpm low pressure no fuel flow thru petcock. Get her started, rpms increase which increases vacuum, opening the failing petcock more. A properly functioning petcock will allow fuel to flow at low rpm low pressure. I see. I actually ordered a new petcock for 8$ just to see if I could get an answer for 8$... No luck. In fact I couldn't even get the scooter to start at all with the new one! The old one at least let me get her started after cranking for about 5 minutes. So...now it's on to opening her up and doing the valve thing today. If that's not it then I'll move onto something else... Round and round we go! |
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Post by rich on Sept 27, 2015 18:42:09 GMT -5
bump
Sept 24, 2015 15:33:49 GMT -4 rich said:
Cool. I do have a question that I don't think I've been able to find the answer to through all of my searching this forum.
Let's say that the vacuum petcock is the big issue here and that they are causing these fuel delivery problems... "What then, is the explanation for the fact that they can cause the carb to not initially get fuel but then work fine as long as you can finally get the scooter cranked?" Thats the part I'm not getting...
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Post by rich on Sept 24, 2015 14:33:49 GMT -5
Cool. I do have a question that I don't think I've been able to find the answer to through all of my searching this forum. Let's say that the vacuum petcock is the big issue here and that they are causing these fuel delivery problems... "What then, is the explanation for the fact that they can cause the carb to not initially get fuel but then work fine as long as you can finally get the scooter cranked?" Thats the part I'm not getting... |
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Post by rich on Sept 23, 2015 20:10:04 GMT -5
Take ANY wire that is "hot" when the ignition is turned on (and NOT hot wne the key is off) and connect it to a relay. The other side of the relay coil to ground. Run a wire from battery to the terminal side of the relay and the other spade of the terminal side to the pump. Then the pump is "on" when the key is on, off otherwise, with all pump current coming from the battery. Plug that vacuum port and ride happily. ps: I ended up also getting a cheap pressure regulator to make sure the pressure was only 2 psi into the carb. Thye needle valves in these things are cheap little things, not that good at a high pressure. Ok. So ordering something like this: fuel pump look fine? and which psi reg do you suggest? |
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Post by rich on Sept 22, 2015 20:04:35 GMT -5
Take ANY wire that is "hot" when the ignition is turned on (and NOT hot wne the key is off) and connect it to a relay. The other side of the relay coil to ground. Run a wire from battery to the terminal side of the relay and the other spade of the terminal side to the pump. Then the pump is "on" when the key is on, off otherwise, with all pump current coming from the battery. Plug that vacuum port and ride happily. ps: I ended up also getting a cheap pressure regulator to make sure the pressure was only 2 psi into the carb. Thye needle valves in these things are cheap little things, not that good at a high pressure. Great. Thank you. This scooter is in pretty decent shape and I've had fun getting her running down the road. Now if I can just get her going faster than 35mph  ha |
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Post by rich on Sept 22, 2015 19:39:10 GMT -5
Ran my scooter completely dry of gas last week (at night, of course). Luckily it was only 3/4 mile to the gas station, so I just pushed it there and filled the (under floor) tank (identical to yours, HB-Bob). Now, with the OEM, vacuum operated fuel pump I would have been cranking the starter for several minutes to get the fuel up to the carburetor. Remember the very first time your tried to fire up your brand new scooter? But luckily for me I pulled the absurd vacuum driven kludge out and have a nice little electric pump. Turned the key on. Click click click click click click click hummmm hummm hummm and I knew the bowl was now full of gas. Hit the starter switch and "Vrooooommmmm" instantly. No discharged battery, no sweat wondering if it would catch before the battery died, no embarrassment sitting at the gas station running the starter over ... and over ... and over .... Best Twenty Bucks I have ever spent ! www.ebay.com/itm/Auto-Metal-Electric-Fuel-Pump-Solid-Fuel-filter-2-4PSI-20-30-GPH-/161512976244?vxp=mtrSO...I've got a similar thread somewhere on here and finally got the thing running, but running doesn't mean she starts when I want her to. This solution sounds wonderful and practical. No draining the battery trying to prime the system, etc. I have two questions. What wire should I tap for electricity to the pump and what should I do with the left over vacuum hose, just plug it? Thanks in advance |
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Post by rich on Jun 22, 2015 14:33:40 GMT -5
Now just to get it running faster than 30mph haha seems sluggish.
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Post by rich on Jun 22, 2015 14:33:06 GMT -5
Does it have the tank in back above the carb or in the floor, if up high probably the vac operated fuel petcock, if below electric fuel pump may be bad. Also just looked at the photos, with that hole in the vac lines if vac fuel petcock then it is not getting enough vacuum to pull fuel from the tank. GOT IT RUNNING! Replaced all lines, shot some carb cleaner into intake to prime it, cranked right up! Thanks for all the input! |
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Post by rich on Jun 20, 2015 22:56:40 GMT -5
Bump
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Post by rich on Jun 15, 2015 16:48:47 GMT -5
Ok, So spark plug seems to be ok. Starter seems good, getting it to turn over quite well. The issue seems to be that its not pulling gas from the tank at all... Most of the fuel lines look to be in bad shape, so I will start there first. But I can tell it really just isn't getting gas to the carb. I took the air filter off and sprayed carb cleaner down into intake and she cranks right up for a short moment. Is there a device that is supposed to pull gas from the tank somewhere in the line? Possibly the metal box with the gas line going to it and coming back out to carb area? Pictured here:  Other things that have me guessing are the condition of this device connected to side of carb. Pictured here:  I noticed the two wire leads going to it had been melted together at some point and it appeared as if it had been removed and put back a few times. Note the plastic rings all mangled up. Other than those noticeable issues there is a wire/plug coming out of main harness that apparently, has nothing to connect to...is that normal?...pictured here:  |
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Post by rich on Apr 13, 2015 19:52:02 GMT -5
Its turning over just fine and sounds fine attempting to start as well. No grinding or any other abnormal sounds. I will post back once I test the spark plug, fuel delivery and change the deteriorated fuel lines. Thanks for the reply and sorry for the lack of diagnosis information! I know to check all of those things you listed, just didn't include that info in my initial post. My apologies. I will post back soon.
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Post by rich on Apr 13, 2015 18:28:29 GMT -5
So I bought my brother's scooter. It was brand new 3 years ago, and still pretty much is. One day it died on him pulling into the driveway, and he couldn't get it to start. Im thinking easy enough, gotta be dirty gas, carb, fuel delivery, something right? Here's what confuses me. My brother took it to a mechanic and says the mechanic stuck a butane torch down the intake and got it to crank right up... What's the deal?
I plan on taking the carb off, cleaning its ports, replacing fuel lines and going from there. Sound about right?
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