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Post by alleyoop on Sept 24, 2014 18:13:50 GMT -5
Look at the picture I put up see that HOSE on the bottom looks like it goes to the tank on the bottom is that the same hose that the Fuel Filter is attached to.
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Post by dcustriker on Sept 24, 2014 18:34:02 GMT -5
The hose on the bottom right of the pic is going to the fuel pump. You'll follow the hose from the bottom right at the fuel pump, then it goes to the filter, then to the tank. That's the fuel pump on the bottom right.
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Post by alleyoop on Sept 24, 2014 19:23:12 GMT -5
Well if the FUEL OUTLET is on the bottom of the FUEL TANK then I can see why no fuel is in the fuel filter and the lines. If you can take some pictures beyond the Fuel Filter that might help some. Alleyoop  LOOK at the hoses in this picture the hose I labeled FOLLOW THIS HOSE is one of the other hoses I labeled a continuation of that hose? |
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Post by alleyoop on Sept 24, 2014 19:30:28 GMT -5
Let me ask ONE simple question IS THERE a hose on the bottom of the FUEL TANK if so where does that hose go to.
Reason I am asking is the hose going to the fuel filter from the tank is the TANK VENT and not the Fuel Outlet for the tank. In which case the Actual Fuel Outlet for the tank is Probably connected to a Canister which is for the Tank Vent. This situation would not draw fuel at all to the carb or fuel filter, and that is why the fuel hoses are dry. And the hoses would need to be switched.
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Post by dcustriker on Sept 24, 2014 22:45:46 GMT -5
 Here is where both the fuel line and vent line connect. The fuel line is the one on the right (closest to the camera). I removed the hose from inlet of the fuel pump and sucked in from the tank. Fuel came out. Looks like there is suction problem. So I'm probably going to go ahead and just change out all the vacuum hoses, and replace the fuel pump. |
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Post by alleyoop on Sept 24, 2014 23:10:43 GMT -5
Ok, so the tank fuel outlet is on the bottom of the tank. This is what I would do mount the the fuel pump little lower than the FUEL TANK OUTLET so that fuel flows to the pump. Don't worry about it pumping up to the carb if the pump is working it will pump fuel to the carb. Right now Fuel from the Tank is NOT reaching the pump due to the hose going up to the fuel filter then to the pump. Here is my Fuel Pump and my tank is way up front under the handle bars and pump is about 1 /12 feet from the tank on the bottom rail. Then the pump has to pump gas 3 feet and UP 1 foot to my carb that is 4 feet it has to pump the gas . So move the pump little lower than the outlet and make the hose a straight little downhill to the pump even if you have to make the hose from the tank to the pump shorter does not matter so the pump always has gas to pump out to the carb. Alleyoop My Fuel Pump way up front on the bottom frame rail:  Fuel line from pump going up to my fuel filter to the carb above another foot from the fuel filter:  |
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Post by alleyoop on Sept 24, 2014 23:14:11 GMT -5
 That is your problem gas cannot get to the pump. Alleyoop |
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Post by dcustriker on Sept 24, 2014 23:34:35 GMT -5
I think I see what your saying. So I'm not removing the hose from the top of the gas tank and connecting it to an outlet on the bottom right? Because I looked at the bottom of the tank and didn't see any kind of outlet there. Basically what I'm doing in getting it to where all the fuel needs is the suctioned out of the tank, then let gravity pull fuel down towards the pump which will send it to the carb. Am I getting the right idea?
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Post by alleyoop on Sept 24, 2014 23:44:47 GMT -5
You want the gas to gravity feed to the pump then the pump will have gas to pump to the carb. Right now the filter does not even have gas.
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Post by Deleted on Dec 11, 2014 22:36:38 GMT -5
Hello. I have a 2010 taotao 150cc , cy150 as well. I happen to have the same problem. Im curious if someone could provide an update ? Was there ever a solution?
How my problem started:
I bought scooter and rode it about 100 miles turning it on and off maybe 2-3 times...next day i start it up and let it warm up but after about 2 minutes of idling with no throttle at all, the scooter seemed to hesitate and slightly stutter or flutter, the scooter shut off and it became a crank no start situation. Just the previous day the scooter ran great, started up without throttle, rode well.
I looked at gas gauge and saw i was very low, did not think i was empty, but just very very low..so i got a gallon of gas and filled tank, scooter would still not start. This started me into a loop of troubleshooting which led me to replacing battery (broke terminals they were so corroded i wasnt careful), replaced spark plug. I found that i had spark so it was a fuel issue.
I pulled fuel hose before it went to the filter before the carb and fuel would not spill out so i figured fuel wasnt gettig to carb. Tried cranking with gas cap open, nothing.
Then i primed the system using a bleeder tool. I disconnected hose at different places to get fuel up to that point to see if i could spot the problem..it only worked when i connected the fuel hose that connected right to the carb. I made sure i held the line a certain way so i knew i had fuel up to the carb, and then connected hose. Started it, nothing. I closed the gas cap and tightened, and it started up. It ran perfect through its warm up proccess, and after 2 minutes (when i think the auto-choke closes since its warm) the scooter died again and was back to square one.. Crank no start, fuel not getting carb. Kinda seeems like it isnt getting out of fuel pump on its own either...
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Post by Deleted on Dec 11, 2014 22:56:20 GMT -5
The design of the system seems tough as ducrider mentioned. The fuel tank is lower than the engine. The fuel tank outlet hose is connected to the TOP of the fuel tank, and sits SIDE BY SIDE to a vent hose that dangles. I wonder what would happen if i closed gap cap and blew into vent house and tried crank starting...lol
It seems like the system is having trouble getting fuel to the carb. I know im getting vaccuum because all my lines look good and you can feel it sucking from the vac line where it connects to fuel pump. We then connected vac line to fuel pump and disconnected both fuel pump inlet and outlet hose and cranked it and it felt like the pulses of the engine cranking was pushing/pulling air out of the nipples (wasnt too strong however) so i wonder if its a fuel pump thats not working 100% and thats why it'll run at higher idle and with throttle but not when it leans the mixture (once engines warm) and shuts off im guessing because it loses vac and suction power. Im kindve lost its been a nightmare the scooters in a thousand pieces
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Post by rcq92130 on Dec 12, 2014 2:05:45 GMT -5
Seems to me the fuel outlet from the tank is on the bottom of the tank, where it should be.
Guessing Alley is right --- there is an "air lock", if you will, between the tank outlet and the filter or pump.
Shoot, guys. Just install an electric pump and be done with all these headaches!
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Post by hillbillybob on Dec 12, 2014 19:35:52 GMT -5
There is really nothing wrong with these systems, where the pump is higher than the tank...... if you have a good vacuum source, good hoses, tight connections, and unrestricted fuel lines.
My scoot is one of those with the tank under your feet, pump up high on the frame, and has worked just fine so far (5,800 miles...3 years old next March) My 10 year old Cub Cadet Mower has the same kinda fuel system, vac operated, tank lower than pump and carb, a fuel filter and almost 5' of hose between the pump and tank......have never had a single problem with it.......engine hour meter reads 1,006 hrs....that's equal to 25,000 miles or more of scooting. So as I said before, I see nothing wrong with this design.....if yours isn't working, you have a faulty component, or bad connection somewhere.
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Post by rcq92130 on Dec 12, 2014 20:02:14 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=mtr |
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Post by geh3333 on Dec 12, 2014 21:00:49 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=mtrThank god for gravity . no fuel pump of any kind on my scoot , not even a vacuum operated fuel valve . nice 1/4 inch fuel line ran from my tank to a filter to a Manual shutoff and straight to the carb. |
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..BAD TO THE BONE..
