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Post by ridecheap on Apr 14, 2013 23:01:25 GMT -5
No sound  Well I have EFI so it use more pressure unsure of the PSI . If you want EFI check out www.ecotrons.com for kits The fuel pump on my efi puts out about 45psi. The pressure regulator regulates it down to about 36psi. Mine also draws about 2 amps Roy More write up on this: Same scooter as mine with fuel pump 4 PSI its a carb scooter:  Stock vacuum pump  Hoses side by side left is better:  The mr gasket PSI pressure gets up to 4 PSI Fuel Pressure set for 1.5psi. Which matches the OEM vacuum pump's best pressure at about 1800 RPM. Someone did a write up on this: I am somewhat surprised that no one has tested the fuel pressure on the OEM setups to see what they really have. My fuel pressure tests show the vacuum fuel pump behaving exactly as I had surmised earlier. So there are no surprises there. On a four cycle engine you don't really have good pressure pulses that a fuel pump can use like you do with a two cycle engine. Anyway on my engine, I measure about 1.25psi at idle and about 1.5psi at 1800 to 2000 rpm. From then on fuel pressure gets inexorably less and less as the engine speed increases and the load goes up. Cruising at 40 mph results in about 0.5psi or so of fuel pressure. 50 mph plus is about 0.25 psi to 0.5psi. Go up a hill and try to maintain speed and not slow down, and fuel pressure goes toward zero. When you cut throttle at speed and slow down, when engine vacuum is highest, the fuel pressure goes up to around 1 psi sometimes a little more of course. There is a side vacuum diaphram on the carb that limits the fuel in the carb and that probably keeps the manifold vacuum from going too high in this case. The vacuum fuel pump as seen on the lower right side, mounted to the frame. Read more: scootdawg.proboards.com/index.cgi?board=250ccengineandtrannsmission&action=display&thread=21611#ixzz2QV8orURi |
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Post by ridecheap on Apr 14, 2013 23:09:08 GMT -5
No sound Well I have EFI so it use more pressure unsure of the PSI . If you want EFI check out www.ecotrons.com for kits The fuel pump on my efi puts out about 45psi. The pressure regulator regulates it down to about 36psi. Mine also draws about 2 amps Roy 4 PSI is more then enough for this 257cc carb scooter maxing out really with the stock vacuum pump at under 2 PSI basically. Not sure what some of the fuel injected scooters are doing but they might gain from 45 PSI. |
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Post by spandi on Apr 14, 2013 23:15:06 GMT -5
Just one thing. Chinese fuel pumps (particularly on the 250's) have a rep for conking out. So it may not be the vacuum system as such. thats why one of the first this I did was pop in a Mikuni pump. Japanese made, and I took it up a steep mountain road (2600 feet in four miles) and had to BACK OFF the throttle as it just wanted to go faster. (I think my scoot is part Big Horn sheep)
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Post by bvance554 on Apr 14, 2013 23:31:02 GMT -5
I must be immune to ethanol related fuel problems. I read about everyone having problems but i've experienced zero. Boat, scooter, outdoor equipment... none have had any issies and start right up after storage. I don't take any special precautions other than some stabizer when stored. Am i just lucky? I think the problems with ethanol are way overblown, or its just easy to blame ethanol for problems that are totally unrelated to ethanol.
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Post by spandi on Apr 15, 2013 1:40:27 GMT -5
Seafoam
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Post by prodigit on Apr 15, 2013 8:46:16 GMT -5
Ethanol becomes less and less an issue.
Most imported chinese scoots:
1- Do not have fuel pumps
2- Have fuel hoses that can withstand E10 fuel (don't put E85 in there).
It's a legal requirement for any car/motorcycle/scooter to have, fuel hoses that can withstand E10 fuel.
I ride around on my stock fuel lines for 6 months now, and they feel just as good as day one.
No hairline cracks, no rupturing, no leaks, no breaks.
Neither do I have any problems with my fuel pump on any of my scoots; some of them are just over a year old!
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Post by bvance554 on Apr 15, 2013 12:10:44 GMT -5
I've never changed fuel lines either. Its been two years...
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Post by ridecheap on Apr 15, 2013 13:17:18 GMT -5
Yeah I use seafoam also but when you have gumming up of the carb and your fuel is eating away lines I would upgrade IMHO. I have no carb problems what so ever. |
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Post by jwalz1 on Apr 15, 2013 13:19:48 GMT -5
I have no problem with upgrading anything, but how will a fuel filter pull 10% of the ethanol in a gallon of gas out? Where does it go?
The ethanol is NOT a dissolved solid, it is a liquid that will pass right through the filter.
Ethanol can dissolve certain kinds of rubber not manufactured to be compatible with it, but the filter will do nothing to pull 10% of your fuel out. You just wasted $40 if removing ethanol was your goal.
Any gumming issues can be dealt with by using an additive, but a filter has no effect on ethanol.
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Post by ridecheap on Apr 15, 2013 13:29:24 GMT -5
These Chinese scooters and other scooters have the worst fuel filters out there. The ethanol eats them away so your getting full gumming of the carb and other objects into the engine. This mr gasket fuel filter is a micro fuel filter that goes directly into the electric fuel pump and its made for CARS so it can handle the ethanol additives and what not gumming up your engine. Seafoam costs about 20 bucks a bottle then you taking off your carb to deal with sticking of jets or damages of sticking due to the carb while riding long term sucks. You can keep pouring seafoam at 20 bucks a bottle in each month if you want.
The thing I got cost 40 bucks never had a carb problem in my life on this scooter. Call it lucky or call it a cheap upgrade.
Not to mention your getting better PSI control to the carb. The old vaccum system fuel pump peaks at under 2 PSI. This mr gasket does 4 PSI could also be helping out when you idled.
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Post by skuttadawg on Apr 15, 2013 13:31:26 GMT -5
My scooter dealer told me some TaoTaos have the filter on backwards out of the crate . China is smart enough to not waste moonshine by putting it in gas thus eats soft rubber in some cases and less MPG
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Post by jwalz1 on Apr 15, 2013 15:23:37 GMT -5
These Chinese scooters and other scooters have the worst fuel filters out there. The ethanol eats them away so your getting full gumming of the carb and other objects into the engine. This mr gasket fuel filter is a micro fuel filter that goes directly into the electric fuel pump and its made for CARS so it can handle the ethanol additives and what not gumming up your engine. Seafoam costs about 20 bucks a bottle then you taking off your carb to deal with sticking of jets or damages of sticking due to the carb while riding long term sucks. You can keep pouring seafoam at 20 bucks a bottle in each month if you want. Okey dokey, an upgrade to a better part is an upgrade to a better part, but unless the Chinese fuel filter is made out of rubber the ethanol is not going to eat it. The varnish that occurs when fuel dries in the carb is from the ethanol itself and not from something getting through the filter. In other words, even if you use this filter, you are going to need something to deal with the varnish issue eventually, and that would be a fuel additive. A squirt of techron per tank once a season, and running the tank completely dry for winter storage will do more to fight gumming than the filter will do, but I grant you, it is a better filter. I run a supercharged Honda S2000 and as super reliable as Honda's are, the car comes with no fuel filter from the factory outside of a piece of metal screen inside the tank at the fuel pickup. It is not carbed, but ethanol could still produce the same gum on the injectors as it would in a carb and Honda did not seem to think any filter would help because it is detergents is gas or additives that will address gum and varnish. If you like the upgrade, fantastic, but it is overkill on a scooter and won't prevent gum and varnish. If it helps the scooter idle better, great. |
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Post by bvance554 on Apr 15, 2013 18:19:44 GMT -5
Quit talking nonsense. Ethanol does not 'eat' fuel filters. I just checked mine and its still there after sitting in 10% ethanol for 2+ years. Its made of paper. Alcohol doesn't eat paper. And another thing, ethanol doesn't 'contain corn additives.' Its alcohol made from corn.
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Post by tinstar on Apr 17, 2013 13:47:54 GMT -5
Seafoam!  |
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