I'm pretty sure I was the first to present the carburetor puking problem on this site (that was way before there were 10k members). A lot has been posted about it since then. Well I removed the pump well before this summer and the bike has not puked since! I always thought it was the pump and I feel this is proof positive. The bike runs great with out it. Looks good too.

dont need the pump,even with the stock needle/seat my bike ran great without it..it used to puke until i rejetted and it never did it again.. i had no idea why gas was pouring out of my carb until i found this site..if the fuel level is high and the gas expands from heat during shutdown it forces its way out of the air jet...and the fuel pump pressure behind that must force out even more fuel..a grizzly valve and the correct float level is the ticket for me..imho..

thebru wrote:
I'm pretty sure I was the first to present the carburetor puking problem on this site (that was way before there were 10k members). A lot has been posted about it since then. Well I removed the pump well before this summer and the bike has not puked since! I always thought it was the pump and I feel this is proof positive. The bike runs great with out it. Looks good too.
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FYI,its not the fuel pump,my 06 R* and my friends R* both puked fuel with ign off\ & without the fuel pump being on post hot shutdowns.

The reason why your bike stopped puking fuel is simple,its because when you go pumpless removing all that crap from left side of the bike opens up a lot more area for better cooling espcially inbetween the cyls when the metal fuel line thaat runs inbetween them that only has 1 layer of insulation on it from factory that isnt near enough to keep fuel cool in metal fuel line doesnt overheat anymore due to the increased colling capacity.

The bikes puck because the fuel gets overheated(e10% ethenol fuel is worse yet) esp 1-5 mins post hot shutdown and when thaat happens the fuel is boiled into a gas/steam like state .

Then when in a gas stat the pressure is increased in the fuel line /system and then the needle and seat cant hold back the additional pressure in fuel system and pukes fuel out/floods float chamber of carb with fuel.

And the metal float bowl also gets overheated too addiong to the issue but if running BAK that helps that side cool better too.

Sometimes when the metal fuuel line between cyls & carb are on the edge temp wise of pucking fuel but not puking yet its then when you turn on thre ign to refire bike post filling up with fuel when elef f-pump comes on inc fuel psi a bit that it then pukes fuel.

Thats why people think the elec f-pump is the direct cause of puking fuel when its really not ,many R*'s dont have to have the f-pump on at all to puke fuel ,it totally a overheating issue of fuel system thats noto properly insulated from heat from mfg thats the issues.

BTW,i left my bike stock and took approx 1-1.5hrs/$20 to properly insualte metal fuel line between cyls and carb/float bowl too and my bnikes puking fuel 4 of evry 5 times shutdown stopped ,even in 100+ deg temps i rode in this past summer. Did the same for my friends stock 05 R* that still has elec f-pump in stock location & it stopped puking fuel too.

So thats the reason your bike stopped puking fuel.

Scott

HI Guys,

I have an 05 with a Forcewinder air kit and a K&N filter I also have a fuel pu,p, I rode this summer in 102 degree weather in stop an go traffic, it was a major traffic snarl on the beach, you could walk faster that you could drive, and I have yet to have any carb puke issues, from what I can see it looks as though someone installed a heat shield over the back side of fuel pump and insulated the fuel line.

What I see behind the fuel pump is a piece of leather that separates the pump from the heat of the engine, the fuel line also looks as though someone insulated it with something that appears to be the color of duct tape.

Does anyone Else have a leather heat shield behind their fuel pump?

Dennis

thebru wrote:
I'm pretty sure I was the first to present the carburetor puking problem on this site (that was way before there were 10k members). A lot has been posted about it since then. Well I removed the pump well before this summer and the bike has not puked since! I always thought it was the pump and I feel this is proof positive. The bike runs great with out it. Looks good too.

Totally agree with you bru, when all that gas in the fuel line heats up, it has no where to go but into the float bowl, with the pump removed, it can expand and go back into the tank..is the pump the cause, no but taking it off is a good cure...

thebru wrote:
I'm pretty sure I was the first to present the carburetor puking problem on this site (that was way before there were 10k members). A lot has been posted about it since then. Well I removed the pump well before this summer and the bike has not puked since! I always thought it was the pump and I feel this is proof positive. The bike runs great with out it. Looks good too.
I'm glad someone finally figured how why this was happening and how to fix it

Im sure the pump is not to blame,but if it maintains pressure it is going to send that remaining fuel out thru the carb if it starts to puke..i have just regular auto fuel line going to the carb from the tank..the steel tubing would draw heat so i removed it.. i keep the fuel line suspended in air and away from any contact with the heads..the float bowl is shallow and it wouldnt take much to overheat it..by opening up the left side of the motor and removing the ais crap i have plenty of airflow to the carb and the rear jug..and it looks better to me... Mike M

Flashback wrote:
thebru wrote:
I'm pretty sure I was the first to present the carburetor puking problem on this site (that was way before there were 10k members). A lot has been posted about it since then. Well I removed the pump well before this summer and the bike has not puked since! I always thought it was the pump and I feel this is proof positive. The bike runs great with out it. Looks good too.

Totally agree with you bru, when all that gas in the fuel line heats up, it has no where to go but into the float bowl, with the pump removed, it can expand and go back into the tank..is the pump the cause, no but taking it off is a good cure...

IMHO, Flashback is right on the money. There's still a lot of heat in there, but without the pump, it has somewhere else to go besides out the carb.

Ratl.

This is a case where posting and sharing ideas and solutions have saved grief (and burnt bikes) for a lot of us. Thanks to Bru and the early weekend engineers for pioneering.

Even with my pump relo'ed under the right cover I got puking on the hottest most humid days here in NC. However, I also still had the stock intake so there was likely still lot's of heat trapped inside the V roasting the gas in the lines and bowl. I agree that with the pump or likely with any line obstruction forcing expanding fuel the direction of the carb that puking is likely imminent (then add the pressure goals of the pump then the issue get's exaggerated).

I have since also gone with the Forcewinder intake and have gone pumpless and expect the issue to be resolved. If it returns next Spring/Summer I'll add line and bowl insulation to the mix but I should be golden now.

BTW,plenty of people have complained about carb puke with many theories on what causes it most of which was the elec f pump causing it (which isnt the case ) with no real solid info and or solid fix for carb puke that worked each time untill i nailed it after my diagnostic work for my 06's carb puke issues and came up with a fix for it last yr which i posted here in RSC trying to help fellow RSC memebers fix thier carn puke too . It wanst accepetd that well here either but thats not my loss as my bikes carb puke has been history since i did my fix last yr so not more puke even in 100+ HHH temps.

Over the past yr or so i have been a member here in RSC i was the 1st RSC member to offically post here in RSC how/why carb puke happens (for sure!) and what the fix is after successfully doing that fix i came up with on my bike and a friends R* too. My fix was 100% successfull in both cases thats especially good for when people want to retain the elec f-pump in stock location along with lrg stock aircleaner that unfortuantely significantly reduce airflow/reducing cooling efficency overheating metal fuel lines/carb etc causing carb puke.

I have also had more successes with my carb puke fix when a few other RSC members tried my fix.

As i stated earlier carb puke is all about overheating the fuel line/carb etc that when heats into gas/steamlike state overpowering the needle & seats abilty to hold back the pressure flooding the carb float bowl with fuel which i had posted here many times last yr when i posted the fix for carb puke on my 06 silverado . My fix is to dbl/tripple insulate the metal fuel line inbetween cyls ,the float bowl,and even some of the main body of carb where you can acess it inbetween throttle cables etc which stopped my bikes carb puke & on my friends 05 R* too.

I could actually hear ther fuel in the float bowl on my bike boiling like heck a couple mins post hot shutdown just before it would puke fuel all over the hot motor sizzling/smoking a little white cloud like it was very close to flashpoint & was going to ignite any second if the motor was a couple deg hotter when the fuel hit it.

But when you modify the bike removing the stock fuel pump & fuel filter assembly thats on left side of bike blocking airflow inbetween cyls and also remove the the very lrg stock air cleaner on right side & install asmaller aftemarket aircleaner doing that opens things up(esp for more air flow inbetween cyls from both sides) for much better airflow/cooling and that's why carb puke stops for some people when just reloacting the elec f-pump,going pumpless,and when also going to a smaller aftermarket air cleaaner.

So when people replocate the fuel pump etc and carb puke stops they think it was f-pump itself causing carb puke when in fact it was poor airflow/poor cooling/poor insualting of fuel system from mfg that was allowing the fuel to overheat into a gas state that is the real issue. But when you relocate/change things that increase cooling efficinecy doing that stops overheating the metal fuel lines/metal carb thus ending carb puke.

Scott