Fuel issues

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Fuel issues

Postby Yamiboob » Thu Feb 08, 2018 1:02 pm

For starters I have a 03 yzf600r. Has full new ignition system including ecu. New stator, rectifier, battery and NEW FUEL PUMP. the issue I'm having with the bike is once it gets up to temp at stop lights and such (100c°) the fuel pump starts pumping very fast, like it has no fuel and the bike begins to run poorly like it's running out of gas. Forgot to mention I have a very clean tank, brand new fuel lines and aftermarket inline filter. And cleaned in tank filter. cleaned and synced carbs. If I disconnect the fuel line from the pump to the tank I get plenty of fuel flow from the tank even with the cap on. I'm stumped. Sometimes it gets so bad the bike will die from lack of gas. Sometimes it works perfectly and you can hear and feel with your hand the pump clicking every few seconds like it should and the bike will run proper. Even with the gas cap open I can re create the problem. Bike will run perfect until out of gas if you use an IV bag type set up and run gas straight to the carbs from a tank off and higher than the bike. Any ideas? Thanks a lot. Im new here.
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Re: Fuel issues *UPDATE*

Postby Yamiboob » Sun Feb 11, 2018 9:42 pm

Now the fuel pump never stops pumping even with fuel in the fuel filter. But it somehow never gets enough fuel into the carbs to run right.
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Re: Fuel issues

Postby Riceburner » Sun Feb 11, 2018 11:12 pm

Blockage between the fuel filter and carbs? or the line is kinked/pinched?
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Re: Fuel issues

Postby Micah » Mon Feb 12, 2018 1:45 am

Possible electrical short to the fuel pump?
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Re: Fuel issues

Postby Yamiboob » Mon Feb 12, 2018 3:12 pm

All wiring has been inspected closely. Brand new fuel lines all the way around on top of new in line filter and freshly cleaned carbs. Never has been run without a filter. Also with the tank mounted high where you can see the perfectly straight fuel lines with no kinks the problem is still persistent.
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Re: Fuel issues

Postby Yamiboob » Mon Feb 12, 2018 3:15 pm

Went ahead and ordered a second fuel pump since they are cheap. Will see what happens on the 4th
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Re: Fuel issues

Postby tuning-forks » Mon Feb 12, 2018 5:42 pm

I take it the filter is between the tank and pump like the stock unit.
Disconnect the line going in to the pump. Do you get good flow? I'm sure it's possible they could get the arrow mark (or 'in' marking) backwards on the filter.
If you have good flow from the filter, reconnect the 'in' line to the pump and disconnect the 'out' from the pump. Do you get good flow out of the pump when the pump is running?
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Re: Fuel issues

Postby Micah » Mon Feb 12, 2018 5:44 pm

That's truly odd. I'm hoping (as I am sure you are) that the new pump fixes the issue. I don't recall ever reading any other issue similar to what you described.
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Re: Fuel issues

Postby Yamiboob » Mon Feb 12, 2018 6:39 pm

Tuning forks. Yes the filter is in between the tank and pump. It gets perfect flow to the pump if unplugged, it also gets more gas than it could ever use if you unplug the line from the pump to the carb. Micha. I've worked on all kinds of bikes for 5 years and have never had or heard of such a problem either.
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Re: Fuel issues

Postby Riceburner » Mon Feb 12, 2018 8:56 pm

Yamiboob wrote:Went ahead and ordered a second fuel pump since they are cheap. ...


cheap?.....aren't they almost $200?
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Re: Fuel issues

Postby Yamiboob » Mon Feb 12, 2018 10:33 pm

$16
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Re: Fuel issues

Postby Riceburner » Tue Feb 13, 2018 1:11 am

Fuel Pump Comp
4TV-13907-00-00
$183.43


Where are you getting one for $16?
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Re: Fuel issues

Postby Yamiboob » Tue Feb 13, 2018 9:20 am

eBay lol. People say it works just as good. A 99-02 r6 fuel pump will work too. Also around $16
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Re: Fuel issues

Postby Riceburner » Tue Feb 13, 2018 2:21 pm

big price difference....

R6 FUEL PUMP COMP.
5EB-13907-01-00
$379.99 to $267.95

Gotta wonder about those e-bay ones. Should be a simple item.
https://www.ebay.ca/itm/12V-1-0A-New-Fu ... 6G&vxp=mtr
Last edited by Riceburner on Tue Feb 13, 2018 2:28 pm, edited 1 time in total.
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Bike Mileage: 19k+ km
Bike Mileage: 118k+ km

Re: Fuel issues

Postby Yamiboob » Tue Feb 13, 2018 2:27 pm

https://m.ebay.com/itm/FUEL-PUMP-FITS-Y ... SwPe1T82t8


https://m.ebay.com/itm/FUEL-PUMP-FITS-Y ... SwPe1T83yP

I like the r6 pump better do to the curved inlet and outlet. Ordered the one for my bike though.
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Re: Fuel issues

Postby Pepperoni » Wed Feb 14, 2018 7:28 pm

I went the Ebay cheapo pump route. There's a ton of these for sale, they are mostly the same but check the photos carefully. The one difference is that this has a "leak valve" (the black nipple) that you'll be able to tell when the diaphragm fails...'cuz it'll leak out of the little fitting (that shouldn't happen for 10s of thousands of miles). It says 10mm fittings. I changed my hoses to generic fuel line (they were old and broke apart when doing the repair) that was *supposed* to fit but it was incredibly hard to get the new hoses on to the new pump and even harder to get the hose clamps seated. I don't know if I got the wrong inner diameter hose material of the fittings are larger than stated.

https://www.ebay.com/itm/10MM-Outlets-Electric-Fuel-Pump-NEW-for-Honda-Kawasaki-KTM-Yamaha-Carbureted-/231290269628?hash=item35d9f96fbc

Image
(sorry about the image size)

It worked great but it seemed to always be pumping/clicking (but not flooding the carbs).

It lasted about 6 months.

HOWEVER: it had a warranty! It was a bit of a hassle, but I got the seller to send me the replacement They wanted me to send them the bad one first before they'd send a replacement but eventually offered the replacement if I'd send them photos of the bad one smashed up (in obvious unusable condition). I didn't want to mail it back because of gas and gas fumes. Also, while they seem to be in California, they are probably in Hong Kong or China because of the huge time delay in responding to email.

Long story short:

They sent the replacement and it seems to work correctly, NOT pumping/clicking after that initial couple of seconds after turning the ignition to "ON" and obviously pumping while the engine is running.

YMMV.

Yeah, there's a REPUTABLE replacement made by K&L but that'll cost about $125-150. There's no valid reason to pay Yamaha over $200 for the "real" part.
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Re: Fuel issues

Postby Yamiboob » Thu Feb 15, 2018 11:30 pm

Good to know. I wondered what that nipple was for. 17 hours till pump comes. Impatently waiting.
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Re: Fuel issues

Postby Pepperoni » Fri Feb 16, 2018 1:18 am

It's super easy and you can probably do it just by loosening the front tank bolt, removing the rear bolt, and just propping up the tank without disconnecting all of the non-fuel lines. Good luck.
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Re: Fuel issues

Postby Yamiboob » Sat Feb 17, 2018 8:58 pm

Alright so fuel pump came a day late. I put it on, checked the fuel lines and blew them out, primed the filter and hooked it up to the tank. Opened the gas cap, turned the key and the bike primed like normal until it got pressure. I turned the bike on and off again a few more times till it wouldn't pump anymore due to complete pressure. Again gas cap still open, started the bike and let it idle for 5 minutes. pump would click every few seconds as needed. Pump slowly sped up and idle increased do to lack of gas. I checked the filter and it had about zero fuel in it. What the f*** and yes the on off valve is on. If anyone is able to help me with this it would be greatly appreciated.
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Re: Fuel issues

Postby Pepperoni » Sat Feb 17, 2018 9:40 pm

Well, you said in the original post "And cleaned in tank filter..." If you really unbolted that from the tank and cleaned it out (that was the one thing I couldn't figure out last time I had fuel problems and it cost me a ton of money at a shop), did you also clean out the petcock? (Not sure what there is if anything to clean with that). You've checked the fuel line from the petcock to the new fuel filter? Is it also unkinked and NOT being crushed against that horizontal frame member (situated below the rear tank mount)?

If so, then I can tell you for sure that I have no idea and you should read the comments by people who actually know even more about this than I do. :dunno :doh
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