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Thread: HOW TO CHECK FUEL PUMP VAPOR LOCK FOR '06 RAPTOR 700

  1. #1
    KUNG FU SAND PANDA JOHNNY BAJA's Avatar
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    HOW TO CHECK FUEL PUMP VAPOR LOCK FOR '06 RAPTOR 700

    Vapor lock on the '06 Yamaha Raptor 700's has been a common problem.

    Symptom: Intermittent “hard starting” when the engine is hot, usually occurring 5 – 10 minutes after shutting the engine off. Most commonly reported in the Northeastern regions and desert.

    Cause: The seasonal gasoline in these areas has lower vapor pressure and subsequently lower boiling point then fuel commonly found in other regions. This allows bubbles to collect in the fuel pick-up tube, causing the pump to temporarily cavitate or vapor lock. The pump will usually prime after several minutes and operate normal again.

    Remedy: The fuel-vapor bleed hole was enlarged on mid production units to prevent vapor build up. If you experience a similar compliant, replace the fuel pump with FUEL PUMP COMP. (P/N:1S3-13907-02-00) which has a 0.8 mm bleed hole.

    To identify which fuel pump you have you will need to follow the following procedure.

    First remove your seat, then you will need to remove the two (2) plastic screws that hold the bottom gas tank cover down.


    Next remove the two (2) allen head screws that hold your hood on and remove hood.


    Next remove your gas cap and slide your gas tank cover off and reinstall gas cap. Here you will be able to see the fuel pump on the top of your gas tank.


    You will have to look very close at the middle of your fuel pump to read you fuel pump part number. Remember, if you have any other number besides P/N 1S3-13907-02-00 you have an early production Raptor and have the faulty fuel pump. I penciled over the part number so you know what to look for.




    Below is a factory Yamaha service bulletin on the fuel pump problem.

    Last edited by JOHNNY BAJA; 07-02-2008 at 09:19 PM.

  2. #2
    Master Modder DL700's Avatar
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    Quote Originally Posted by JOHNNY BAJA View Post
    REPORT COMING
    ive never seen this problem on my early model 2006, but have heard it was do to the very low boiling point of winter gas in the colder states

  3. #3
    Modding the Motor 700Rappy's Avatar
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    when taking off fuel cap...the gas seems to be "boiling" this is actually from pressurized air...when you take the cap off the vapour finally has somewhere to go...on my 06 700 my vent hose was plugged with mud after fixing this i have never had another problem...some say its a problem with the check valve on the gas cap itself...a quick fix to that is to get a 660 gas cap...btw...i do have the problem fuel pump..but have had zero problems...
    2006 700r
    Pro Circuit Ti4 Exhaust
    Cobra Fi2000r fuel controller
    Custom Made Tephlon Case Saver
    15t Renthal
    Velocity Air Intake Kit
    Crj +2.5 Wheel spacers
    ITP holeshot HD's rear
    ITP Holeshot STD on C series rims
    DG Front Bumper
    DG 6 pack rack
    Motosport Nerf bars
    Fly Bars

  4. #4
    R.I.P. Coop SEVEN00's Avatar
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    Exclamation

    Quote Originally Posted by 700Rappy View Post
    when taking off fuel cap...the gas seems to be "boiling" this is actually from pressurized air...when you take the cap off the vapour finally has somewhere to go...on my 06 700 my vent hose was plugged with mud after fixing this i have never had another problem...some say its a problem with the check valve on the gas cap itself...a quick fix to that is to get a 660 gas cap...btw...i do have the problem fuel pump..but have had zero problems...
    Me too and when it was new, it did all that! Now... I have Zero, Nada, Zip issues!
    You want a piece of me, well do ya punk?

  5. #5
    Master Modder AL2FAST's Avatar
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    I got vapor lock on mine after a big mud hole on my 2nd ride. Man, was I pissed! Finally cracked the gas cap as a last ditch resort and she fired right up. I just took that long hose off the stock cap and put one of the $7 breathers from Rocky Mountain on and have had no issues since.
    06 700R With a couple stickers. It has so much power, It can spin the tires

  6. #6
    Master Modder AL2FAST's Avatar
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    Update, went riding last weekend and I had gas coming out of my breather cap on my gas cap. It was actually hot enough that my cooling fan turned on, lot of slow, climbing over obstacles trail riding. Lots of 1st & 2nd gear. It started hard on me once. Must have had some shitty gas, I was running 87 Shell gas, I use to run 93, but after doing more research, found there was no benefit on my stock compression motor.

    Is it possible that higher octane would help prevent this or does the octane rating have no effect on the vaporization properties that seem to cause these problems.

    Also, does Yamaha pay for the new fuel pump or would I have to if I have the bunk one?
    06 700R With a couple stickers. It has so much power, It can spin the tires

  7. #7
    KUNG FU SAND PANDA JOHNNY BAJA's Avatar
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    Unless you have an extended service plan, I think that you might have to pay for it. You'll need to call your local Yamaha dealership to be sure.

    Did you check to see if you have the newer fuel pump yet?

    Also, I don't think that your cooling fan coming would have anything to do with the gas coming out of your breather cap. I would think that the cooling fan came on because you were climbing hills in low gears and since you didn't have enough air flowing over the radiator the engine got hot and thats what turned your fan on.

    Maybe someone else could add to this and help you diagnose whats going on.

    -Johnny

  8. #8
    Master Modder AL2FAST's Avatar
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    I'm gonna call the stealership tonight if I get home in time to verify my model # on my fuel pump before they close. I bought mine used with the remainder of a 3 year extended service plan that the original owner bought for it.

    I only mentioned the cooling fan coming on because this is only the 2nd time I can remember it coming on. The last time this happened it was an 85 degree day and 90% humidity.

    I just wasn't sure if the gas has possibly contributed to this problem as well. Summer in WI means a ton of humidity when it warms up, no such thing as dry heat here, so I don't know how much the elements and gas choice for the day may or may not have contributed to my vapor lock & gas coming out of my breather hose the second half of the day.

    I'll update tonight, plus my new rear brakes are supposed to be here too
    06 700R With a couple stickers. It has so much power, It can spin the tires

  9. #9
    Bolt-on Beginner Hardluckhero's Avatar
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    This happened to me on 2 occasions in Spring of '07. Once at Martinez Mine and the other at Queen Valley in AZ. The problem is the temp here was tickling triple digits and the Winter gas blend was still being distributed. I always use 91 octane.
    Once I read the service bulletin from Yamaha and saw the price of the new fuel pump, I decided to use a .8mm drill bit and increase the size of the vapor bleed hole. Haven't had issues since.

    It was an uneasy feeling when it first happened since I was about 28 miles from my truck.
    Last edited by Hardluckhero; 07-09-2008 at 12:45 PM.

    06 Raptor 700
    05 YZ250

  10. #10
    Master Modder AL2FAST's Avatar
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    I'm gonna check the model # tomorrow. Did the rear brakes tonight, took me 3 hrs,

    FYI- If you do that, the piston goes in REAL easy when you remove the parking brake assy from the caliper, otherwise doesn't go in nearly far enough!
    06 700R With a couple stickers. It has so much power, It can spin the tires

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